Merge branch 'main' into hanif/preview-drag-detail

Hide Infill in the Shell Drag Mode Only Where the Profile Covers It
A profile with no top or bottom shell layers, or no walls, leaves the infill on the surface, so hiding it changed the picture. The viewer now reads the print's default region settings when it loads a print and leaves the infill in place for such a print; per-object overrides are not consulted.
2026-09-30 20:31:09 +00:00 · 2026-09-29 16:14:34 +08:00 · 2026-09-28 17:10:54 +08:00 · 2026-09-28 17:10:54 +08:00 · 2026-09-28 17:10:54 +08:00 · 2026-09-28 16:20:11 +08:00
127 changed files with 1953 additions and 4364 deletions
@@ -189,7 +189,8 @@ the presets to a base is in [shared-bases.md](shared-bases.md#variant-arrays-on-
 2. Every key in `filament_options_with_variant` ([the full list](#the-four-key-sets)) that reaches the
   preset, whether written, included or inherited, is resized to its variant count: write it at exactly
   that width, or leave it out. Keys outside the set
-   (`filament_type`, plate temperatures, `fan_max_speed`, `slow_down_min_speed`, …) are never addressed by variant index; the preset contributes their first value however wide a
+   (`filament_type`, plate temperatures, `fan_max_speed`, `slow_down_min_speed`, `pressure_advance`,
+   …) are never addressed by variant index; the preset contributes their first value however wide a
   file writes them.
 3. Cover every variant the material is meant to print on across its `compatible_printers`. Leave out
   a variant deliberately when the material should not be tuned for it (e.g. a TPU High Flow variant
@@ -454,7 +455,7 @@ no set: the variant-length resize leaves it alone, and only the pair rebuild of
 last for contrast; it is not a variant set.

 `check` and `fix-variant` read the four sets from `PrintConfig.cpp` on every run, so they follow the
-engine. The lists below are from the 2026-09-29 checkout; regenerate them from the repository root
+engine. The lists below are from the 2026-09-25 checkout; regenerate them from the repository root
 before relying on them (the recipe strips comments, since an initializer can carry a commented-out entry):

 ```bash
@@ -477,7 +478,7 @@ EOF

 **`print_options_with_variant`**, process, stride 1 (45): `bridge_acceleration`, `bridge_speed`, `default_acceleration`, `default_jerk`, `default_junction_deviation`, `enable_overhang_speed`, `gap_infill_speed`, `infill_jerk`, `initial_layer_acceleration`, `initial_layer_infill_speed`, `initial_layer_jerk`, `initial_layer_speed`, `initial_layer_travel_acceleration`, `initial_layer_travel_jerk`, `initial_layer_travel_speed`, `inner_wall_acceleration`, `inner_wall_jerk`, `inner_wall_speed`, `internal_bridge_speed`, `internal_solid_infill_acceleration`, `internal_solid_infill_speed`, `outer_wall_acceleration`, `outer_wall_jerk`, `outer_wall_speed`, `overhang_1_4_speed`, `overhang_2_4_speed`, `overhang_3_4_speed`, `overhang_4_4_speed`, `print_extruder_id`, `print_extruder_variant`, `slowdown_for_curled_perimeters`, `small_perimeter_speed`, `small_perimeter_threshold`, `sparse_infill_acceleration`, `sparse_infill_speed`, `support_interface_speed`, `support_speed`, `top_solid_infill_flow_ratio`, `top_surface_acceleration`, `top_surface_jerk`, `top_surface_speed`, `travel_acceleration`, `travel_jerk`, `travel_speed`, `travel_speed_z`

-**`filament_options_with_variant`**, filament, stride 1 (54): `activate_air_filtration`, `activate_air_filtration_during_print`, `activate_air_filtration_on_completion`, `adaptive_pressure_advance`, `adaptive_pressure_advance_bridges`, `adaptive_pressure_advance_model`, `adaptive_pressure_advance_overhangs`, `complete_print_exhaust_fan_speed`, `during_print_exhaust_fan_speed`, `enable_pressure_advance`, `filament_adaptive_volumetric_speed`, `filament_cooling_before_tower`, `filament_deretraction_speed`, `filament_extruder_variant`, `filament_flow_ratio`, `filament_flush_temp`, `filament_flush_volumetric_speed`, `filament_ironing_flow`, `filament_ironing_inset`, `filament_ironing_spacing`, `filament_ironing_speed`, `filament_long_retractions_when_cut`, `filament_max_volumetric_speed`, `filament_pre_cooling_temperature`, `filament_pre_cooling_temperature_nc`, `filament_preheat_temperature_delta`, `filament_ramming_travel_time`, `filament_ramming_travel_time_nc`, `filament_ramming_volumetric_speed`, `filament_ramming_volumetric_speed_nc`, `filament_retract_after_wipe`, `filament_retract_before_wipe`, `filament_retract_length_nc`, `filament_retract_length_toolchange`, `filament_retract_lift_above`, `filament_retract_lift_below`, `filament_retract_lift_enforce`, `filament_retract_restart_extra`, `filament_retract_restart_extra_toolchange`, `filament_retract_when_changing_layer`, `filament_retraction_distances_when_cut`, `filament_retraction_length`, `filament_retraction_minimum_travel`, `filament_retraction_speed`, `filament_wipe`, `filament_wipe_distance`, `filament_z_hop`, `filament_z_hop_types`, `long_retractions_when_ec`, `nozzle_temperature`, `nozzle_temperature_initial_layer`, `pressure_advance`, `retraction_distances_when_ec`, `volumetric_speed_coefficients`
+**`filament_options_with_variant`**, filament, stride 1 (48): `activate_air_filtration`, `activate_air_filtration_during_print`, `activate_air_filtration_on_completion`, `complete_print_exhaust_fan_speed`, `during_print_exhaust_fan_speed`, `filament_adaptive_volumetric_speed`, `filament_cooling_before_tower`, `filament_deretraction_speed`, `filament_extruder_variant`, `filament_flow_ratio`, `filament_flush_temp`, `filament_flush_volumetric_speed`, `filament_ironing_flow`, `filament_ironing_inset`, `filament_ironing_spacing`, `filament_ironing_speed`, `filament_long_retractions_when_cut`, `filament_max_volumetric_speed`, `filament_pre_cooling_temperature`, `filament_pre_cooling_temperature_nc`, `filament_preheat_temperature_delta`, `filament_ramming_travel_time`, `filament_ramming_travel_time_nc`, `filament_ramming_volumetric_speed`, `filament_ramming_volumetric_speed_nc`, `filament_retract_after_wipe`, `filament_retract_before_wipe`, `filament_retract_length_nc`, `filament_retract_length_toolchange`, `filament_retract_lift_above`, `filament_retract_lift_below`, `filament_retract_lift_enforce`, `filament_retract_restart_extra`, `filament_retract_restart_extra_toolchange`, `filament_retract_when_changing_layer`, `filament_retraction_distances_when_cut`, `filament_retraction_length`, `filament_retraction_minimum_travel`, `filament_retraction_speed`, `filament_wipe`, `filament_wipe_distance`, `filament_z_hop`, `filament_z_hop_types`, `long_retractions_when_ec`, `nozzle_temperature`, `nozzle_temperature_initial_layer`, `retraction_distances_when_ec`, `volumetric_speed_coefficients`

 **`printer_extruder_options`**, machine, one value per extruder, not a variant set (8):
 `default_nozzle_volume_type`, `extruder_max_nozzle_count`, `extruder_printable_area`,
@@ -244,10 +244,10 @@ preset for a 0.2 nozzle, explicitly revisit flow limits; do not infer a pressure
 required direction of change, from diameter alone.

 On a printer with extruder variants, a filament tunes these per variant too:
-`filament_max_volumetric_speed`, `filament_flow_ratio`, `nozzle_temperature`, pressure advance and the
-retraction overrides carry one value per variant of `filament_extruder_variant` (Standard, High Flow, …). The
+`filament_max_volumetric_speed`, `filament_flow_ratio`, `nozzle_temperature` and the retraction
+overrides carry one value per variant of `filament_extruder_variant` (Standard, High Flow, …). The
 exact key set is [`filament_options_with_variant`](extruder-variants.md#the-four-key-sets);
-`slow_down_min_speed` and `fan_max_speed` are not in it. Keep every such array at exactly that width, even where the
+`slow_down_min_speed` and `pressure_advance` are not in it. Keep every such array at exactly that width, even where the
 setting does not differ per variant, and measure the High Flow variant rather than copying Standard
 ([extruder-variants.md](extruder-variants.md#filament)).

@@ -146,7 +146,7 @@ jobs:
                "repos/${{ github.repository }}/actions/workflows/post_merge_profiles.yml/runs" \
                -f branch="$branch" -f event=workflow_dispatch -f per_page=100)"
              run_id="$(jq -r --arg marker "[OFL cron $dispatch_id]" \
-                '[.workflow_runs[] | select((.display_title // "") | contains($marker))]
+                '[.workflow_runs[] | select((.display_title // "") | contains($marker))] \
                | sort_by(.created_at) | last | .id // empty' <<< "$runs_json")"
              [ -n "$run_id" ] && break
              sleep 5
@@ -0,0 +1,80 @@
+# G-code preview while dragging
+
+The sliced preview draws every toolpath segment of the plate as an instanced box. On a large
+plate that is tens of millions of segments, and the frame is GPU-bound: the cost is the number of
+instances drawn, not anything the CPU does per frame. Dragging the camera over such a plate cannot
+keep up. The `preview_reduced_detail_mode` preference (*Graphics > G-code Preview*, off by
+default) lets the preview draw less while the user drags and put the full toolpaths back when they
+let go.
+
+| Preference | Values | Effect |
+|---|---|---|
+| `preview_reduced_detail_mode` | `off`, `solid`, `shell` | what is drawn while dragging |
+
+libvgcode (`src/libvgcode`) builds and binds the reduced toolpath set, `GCodeViewer` maps the
+preferences onto it and draws the solid model, and `GLCanvas3D` decides when the user is dragging.
+The OpenGL ES path keeps a single set and ignores the preference.
+
+## Two sets, one walk
+
+`ViewerImpl::update_enabled_entities()` walks the visible vertex range once and fills two segment
+index buffers side by side: the **full** set and the **reduced** set (segments and options).
+Building them together is what makes switching free: starting or ending a drag is a buffer
+binding, never a rebuild. A change of mode does rebuild. Nothing is built while the mode
+is off, and the reduced buffers are then uploaded empty so that the last set does not stay
+allocated.
+
+Whatever the mode leaves out, the bottom and top layers of the visible range are kept whole: they
+are the faces the range cuts open, and the top is what the user is looking at.
+
+### Modes
+
+- `EndLayersOnly` (`solid` in the preference) keeps only the two end layers. `GCodeViewer` then
+  draws the sliced objects and the prime tower as opaque solids, see below.
+- `ShellOnly` (`shell`) keeps every role but the sparse infill, internal solid infill, internal
+  bridge infill and gap fill, which lie under the skins or between the walls. Walls, top and
+  bottom surfaces, bridges, supports and the prime tower are drawn whole, so from outside the
+  print looks as it does at rest. The roles come from
+  the slicer, so the classification is exact wherever the slicer's is; what it cannot express is
+  the inside of the prime tower and of a support, which share one role with their outside and are
+  kept whole. A profile with no top or bottom shell layers, or no walls, leaves the infill on the
+  surface, so `GCodeViewer` turns the hiding off for such a print when it loads it, from the
+  print's default region settings; per-object overrides are not consulted.
+
+## The solid model
+
+The preview already loads the sliced objects as shells for its translucent ghost.
+`GCodeViewer::render_solid_model()` draws those shells opaque, in their filament colors, with the
+`gouraud` shader, whose z range cuts them to the visible layer range. The two toolpath layers of
+the reduced set are drawn afterwards and cap the cut with what was really printed there. The
+shells hold only the objects, so while this mode is on the prime tower is added from its sliced
+mesh, positioned as the print placed it. It is added or removed on its own when the mode changes,
+without reloading the objects, keeps its opaque color so that it never appears among the
+translucent shells, and stays out of their bounding box. Supports have no mesh and are not shown,
+and `load_shells()` drops every non-model-part volume, so a negative volume is not cut out.
+
+A plate whose shells are not loaded keeps drawing toolpaths, since the solid model would leave
+only the end layers.
+
+## Deciding that the user is dragging
+
+`GLCanvas3D::_update_preview_interaction()` runs at the top of every preview frame, before the
+canvas decides whether to reuse its cached scene, so that the switch lands in that frame. Dragging
+is `GLCanvas3D::is_user_interacting()`, the same answer the scene cache reads: the camera, the
+navigator, a gizmo, the rectangle selection or either slider being held. A slider reports this from
+ImGui's active id rather than its dirty flag, which is raised and consumed inside one frame. A
+wheel step has no duration, so it holds the reduced set for a 150 ms settle time instead, and the
+frame that restores the toolpaths is scheduled for when that time runs out, since the render timer
+only wakes the idle loop. A drag cut short by focus or capture loss is ended explicitly, and a
+button release wakes the idle loop, because on some platforms nothing else would until the next
+input.
+
+## Reused scene frames
+
+`GLCanvas3D` keeps its last scene pass for frames that only rebuild the overlay (`SceneCache`). Its
+key covers the canvas size, the camera and hover state, not what the toolpath sets draw, so a frame
+that reuses the scene must never be one on which the set is switched.
+`_update_preview_interaction()` therefore reports whether the bound set changed, and a frame on
+which it did redraws the scene. The canvas neither captures nor reuses the scene while the user
+drags, so no reduced frame outlives a drag, and the frame that ends a wheel's settle time is
+requested as a full frame.
@@ -28,8 +28,8 @@ Per-vendor granularity is what makes the system practical:
 - A vendor whose profile is bumped invalidates only its own cache. The other 60-odd
  vendors keep theirs — even when the bumped vendor is the shared Orca filament
  library everyone else inherits from.
- The setup wizard loads its vendors through the same routine as startup, so it
-  gets the same speedup without a second code path.
+- The setup wizard, which loads vendors one at a time, gets the same speedup as
+  startup without a second code path.
 - A vendor with no cache, or a broken one, costs only that vendor a parse.

 A cache holds *system* presets only. User presets, project settings and modified
@@ -162,20 +162,15 @@ cache nothing can invalidate is worse than no cache.

 Vendors load in a fixed order, because filament inheritance crosses exactly one
 boundary: any vendor's filament may inherit from the shared Orca filament library,
-and nothing else reaches across vendors — an `include` is always vendor-local. Only
-installing a vendor's presets crosses it; reading the vendor, from its cache or its
-JSONs, needs nothing from the library. So every other vendor is read while the library
-loads, each is installed against it as soon as both are done, and the results are
-merged in a stable order:
+and nothing else reaches across vendors — an `include` is always vendor-local. The
+library therefore goes first, alone; every other vendor follows in parallel, resolving
+against it; and the results are merged in a stable order:

 ```mermaid
 flowchart LR
-    lib["1 · OrcaFilamentLibrary loaded;<br/>meanwhile every other vendor read<br/>from its cache or its JSONs"] --> par["2 · every other vendor installed<br/>in parallel, each into its own bundle,<br/>filaments resolving against the library"] --> merge["3 · bundles merged into one,<br/>in one pass per collection,<br/>in stable vendor order"]
+    lib["1 · OrcaFilamentLibrary<br/>loaded first, synchronously"] --> par["2 · every other vendor in parallel,<br/>each into its own bundle, filaments<br/>resolving against the loaded library"] --> merge["3 · bundles merged into one,<br/>sequentially, in stable vendor order"]
 ```

-`PresetBundle::load_vendors` runs these steps for startup and for the setup wizard,
-which hand it the vendors to load and the directory each is installed in.
-
 Whether a vendor comes from its cache or from a parse changes nothing in that
 order — both produce the same bundle, so cached and parsed vendors mix freely in
 one startup.
@@ -216,12 +211,11 @@ shipped cache answered first, so the profile in `<data_dir>/system/` was never p
 and its cache was never written back.

 Serving from a cache is not a memory-image restore. The entries are deserialized and
-then installed by `install_vendor`, the routine the JSON path hands the vendor's entries
-to once it has parsed the sub-files: inheritance resolved against the presets installed
-before them and the currently loaded filament library, includes layered in, configs
-flattened onto the collection defaults, validated and registered. An `include` layers
-what the included base states, between the parent and the preset's own keys: the base's
-diff against the
+then installed one by one — inheritance resolved against the presets installed before
+them and the currently loaded filament library, includes layered in, configs flattened
+onto the collection defaults, validated and registered — by the same function the JSON
+path calls straight after parsing a sub-file. An `include` layers what the included
+base states, between the parent and the preset's own keys: the base's diff against the
 default, taken when the base itself was installed and before the per-variant padding
 `inherits` sees, so only what a template sets reaches the presets including it. The two
 paths share everything below the parse, which is what makes a cache-loaded bundle
@@ -229,16 +223,6 @@ indistinguishable from a JSON-loaded one by construction rather than by test cov
 Installation also rebuilds each preset's file path from the local data directory, so a
 shipped cache never carries the generating machine's paths.

-Installing an entry is split in two. `resolve_vendor_preset` flattens it, reading only
-what is registered under the names it inherits and includes, and `commit_vendor_preset`
-registers it, the only step that writes anything shared. Entries resolve across threads
-in runs and commit in the order the vendor lists them. A run ends before an entry that
-inherits or includes one already in it, since that one's commit registers what the
-entry resolves against, so no entry in a run reads what another in it registers. An
-entry's parse messages are held until it commits. The bundle, the log's parse and
-install messages and the error count therefore come out as parsing and installing one
-entry at a time would leave them, whatever the listing order.
-
 App upgrades work because a cache normally survives one. Only a deliberate
 `CACHE_VERSION` bump makes an installed cache unreadable, and that is handled at
 install time rather than at load: a vendor whose cache this build cannot read counts
@@ -270,20 +254,17 @@ the wizard caches the *derived JSON*, not another form of the inputs:
 open, the wizard computes the current stamps (one version peek per vendor) and, when
 they match, serves the catalog from the file — no bundle built, no preset installed.
 Caching bundle inputs instead was tried and measured: rebuilding the bundle from
-per-vendor caches costs over a second of preset installation whatever feeds it, so
-only skipping the rebuild entirely wins.
+per-vendor caches costs ~2 s of preset installation whatever feeds it, so only
+skipping the rebuild entirely wins.

 Any change to the set — a vendor added, removed or updated, or its cache-only
 `.opc` replaced by a newer one — changes the stamps and retires the whole file;
-the wizard then rebuilds the bundle with `PresetBundle::load_vendors`, the load
-startup uses (per-vendor caches serving where they cover), and writes the catalog
-back. When a vendor fails to load, the filament library included, that open falls
-back to the wizard's own scan of the vendor JSONs, as when no bundle can be built,
-and writes nothing. Selections, region and per-open decorations are applied
-downstream of the cache either way, so a served catalog is indistinguishable from a
-rebuilt one. Nothing ships this file and the updater never touches it; it is a
-locally written artifact, re-derived whenever stale, written through a temp file and
-rename so half a cache is never readable.
+the wizard then rebuilds the bundle vendor by vendor (per-vendor caches serving where
+they cover) and writes the catalog back. Selections, region and per-open decorations
+are applied downstream of the cache either way, so a served catalog is
+indistinguishable from a rebuilt one. Nothing ships this file and the updater never
+touches it; it is a locally written artifact, re-derived whenever stale, written
+through a temp file and rename so half a cache is never readable.

 The cache lives under `<data_dir>/cache/`, not beside the vendors: everything that
 scans `<data_dir>/system/` treats any `.opc` there as a vendor, so a non-vendor
@@ -397,13 +378,6 @@ enumerates only `*.json` will find no vendors at all in a packaged build.
  the `CachedPreset` field list — written and read by `visit_entry` in
  `PresetCacheFormat.cpp`, one list for the save, the load and the name peek alike — or
  the cache's own layout or stamps, requires bumping `CACHE_VERSION` by hand.
- **Adding a kind of reference between presets**, as `inherits` and `include` are:
-  parse the names into `CachedPreset` (a field change, so `CACHE_VERSION` is bumped),
-  have `install_vendor_entries` end a run before an entry that names one already in it
-  and retain what the names point at, look them up only in `resolve_vendor_preset`, and
-  register what they point at only in `commit_vendor_preset`. The listing-order test in
-  `test_vendor_cache.cpp` fails for a kind the runs do not check once its fixture uses
-  it.
 - **The dictionary indexes with a `uint16`**, so `print_config_def` may hold at most
  65535 options and one cache at most 65535 distinct enum value names.
  `CacheDictionary::save` throws past that, which surfaces when CI generates the
@@ -1,6 +1,6 @@
 {
 	"name": "OrcaFilamentLibrary",
-	"version": "02.04.00.17",
+	"version": "02.04.00.15",
 	"force_update": "0",
 	"description": "Orca Filament Library",
 	"filament_list": [
@@ -6,7 +6,7 @@
 	"filament_id": "OFvgE0Zh",
 	"instantiation": "false",
 	"fan_cooling_layer_time": [
-		"85"
+		"81"
 	],
 	"fan_min_speed": [
 		"50"
@@ -111,7 +111,6 @@
 		"1"
 	],
 	"enable_pressure_advance": [
-		"0",
 		"0"
 	],
 	"eng_plate_temp": [
@@ -317,7 +316,6 @@
 		"2"
 	],
 	"pressure_advance": [
-		"0.02",
 		"0.02"
 	],
 	"reduce_fan_stop_start_freq": [
@@ -111,7 +111,6 @@
 		"1"
 	],
 	"enable_pressure_advance": [
-		"0",
 		"0"
 	],
 	"eng_plate_temp": [
@@ -317,7 +316,6 @@
 		"2"
 	],
 	"pressure_advance": [
-		"0.02",
 		"0.02"
 	],
 	"reduce_fan_stop_start_freq": [
@@ -111,7 +111,6 @@
 		"1"
 	],
 	"enable_pressure_advance": [
-		"0",
 		"0"
 	],
 	"eng_plate_temp": [
@@ -317,7 +316,6 @@
 		"2"
 	],
 	"pressure_advance": [
-		"0.02",
 		"0.02"
 	],
 	"reduce_fan_stop_start_freq": [
@@ -111,7 +111,6 @@
 		"1"
 	],
 	"enable_pressure_advance": [
-		"0",
 		"0"
 	],
 	"eng_plate_temp": [
@@ -317,7 +316,6 @@
 		"2"
 	],
 	"pressure_advance": [
-		"0.02",
 		"0.02"
 	],
 	"reduce_fan_stop_start_freq": [
@@ -111,7 +111,6 @@
 		"1"
 	],
 	"enable_pressure_advance": [
-		"0",
 		"0"
 	],
 	"eng_plate_temp": [
@@ -317,7 +316,6 @@
 		"2"
 	],
 	"pressure_advance": [
-		"0.02",
 		"0.02"
 	],
 	"reduce_fan_stop_start_freq": [
@@ -111,7 +111,6 @@
 		"1"
 	],
 	"enable_pressure_advance": [
-		"0",
 		"0"
 	],
 	"eng_plate_temp": [
@@ -317,7 +316,6 @@
 		"2"
 	],
 	"pressure_advance": [
-		"0.02",
 		"0.02"
 	],
 	"reduce_fan_stop_start_freq": [
@@ -111,7 +111,6 @@
 		"1"
 	],
 	"enable_pressure_advance": [
-		"0",
 		"0"
 	],
 	"eng_plate_temp": [
@@ -317,7 +316,6 @@
 		"2"
 	],
 	"pressure_advance": [
-		"0.02",
 		"0.02"
 	],
 	"reduce_fan_stop_start_freq": [
@@ -111,7 +111,6 @@
 		"1"
 	],
 	"enable_pressure_advance": [
-		"0",
 		"0"
 	],
 	"eng_plate_temp": [
@@ -317,7 +316,6 @@
 		"2"
 	],
 	"pressure_advance": [
-		"0.02",
 		"0.02"
 	],
 	"reduce_fan_stop_start_freq": [
@@ -111,7 +111,6 @@
 		"1"
 	],
 	"enable_pressure_advance": [
-		"0",
 		"0"
 	],
 	"eng_plate_temp": [
@@ -317,7 +316,6 @@
 		"2"
 	],
 	"pressure_advance": [
-		"0.02",
 		"0.02"
 	],
 	"reduce_fan_stop_start_freq": [
@@ -111,7 +111,6 @@
 		"1"
 	],
 	"enable_pressure_advance": [
-		"0",
 		"0"
 	],
 	"eng_plate_temp": [
@@ -317,7 +316,6 @@
 		"2"
 	],
 	"pressure_advance": [
-		"0.02",
 		"0.02"
 	],
 	"reduce_fan_stop_start_freq": [
@@ -111,7 +111,6 @@
 		"1"
 	],
 	"enable_pressure_advance": [
-		"0",
 		"0"
 	],
 	"eng_plate_temp": [
@@ -317,7 +316,6 @@
 		"1"
 	],
 	"pressure_advance": [
-		"0.02",
 		"0.02"
 	],
 	"reduce_fan_stop_start_freq": [
@@ -111,7 +111,6 @@
 		"1"
 	],
 	"enable_pressure_advance": [
-		"0",
 		"0"
 	],
 	"eng_plate_temp": [
@@ -317,7 +316,6 @@
 		"2"
 	],
 	"pressure_advance": [
-		"0.02",
 		"0.02"
 	],
 	"reduce_fan_stop_start_freq": [
@@ -111,7 +111,6 @@
 		"1"
 	],
 	"enable_pressure_advance": [
-		"0",
 		"0"
 	],
 	"eng_plate_temp": [
@@ -317,7 +316,6 @@
 		"0"
 	],
 	"pressure_advance": [
-		"0.02",
 		"0.02"
 	],
 	"reduce_fan_stop_start_freq": [
@@ -111,7 +111,6 @@
 		"1"
 	],
 	"enable_pressure_advance": [
-		"0",
 		"0"
 	],
 	"eng_plate_temp": [
@@ -317,7 +316,6 @@
 		"2"
 	],
 	"pressure_advance": [
-		"0.02",
 		"0.02"
 	],
 	"reduce_fan_stop_start_freq": [
@@ -111,7 +111,6 @@
 		"1"
 	],
 	"enable_pressure_advance": [
-		"0",
 		"0"
 	],
 	"eng_plate_temp": [
@@ -317,7 +316,6 @@
 		"2"
 	],
 	"pressure_advance": [
-		"0.02",
 		"0.02"
 	],
 	"reduce_fan_stop_start_freq": [
@@ -111,7 +111,6 @@
 		"1"
 	],
 	"enable_pressure_advance": [
-		"0",
 		"0"
 	],
 	"eng_plate_temp": [
@@ -317,7 +316,6 @@
 		"2"
 	],
 	"pressure_advance": [
-		"0.02",
 		"0.02"
 	],
 	"reduce_fan_stop_start_freq": [
@@ -111,7 +111,6 @@
 		"1"
 	],
 	"enable_pressure_advance": [
-		"0",
 		"0"
 	],
 	"eng_plate_temp": [
@@ -317,7 +316,6 @@
 		"2"
 	],
 	"pressure_advance": [
-		"0.02",
 		"0.02"
 	],
 	"reduce_fan_stop_start_freq": [
@@ -111,7 +111,6 @@
 		"1"
 	],
 	"enable_pressure_advance": [
-		"0",
 		"0"
 	],
 	"eng_plate_temp": [
@@ -317,7 +316,6 @@
 		"2"
 	],
 	"pressure_advance": [
-		"0.02",
 		"0.02"
 	],
 	"reduce_fan_stop_start_freq": [
@@ -111,7 +111,6 @@
 		"1"
 	],
 	"enable_pressure_advance": [
-		"0",
 		"0"
 	],
 	"eng_plate_temp": [
@@ -317,7 +316,6 @@
 		"0"
 	],
 	"pressure_advance": [
-		"0.02",
 		"0.02"
 	],
 	"reduce_fan_stop_start_freq": [
@@ -111,7 +111,6 @@
 		"1"
 	],
 	"enable_pressure_advance": [
-		"0",
 		"0"
 	],
 	"eng_plate_temp": [
@@ -317,7 +316,6 @@
 		"2"
 	],
 	"pressure_advance": [
-		"0.02",
 		"0.02"
 	],
 	"reduce_fan_stop_start_freq": [
@@ -111,7 +111,6 @@
 		"1"
 	],
 	"enable_pressure_advance": [
-		"0",
 		"0"
 	],
 	"eng_plate_temp": [
@@ -317,7 +316,6 @@
 		"2"
 	],
 	"pressure_advance": [
-		"0.02",
 		"0.02"
 	],
 	"reduce_fan_stop_start_freq": [
@@ -111,7 +111,6 @@
 		"1"
 	],
 	"enable_pressure_advance": [
-		"0",
 		"0"
 	],
 	"eng_plate_temp": [
@@ -317,7 +316,6 @@
 		"2"
 	],
 	"pressure_advance": [
-		"0.02",
 		"0.02"
 	],
 	"reduce_fan_stop_start_freq": [
@@ -111,7 +111,6 @@
 		"1"
 	],
 	"enable_pressure_advance": [
-		"0",
 		"0"
 	],
 	"eng_plate_temp": [
@@ -317,7 +316,6 @@
 		"2"
 	],
 	"pressure_advance": [
-		"0.02",
 		"0.02"
 	],
 	"reduce_fan_stop_start_freq": [
@@ -111,7 +111,6 @@
 		"1"
 	],
 	"enable_pressure_advance": [
-		"0",
 		"0"
 	],
 	"eng_plate_temp": [
@@ -317,7 +316,6 @@
 		"2"
 	],
 	"pressure_advance": [
-		"0.02",
 		"0.02"
 	],
 	"reduce_fan_stop_start_freq": [
@@ -111,7 +111,6 @@
 		"1"
 	],
 	"enable_pressure_advance": [
-		"0",
 		"0"
 	],
 	"eng_plate_temp": [
@@ -317,7 +316,6 @@
 		"2"
 	],
 	"pressure_advance": [
-		"0.02",
 		"0.02"
 	],
 	"reduce_fan_stop_start_freq": [
@@ -111,7 +111,6 @@
 		"1"
 	],
 	"enable_pressure_advance": [
-		"0",
 		"0"
 	],
 	"eng_plate_temp": [
@@ -317,7 +316,6 @@
 		"2"
 	],
 	"pressure_advance": [
-		"0.02",
 		"0.02"
 	],
 	"reduce_fan_stop_start_freq": [
@@ -214,9 +214,9 @@ function ShowModelInfo( pModel )
 	
 	SendWXDebugInfo("Model Name:  "+sModelName);
 	
-	$('#ModelName').text(sModelName);
+	$('#ModelName').html(sModelName);
 	$('#ModelName').attr('title',sModelName);
-    $('#ModelAuthorName').text(sModelAuthor);
+    $('#ModelAuthorName').html(sModelAuthor);
 	
 	switch(UploadType)
 	{
@@ -268,7 +268,7 @@ function ShowModelInfo( pModel )
 			break;
 	}
 	
-	$('#Model_Desc').empty().append( SanitizeDescHtml( html_decode(sModelDesc) ) );
+	$('#Model_Desc').html( html_decode(sModelDesc) );
 			
 	let ModelPreviewList=pModel.preview_img;				
    let TotalPreview=ModelPreviewList.length;
@@ -281,15 +281,16 @@ function ShowModelInfo( pModel )
 	
    if(TotalPreview>0)
 	{
-		$('#ModelPreviewList').empty();
+		let htmlPreview='';
 		for(let pn=0;pn<TotalPreview;pn++)			
 		{	
 			//let FTmpPath=decodeURIComponent(ModelPreviewList[pn]);
 			let FTmpPath=ModelPreviewList[pn]['filepath'];
 			
-			$('#ModelPreviewList').append( $('<div class="swiper-slide"></div>').append( $('<img class="Model_PrevImg" />').attr('src',FTmpPath) ) );
+			htmlPreview+='<div class="swiper-slide"><img class="Model_PrevImg" src="'+FTmpPath+'" /></div>';
 		}
 			
+	    $('#ModelPreviewList').html(htmlPreview);
 		$('#Model_Preview_Image').viewer({
 			title: false,
 		    fullsreen: false,
@@ -409,8 +410,7 @@ function ConstructFileHtml( ID, pItem )
 {
 	let fTotal=pItem.length;
 	
-	let pBoard=$('#'+ID+'  .FileListBoard');
-	pBoard.empty();
+	let strHtml='';
 	for( let f=0;f<fTotal;f++ )
 	{
 		let pOne=pItem[f];
@@ -443,139 +443,39 @@ function ConstructFileHtml( ID, pItem )
 			ImgPath='img/default.png';			
 		}		
 			
-		//Add html. File names come from the 3MF, so build the nodes rather than concatenating markup.
-		let pIconImg=$('<img />').attr('src',ImgPath);
-		let pMenu=$('<div class="FileMenu"><img src="img/s.svg" /></div>');
+		//Add html
 		if( strClass!='ImageIcon' )
 		{
-			pMenu.on('click', function(){ OnClickOpenFile(tPath); });
+		strHtml+='<div class="FileItem">'+
+				 '	<div class="'+strClass+'"><img src="'+ImgPath+'" /></div>'+
+				 '	<div class="FileText">'+
+			     '		<div class="FileName">'+tName+'</div>'+
+				 '	</div>'+
+				 '	<div class="FileMenu" onClick="OnClickOpenFile(\''+tPath+'\')"><img src="img/s.svg" /></div>'+
+				 '</div>';
 		}
 		else
 		{
 			ImgID++;
 			let TmpImgID="AF"+ImgID;
 			
-			pIconImg.attr('id',TmpImgID);
-			pMenu.on('click', function(){ OnClickOpenImage(TmpImgID); });
+		strHtml+='<div class="FileItem">'+
+				 '	<div class="'+strClass+'"><img id="'+TmpImgID+'" src="'+ImgPath+'" /></div>'+
+				 '	<div class="FileText">'+
+			     '		<div class="FileName">'+tName+'</div>'+
+				 '	</div>'+
+				 '	<div class="FileMenu" onClick="OnClickOpenImage(\''+TmpImgID+'\')"><img src="img/s.svg" /></div>'+
+				 '</div>';			
+		}
 	}
 	
-		let pFileItem=$('<div class="FileItem"></div>');
-		pFileItem.append( $('<div></div>').addClass(strClass).append(pIconImg) );
-		pFileItem.append( $('<div class="FileText"></div>').append( $('<div class="FileName"></div>').text(tName).attr('title',tName) ) );
-		pFileItem.append( pMenu );
-		pBoard.append( pFileItem );
-	}
+	$('#'+ID+'  .FileListBoard').html(strHtml);
 	
    if( fTotal>0 )
 		$('#'+ID).show();
 }


-// Descriptions are untrusted 3MF metadata that may carry rich-text HTML (e.g. from MakerWorld).
-// Rebuild them from an inert parse, keeping only plain formatting tags and http(s) links and images.
-var DescAllowedTags=['P','BR','B','STRONG','I','EM','U','S','STRIKE','DEL','INS','SUB','SUP','SMALL','MARK',
-	'Q','ABBR','KBD','WBR','H1','H2','H3','H4','H5','H6','UL','OL','LI','DL','DT','DD','BLOCKQUOTE','PRE','CODE',
-	'HR','SPAN','DIV','FIGURE','FIGCAPTION','TABLE','CAPTION','THEAD','TBODY','TFOOT','TR','TH','TD','A','IMG'];
-// Plain attributes kept per tag; the numeric ones must be plain non-negative integers.
-var DescAllowedAttrs={'IMG':['alt','title','width','height'],'TD':['colspan','rowspan'],'TH':['colspan','rowspan'],'OL':['start']};
-var DescNumericAttrs=['width','height','colspan','rowspan','start'];
-// Dropped together with their content; any other unknown tag is unwrapped to its children.
-var DescDroppedTags=['SCRIPT','STYLE','TEMPLATE','NOSCRIPT','TEXTAREA','TITLE','IFRAME','FRAME','OBJECT','EMBED','SVG','MATH'];
-
-function IsHttpUrl( strUrl )
-{
-	// The scheme must be written as is, so nothing the URL parser would strip can precede or split it.
-	if( typeof strUrl!='string' || !/^https?:/i.test(strUrl) )
-		return false;
-	try
-	{
-		let sProtocol=new URL(strUrl).protocol;
-		return sProtocol=='http:' || sProtocol=='https:';
-	}
-	catch(e)
-	{
-		return false;
-	}
-}
-
-// Images load as soon as the page opens, so only https sources are kept: no plain-http requests to the local network.
-function IsHttpsUrl( strUrl )
-{
-	return IsHttpUrl(strUrl) && new URL(strUrl).protocol=='https:';
-}
-
-// Embedded YouTube players become a plain link to the video.
-function GetYouTubeEmbedUrl( pNode )
-{
-	let sSrc=pNode.getAttribute('src');
-	if( !IsHttpUrl(sSrc) )
-		return null;
-	let pUrl=new URL(sSrc);
-	return ( pUrl.origin=='https://www.youtube.com' && pUrl.pathname.indexOf('/embed/')==0 ) ? pUrl.href : null;
-}
-
-function CopyDescNodes( pSrc, pDst )
-{
-	for( let pNode=pSrc.firstChild;pNode!=null;pNode=pNode.nextSibling )
-	{
-		if( pNode.nodeType==Node.TEXT_NODE )
-		{
-			pDst.appendChild( document.createTextNode(pNode.nodeValue) );
-			continue;
-		}
-		if( pNode.nodeType!=Node.ELEMENT_NODE )
-			continue;
-		
-		let sTag=pNode.nodeName.toUpperCase();
-		if( sTag=='IFRAME' )
-		{
-			let sVideoUrl=GetYouTubeEmbedUrl(pNode);
-			if( sVideoUrl!=null )
-			{
-				let pLink=document.createElement('A');
-				pLink.setAttribute('href',sVideoUrl);
-				pLink.textContent=sVideoUrl;
-				pDst.appendChild(pLink);
-			}
-			continue;
-		}
-		if( $.inArray(sTag,DescDroppedTags)>=0 )
-			continue;
-		if( $.inArray(sTag,DescAllowedTags)<0 )
-		{
-			CopyDescNodes(pNode,pDst);
-			continue;
-		}
-		
-		let pElem=document.createElement(sTag);
-		if( sTag=='A' && IsHttpUrl(pNode.getAttribute('href')) )
-			pElem.setAttribute('href',pNode.getAttribute('href'));
-		else if( sTag=='IMG' )
-		{
-			if( !IsHttpsUrl(pNode.getAttribute('src')) )
-				continue;
-			pElem.setAttribute('src',pNode.getAttribute('src'));
-		}
-		$.each( DescAllowedAttrs[sTag]||[], function(i,sAttr){
-			let sValue=pNode.getAttribute(sAttr);
-			if( sValue!=null && ( $.inArray(sAttr,DescNumericAttrs)<0 || /^\d+$/.test(sValue) ) )
-				pElem.setAttribute(sAttr,sValue);
-		});
-		CopyDescNodes(pNode,pElem);
-		pDst.appendChild(pElem);
-	}
-}
-
-function SanitizeDescHtml( strHtml )
-{
-	let pFragment=document.createDocumentFragment();
-	// A DOMParser document is inert: it runs no scripts and loads no resources.
-	let pDoc=new DOMParser().parseFromString(strHtml,'text/html');
-	if( pDoc && pDoc.body )
-		CopyDescNodes(pDoc.body,pFragment);
-	return pFragment;
-}
-
 function ShowProfilelInfo( pProfile )
 {
 	//==========Profile Info==========
@@ -583,10 +483,10 @@ function ShowProfilelInfo( pProfile )
 	let sProfileAuthor=decodeURIComponent(pProfile.author);
 	let sProfileDesc=decodeURIComponent(pProfile.description);
 	
-	$('#ProfileName').text(sProfileName);
-    $('#ProfileAuthor').text(sProfileAuthor);
+	$('#ProfileName').html(sProfileName);
+    $('#ProfileAuthor').html(sProfileAuthor);
 		
-	$('#Profile_Desc').empty().append( SanitizeDescHtml( html_decode(sProfileDesc) ) );
+	$('#Profile_Desc').html( html_decode(sProfileDesc) );
 			
 	let ProfilePreviewList=pProfile.preview_img;				
    let TotalPreview=ProfilePreviewList.length;
@@ -599,14 +499,15 @@ function ShowProfilelInfo( pProfile )
 	
    if(TotalPreview>0)
 	{
-		$('#ProfilePreviewList').empty();
+		let htmlPreview='';
 		for(let pn=0;pn<TotalPreview;pn++)			
 		{	
 			let FTmpPath=ProfilePreviewList[pn]['filepath'];
 			
-			$('#ProfilePreviewList').append( $('<div class="swiper-slide"></div>').append( $('<img class="Model_PrevImg" />').attr('src',FTmpPath) ) );
+			htmlPreview+='<div class="swiper-slide"><img class="Model_PrevImg" src="'+FTmpPath+'" /></div>';
 		}
 			
+		$('#ProfilePreviewList').html(htmlPreview);
 		$('#Profile_Preview_Image').viewer({
 			title: false,
 		    fullsreen: false,
@@ -2116,12 +2116,7 @@ int CLI::run(int argc, char **argv)

    // One resolver for the whole run, so presets from the same vendor tree share its load.
    std::unique_ptr<PresetBundle> system_preset_resolver;
-    auto ensure_system_preset_resolver = [&system_preset_resolver]() -> PresetBundle & {
-        if (!system_preset_resolver)
-            system_preset_resolver = std::make_unique<PresetBundle>();
-        return *system_preset_resolver;
-    };
-    auto resolve_preset = [&ensure_cli_preset_bundle, &ensure_system_preset_resolver](const std::string &file, DynamicPrintConfig &config,
+    auto resolve_preset = [&ensure_cli_preset_bundle, &system_preset_resolver](const std::string &file, DynamicPrintConfig &config,
                                                                               std::string &config_type, const std::string &config_from,
                                                                               bool probe_type, std::string &error) {
        const auto *inherits = config.option<ConfigOptionString>(BBL_JSON_KEY_INHERITS);
@@ -2131,7 +2126,9 @@ int CLI::run(int argc, char **argv)
        PresetBundle                 *bundle = nullptr;
        bool                          allow_source_manifest = false;
        if (config_from == "system") {
-            bundle                = &ensure_system_preset_resolver();
+            if (!system_preset_resolver)
+                system_preset_resolver = std::make_unique<PresetBundle>();
+            bundle                = system_preset_resolver.get();
            allow_source_manifest = true;
        } else {
            bundle = ensure_cli_preset_bundle(error);
@@ -3123,44 +3120,6 @@ int CLI::run(int argc, char **argv)
        return 0;
    };

-    // Load the project's printer and process settings as the GUI loads its presets: over the default preset,
-    // with every key the project does not list as changed, including keys saved before an option existed,
-    // taken from its current system preset.
-    auto load_project_preset = [this, &ensure_system_preset_resolver, &current_different_settings, filament_count](const std::string &system_name, Preset::Type type) {
-        if (system_name.empty())
-            return;
-        // Preset bookkeeping the CLI keeps in its own groups, e.g. inherits_group and print_compatible_printers.
-        static const std::set<std::string> bookkeeping_keys = {"inherits", "compatible_printers", "compatible_prints", "compatible_printers_condition",
-                                                               "compatible_prints_condition", "print_settings_id", "printer_settings_id"};
-        const size_t       index = type == Preset::TYPE_PRINTER ? filament_count + 1 : 0;
-        PresetBundle      &resolver = ensure_system_preset_resolver();
-        DynamicPrintConfig system_config;
-        t_config_option_keys keys;
-        const DynamicPrintConfig config = Preset::load_external_config(type,
-            type == Preset::TYPE_PRINTER ? resolver.printers.default_preset_for(m_print_config).config : resolver.prints.default_preset().config,
-            m_print_config, PresetBundle::project_different_keys(index < current_different_settings.size() ? current_different_settings[index] : std::string()),
-            [&](const std::string &) -> DynamicPrintConfig * {
-                std::string error;
-                if (resolver.resolve_system_preset(system_config, type, system_name, config_substitution_rule, error))
-                    return &system_config;
-                BOOST_LOG_TRIVIAL(warning) << boost::format("CLI: system preset '%1%' not resolved (%2%); the project keeps its values") % system_name % error;
-                return nullptr;
-            }, &keys);
-        for (const std::string &key : keys) {
-            const ConfigOption *opt = config.option(key);
-            const ConfigOption *old = m_print_config.option(key);
-            if (bookkeeping_keys.count(key) != 0 || opt == nullptr || (old != nullptr && *old == *opt))
-                continue;
-            BOOST_LOG_TRIVIAL(info) << boost::format("CLI: %1% from '%2%': %3% -> %4%") % key % system_name % (old ? old->serialize() : std::string("(missing)")) % opt->serialize();
-            m_print_config.set_key_value(key, opt->clone());
-        }
-    };
-    // The --uptodate path refreshes the project from its own system configs.
-    if (new_printer_name.empty() && load_machine_config.empty())
-        load_project_preset(current_printer_system_name, Preset::TYPE_PRINTER);
-    if (new_process_name.empty() && load_process_config.empty())
-        load_project_preset(current_process_system_name, Preset::TYPE_PRINT);
-
    std::vector<std::string>& different_settings = m_print_config.option<ConfigOptionStrings>("different_settings_to_system", true)->values;
    std::vector<std::string>& inherits_group = m_print_config.option<ConfigOptionStrings>("inherits_group", true)->values;
    inherits_group.resize(filament_count + 2, std::string());
@@ -3517,14 +3476,6 @@ int CLI::run(int argc, char **argv)
        }
        new_variant_counts = old_variant_counts;
        //filament_variant_count = old_variant_counts;
-        //ORCA: lay the per-variant options out one value per variant of the current filaments before each
-        //      loaded filament replaces its own variants, including an option only a loaded filament
-        //      defines, which otherwise starts as a single default value and never reaches the others.
-        for (const DynamicPrintConfig &config : load_filaments_config)
-            for (const std::string &opt_key : filament_options_with_variant)
-                if (opt_key != "filament_extruder_variant" && config.has(opt_key))
-                    m_print_config.option(opt_key, true);
-        normalize_filament_values_to_variants(m_print_config);
        for (int index = 0; index < load_filaments_config.size(); index++) {
            DynamicPrintConfig&  config = load_filaments_config[index];
            int filament_index = load_filaments_index[index];
@@ -3696,25 +3647,6 @@ int CLI::run(int argc, char **argv)
                }
            }

-            //ORCA: a per-variant option the loaded filament does not define keeps the values of the
-            //      variants the filament already had, and a variant new to it takes its first one's.
-            const int old_start = old_start_indice[filament_index - 1];
-            std::vector<int> kept_variant_indice = new_variant_indice;
-            for (int &i : kept_variant_indice)
-                if (i < 0)
-                    i = old_start;
-            for (const std::string &opt_key : filament_options_with_variant) {
-                if (config.has(opt_key))
-                    continue;
-                auto *opt_vec_dst = dynamic_cast<ConfigOptionVectorBase *>(m_print_config.option(opt_key));
-                if (opt_vec_dst == nullptr || opt_vec_dst->size() < size_t(old_start + old_variant_count))
-                    continue;
-                // set_with_restore_2() pads its source in place
-                std::unique_ptr<ConfigOption> old_values(opt_vec_dst->clone());
-                opt_vec_dst->set_with_restore_2(static_cast<ConfigOptionVectorBase *>(old_values.get()), kept_variant_indice, old_start,
-                                                old_variant_count, true);
-            }
-
            //update the old index
            if (old_variant_count != new_variant_count)
            {
@@ -4149,9 +4081,6 @@ int CLI::run(int argc, char **argv)
    if (printer_technology == ptFFF) {
        fff_print_config.apply(m_print_config, true);
        m_print_config.apply(fff_print_config, true);
-        //ORCA: an option no preset or project defines has just come in as its single default value, and a
-        //      command line override may hold one value per filament.
-        normalize_filament_values_to_variants(m_print_config);
    } else {
        boost::nowide::cerr << "invalid printer_technology " << std::endl;
        record_exit_reson(outfile_dir, CLI_INVALID_PRINTER_TECH, 0, cli_errors[CLI_INVALID_PRINTER_TECH], sliced_info);
@@ -205,6 +205,13 @@ void AppConfig::set_defaults()
    if (get("seq_top_layer_only").empty())
        set("seq_top_layer_only", "1");

+    // what the preview draws while the user drags it
+    {
+        const std::string mode = get("preview_reduced_detail_mode");
+        if (mode != "off" && mode != "solid" && mode != "shell")
+            set("preview_reduced_detail_mode", "off");
+    }
+
    // ORCA: darken the layers the preview layer slider is not scrubbed to
    if (get("preview_dim_previous_layers").empty())
        set_bool("preview_dim_previous_layers", false);
@@ -511,10 +518,6 @@ void AppConfig::set_defaults()
        set_bool("enable_high_low_temp_mixed_printing", false);
    }

-    if (get("remember_print_action").empty()) {
-        set_bool("remember_print_action", false);
-    }
-
    if (get("ignore_ext_filament_in_filament_map").empty()){
        set_bool("ignore_ext_filament_in_filament_map", false);
    }
@@ -355,7 +355,6 @@ set(lisbslic3r_sources
    Optimize/Optimizer.hpp
    Orient.cpp
    Orient.hpp
-    ParallelResolve.hpp
    ParameterUtils.cpp
    ParameterUtils.hpp
    pchheader.cpp
@@ -849,19 +849,6 @@ ConfigSubstitutions ConfigBase::load_from_json(const std::string &file, ForwardC
    return std::move(substitutions_ctxt.substitutions);
 }

-// Case-insensitive compare of a JSON key against a fixed ASCII one, without
-// boost::iequals, whose std::locale() takes a lock the whole process shares in the
-// MSVC runtime.
-static bool ascii_iequals(const std::string &key, const char *literal)
-{
-    auto lower = [](char c) { return (c >= 'A' && c <= 'Z') ? char(c - 'A' + 'a') : c; };
-    size_t i = 0;
-    for (; i < key.size() && literal[i] != '\0'; ++ i)
-        if (lower(key[i]) != lower(literal[i]))
-            return false;
-    return i == key.size() && literal[i] == '\0';
-}
-
 int ConfigBase::load_from_json(const std::string &file, ConfigSubstitutionContext& substitution_context, bool load_inherits_to_config, std::map<std::string, std::string>& key_values, std::string& reason)
 {
    json j;
@@ -929,44 +916,44 @@ int ConfigBase::load_from_json(const std::string &file, ConfigSubstitutionContex
        }
        //parse the json elements
        for (auto it = j.begin(); it != j.end(); it++) {
-            if (ascii_iequals(it.key(), BBL_JSON_KEY_VERSION)) {
+            if (boost::iequals(it.key(),BBL_JSON_KEY_VERSION)) {
                key_values.emplace(BBL_JSON_KEY_VERSION, it.value());
            }
-            else if (ascii_iequals(it.key(), BBL_JSON_KEY_IS_CUSTOM)) {
+            else if (boost::iequals(it.key(), BBL_JSON_KEY_IS_CUSTOM)) {
                //skip it
            }
-            else if (ascii_iequals(it.key(), BBL_JSON_KEY_NAME)) {
+            else if (boost::iequals(it.key(), BBL_JSON_KEY_NAME)) {
                key_values.emplace(BBL_JSON_KEY_NAME, it.value());
                if (it.value() == "project_settings")
                    is_project_settings = true;
            }
-            else if (ascii_iequals(it.key(), BBL_JSON_KEY_URL)) {
+            else if (boost::iequals(it.key(), BBL_JSON_KEY_URL)) {
                key_values.emplace(BBL_JSON_KEY_URL, it.value());
            }
-            else if (ascii_iequals(it.key(), BBL_JSON_KEY_TYPE)) {
+            else if (boost::iequals(it.key(), BBL_JSON_KEY_TYPE)) {
                key_values.emplace(BBL_JSON_KEY_TYPE, it.value());
            }
-            else if (ascii_iequals(it.key(), BBL_JSON_KEY_SETTING_ID)) {
+            else if (boost::iequals(it.key(), BBL_JSON_KEY_SETTING_ID)) {
                key_values.emplace(BBL_JSON_KEY_SETTING_ID, it.value());
            }
-            else if (ascii_iequals(it.key(), BBL_JSON_KEY_FILAMENT_ID)) {
+            else if (boost::iequals(it.key(), BBL_JSON_KEY_FILAMENT_ID)) {
                key_values.emplace(BBL_JSON_KEY_FILAMENT_ID, it.value());
            }
-            else if (ascii_iequals(it.key(), BBL_JSON_KEY_FROM)) {
+            else if (boost::iequals(it.key(), BBL_JSON_KEY_FROM)) {
                key_values.emplace(BBL_JSON_KEY_FROM, it.value());
            }
-            else if (ascii_iequals(it.key(), BBL_JSON_KEY_DESCRIPTION)) {
+            else if (boost::iequals(it.key(), BBL_JSON_KEY_DESCRIPTION)) {
                key_values.emplace(BBL_JSON_KEY_DESCRIPTION, it.value());
            }
-            else if (ascii_iequals(it.key(), BBL_JSON_KEY_INSTANTIATION)) {
+            else if (boost::iequals(it.key(), BBL_JSON_KEY_INSTANTIATION)) {
                key_values.emplace(BBL_JSON_KEY_INSTANTIATION, it.value());
            }
-            else if (!load_inherits_to_config && ascii_iequals(it.key(), BBL_JSON_KEY_INHERITS)) {
+            else if (!load_inherits_to_config && boost::iequals(it.key(), BBL_JSON_KEY_INHERITS)) {
                key_values.emplace(BBL_JSON_KEY_INHERITS, it.value());
            }
-            else if (!load_inherits_to_config && ascii_iequals(it.key(), BBL_JSON_KEY_INCLUDES)) {
+            else if (!load_inherits_to_config && boost::iequals(it.key(), BBL_JSON_KEY_INCLUDES)) {
                key_values.emplace(BBL_JSON_KEY_INCLUDES, it.value().dump());
-            } else if (ascii_iequals(it.key(), ORCA_JSON_KEY_RENAMED_FROM)) {
+            } else if (boost::iequals(it.key(), ORCA_JSON_KEY_RENAMED_FROM)) {
                key_values.emplace(ORCA_JSON_KEY_RENAMED_FROM, it.value());
            } else {
                t_config_option_key opt_key = it.key();
@@ -141,7 +141,7 @@ bool load_obj(const char *path, TriangleMesh *meshptr, ObjInfo& obj_info, std::s
                its.indices.emplace_back(indices[0], indices[1], indices[2]);
                int  face_index =its.indices.size() - 1;
                RGBA face_color;
-                auto set_face_color = [&uvs, &data, &mtl_data, &obj_info, &face_color](int face_index, const std::string mtl_name, const std::array<int, 3> &corners) {
+                auto set_face_color = [&uvs, &data, &mtl_data, &obj_info, &face_color](int face_index, const std::string mtl_name) {
                    if (mtl_data.new_mtl_unmap.find(mtl_name) != mtl_data.new_mtl_unmap.end()) {
                        bool is_merge_ka_kd = true;
                        for (size_t n = 0; n < 3; n++) {
@@ -174,7 +174,7 @@ bool load_obj(const char *path, TriangleMesh *meshptr, ObjInfo& obj_info, std::s
                                    return Vec2f::Zero();
                                return Vec2f(data.textureCoordinates[idx * OBJ_TEXCOORD_LENGTH], data.textureCoordinates[idx * OBJ_TEXCOORD_LENGTH + 1]);
                            };
-                            std::array<Vec2f, 3> uv_array{uv_at(uvs[corners[0]]), uv_at(uvs[corners[1]]), uv_at(uvs[corners[2]])};
+                            std::array<Vec2f, 3> uv_array{uv_at(uvs[0]), uv_at(uvs[1]), uv_at(uvs[2])};
                            obj_info.uvs.emplace_back(uv_array);
                        }
                        obj_info.face_colors.emplace_back(face_color);
@@ -185,27 +185,27 @@ bool load_obj(const char *path, TriangleMesh *meshptr, ObjInfo& obj_info, std::s
                        }
                    }
                };
-                auto set_face_color_by_mtl = [&data, &set_face_color](int face_index, const std::array<int, 3> &corners) {
+                auto set_face_color_by_mtl = [&data, &set_face_color](int face_index) {
                    if (data.usemtls.size() == 1) {
-                        set_face_color(face_index, data.usemtls[0].name, corners);
+                        set_face_color(face_index, data.usemtls[0].name);
                    } else {
                        for (size_t k = 0; k < data.usemtls.size(); k++) {
                            auto mtl = data.usemtls[k];
                            if (face_index >= mtl.face_start && face_index <= mtl.face_end) {
-                                set_face_color(face_index, data.usemtls[k].name, corners);
+                                set_face_color(face_index, data.usemtls[k].name);
                                break;
                            }
                        }
                    }
                };
                if (exist_mtl) {
-                    set_face_color_by_mtl(face_index, {0, 1, 2});
+                    set_face_color_by_mtl(face_index);
                }
                if (cnt == 4) {
                    its.indices.emplace_back(indices[0], indices[2], indices[3]);
                    int face_index = its.indices.size() - 1;
                    if (exist_mtl) {
-                        set_face_color_by_mtl(face_index, {0, 2, 3});
+                        set_face_color_by_mtl(face_index);
                    }
                }
            }
@@ -217,12 +217,8 @@ bool load_obj(const char *path, TriangleMesh *meshptr, ObjInfo& obj_info, std::s
        message = _L("This OBJ file couldn't be read because it's empty.");
        return false;
    }
-    if (meshptr->volume() < 0) {
+    if (meshptr->volume() < 0)
        meshptr->flip_triangles();
-        // Flipping swaps corners 1 and 2 of every face, so the UVs have to follow.
-        for (std::array<Vec2f, 3> &uv : obj_info.uvs)
-            std::swap(uv[1], uv[2]);
-    }
    // Hand the parsed material table back so callers can build a TexturedMesh from it.
    if (out_mtl)
        *out_mtl = mtl_data;
@@ -1497,7 +1497,12 @@ static std::vector<Vec2d> get_path_of_change_filament(const Print& print)
        check_add_eol(toolchange_gcode_str);

        // SoftFever: set new PA for new filament
-        gcode += gcodegen.set_filament_pressure_advance(new_filament_id);
+        if (gcodegen.config().enable_pressure_advance.get_at(new_filament_id)) {
+            gcode += gcodegen.writer().set_pressure_advance(gcodegen.config().pressure_advance.get_at(new_filament_id));
+            // Orca: Adaptive PA
+            // Reset Adaptive PA processor last PA value
+            gcodegen.m_pa_processor->resetPreviousPA(gcodegen.config().pressure_advance.get_at(new_filament_id));
+        }

        // A phony move to the end position at the wipe tower.
        gcodegen.writer().travel_to_xy((end_pos + plate_origin_2d).cast<double>());
@@ -1821,8 +1826,12 @@ static std::vector<Vec2d> get_path_of_change_filament(const Print& print)
        check_add_eol(toolchange_gcode_str);

        // SoftFever: set new PA for new filament
-        if (new_extruder_id != -1)
-            gcode += gcodegen.set_filament_pressure_advance(new_extruder_id);
+        if (new_extruder_id != -1 && gcodegen.config().enable_pressure_advance.get_at(new_extruder_id)) {
+            gcode += gcodegen.writer().set_pressure_advance(gcodegen.config().pressure_advance.get_at(new_extruder_id));
+            // Orca: Adaptive PA
+            // Reset Adaptive PA processor last PA value
+            gcodegen.m_pa_processor->resetPreviousPA(gcodegen.config().pressure_advance.get_at(new_extruder_id));
+        }

        // A phony move to the end position at the wipe tower.
        gcodegen.writer().travel_to_xy((end_pos + plate_origin_2d).cast<double>());
@@ -3223,7 +3232,7 @@ void GCode::_do_export(Print& print, GCodeOutputStream &file, ThumbnailsGenerato
    m_cooling_buffer->set_current_extruder(initial_extruder_id, extruder_id);

    // Orca: Initialise AdaptivePA processor filter
-    m_pa_processor = std::make_unique<AdaptivePAProcessor>(*this);
+    m_pa_processor = std::make_unique<AdaptivePAProcessor>(*this, tool_ordering.all_extruders());

    // Update output variables after the extruders were initialized.
    m_placeholder_parser_integration.init(m_writer);
@@ -3788,7 +3797,12 @@ void GCode::_do_export(Print& print, GCodeOutputStream &file, ThumbnailsGenerato
            }
        }
        // Orca: add missing PA settings for initial filament
-        file.write(set_filament_pressure_advance(initial_non_support_extruder_id));
+        if (m_config.enable_pressure_advance.get_at(initial_non_support_extruder_id)) {
+            file.write(m_writer.set_pressure_advance(m_config.pressure_advance.get_at(initial_non_support_extruder_id)));
+            // Orca: Adaptive PA
+            // Reset Adaptive PA processor last PA value
+            m_pa_processor->resetPreviousPA(m_config.pressure_advance.get_at(initial_non_support_extruder_id));
+        }
    }

    //flush FanMover buffer to avoid modifying the start gcode if it's manual.
@@ -4174,28 +4188,6 @@ void GCode::_do_export(Print& print, GCodeOutputStream &file, ThumbnailsGenerato

    print.throw_if_canceled();

-    // Some firmwares only scan the last N lines for the time estimate, so the stats are written
-    // after the config block.
-    if (!is_bbl_printers && !skip_config_block) {
-        file.write("; CONFIG_BLOCK_START\n");
-        std::string full_config;
-        append_full_config(print, full_config);
-        if (!full_config.empty())
-          file.write(full_config);
-
-        // SoftFever: write compatiple info
-        int first_layer_bed_temperature = get_bed_temperature(0, true, print.config().curr_bed_type);
-        file.write_format("; first_layer_bed_temperature = %d\n", first_layer_bed_temperature);
-        file.write_format("; bed_shape = %s\n", print.full_print_config().opt_serialize("printable_area").c_str());
-        file.write_format("; first_layer_temperature = %d\n", print.config().nozzle_temperature_initial_layer.get_at(0));
-        file.write_format("; first_layer_height = %.3f\n", print.config().initial_layer_print_height.value);
-
-          //SF TODO
-//        file.write_format("; variable_layer_height = %d\n", print.ad.adaptive_layer_height ? 1 : 0);
-
-        file.write("; CONFIG_BLOCK_END\n\n");
-    }
-
    // Get filament stats.
    file.write(DoExport::update_print_stats_and_format_filament_stats(
    	// Const inputs
@@ -4222,6 +4214,26 @@ void GCode::_do_export(Print& print, GCodeOutputStream &file, ThumbnailsGenerato
                GCodeProcessor::ETags::Estimated_Printing_Time_Placeholder)
            .c_str());
      file.write("\n");
+      if (!skip_config_block) {
+          file.write("; CONFIG_BLOCK_START\n");
+          std::string full_config;
+          append_full_config(print, full_config);
+          if (!full_config.empty())
+            file.write(full_config);
+
+          // SoftFever: write compatiple info
+          int first_layer_bed_temperature = get_bed_temperature(0, true, print.config().curr_bed_type);
+          file.write_format("; first_layer_bed_temperature = %d\n", first_layer_bed_temperature);
+          file.write_format("; bed_shape = %s\n", print.full_print_config().opt_serialize("printable_area").c_str());
+          file.write_format("; first_layer_temperature = %d\n", print.config().nozzle_temperature_initial_layer.get_at(0));
+          file.write_format("; first_layer_height = %.3f\n", print.config().initial_layer_print_height.value);
+
+            //SF TODO
+//          file.write_format("; variable_layer_height = %d\n", print.ad.adaptive_layer_height ? 1 : 0);
+
+          file.write("; CONFIG_BLOCK_END\n\n");
+      } // !skip_config_block
+
    }
    file.write("\n");

@@ -8378,16 +8390,12 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
    
    // Orca: Dynamic PA
    // If adaptive PA is enabled, by default evaluate PA on all extrusion moves
-    // The PA settings and the PA_CHANGE tags use the filament config index of the filament's extruder variant
-    const unsigned int pa_config_index = (unsigned int) get_filament_config_index(m_writer.filament()->id());
-    const bool adaptive_pa = m_config.adaptive_pressure_advance.get_at(pa_config_index) && m_config.enable_pressure_advance.get_at(pa_config_index);
-    const bool adaptive_pa_overhangs = adaptive_pa && m_config.adaptive_pressure_advance_overhangs.get_at(pa_config_index);
    bool is_pa_calib = m_curr_print->calib_mode() == CalibMode::Calib_PA_Line ||
                       m_curr_print->calib_mode() == CalibMode::Calib_PA_Pattern ||
                       m_curr_print->calib_mode() == CalibMode::Calib_PA_Tower;
    bool evaluate_adaptive_pa = false;
    bool role_change = (m_last_extrusion_role != path.role());
-    if (!is_pa_calib && adaptive_pa) {
+    if (!is_pa_calib && FILAMENT_CONFIG(adaptive_pressure_advance) && FILAMENT_CONFIG(enable_pressure_advance)) {
        evaluate_adaptive_pa = true;
        // If we have already emmited a PA change because the m_multi_flow_segment_path_pa_set is set
        // skip re-issuing the PA change tag.
@@ -8470,7 +8478,7 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
    // Post processor flag generation code segment when option to emit only at role changes is enabled
    // Variables published to the post processor:
    // 1) Tag to trigger a PA evaluation (because a role change was identified and the user has requested dynamic PA adjustments)
-    // 2) Current filament config index (to identify the PA model for the currently used filament and its extruder variant)
+    // 2) Current extruder ID (to identify the PA model for the currently used extruder)
    // 3) mm3_per_mm value (to then multiply by the final model print speed after slowdown for cooling is applied)
    // 4) the current acceleration (to pass to the model for evaluation)
    // 5) whether this is an external perimeter (for future use)
@@ -8481,7 +8489,7 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
        if (m_multi_flow_segment_path_average_mm3_per_mm > 0) {
            sprintf(buf, ";%sT%u MM3MM:%g ACCEL:%u BR:%d RC:%d OV:%d\n",
                    GCodeProcessor::reserved_tag(GCodeProcessor::ETags::PA_Change).c_str(),
-                    pa_config_index,
+                    m_writer.filament()->id(),
                    m_multi_flow_segment_path_average_mm3_per_mm,
                    acceleration_i,
                    ((path.role() == erBridgeInfill) ||(path.role() == erOverhangPerimeter)),
@@ -8494,7 +8502,7 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
                                    // to issue a zero flow PA change command for this
            sprintf(buf, ";%sT%u MM3MM:%g ACCEL:%u BR:%d RC:%d OV:%d\n",
                    GCodeProcessor::reserved_tag(GCodeProcessor::ETags::PA_Change).c_str(),
-                    pa_config_index,
+                    m_writer.filament()->id(),
                    _mm3_per_mm,
                    acceleration_i,
                    ((path.role() == erBridgeInfill) ||(path.role() == erOverhangPerimeter)),
@@ -8602,7 +8610,11 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
            // or a flow change, so emit the flag to evaluate PA for the upcomming extrusion
            // Emit tag before new speed is set so the post processor reads the next speed immediately and uses it.
            // Dont emit tag if it has just already been emitted from a role change above
-            if(_mm3_per_mm >0 && adaptive_pa_overhangs && !evaluate_adaptive_pa){
+            if(_mm3_per_mm >0 &&
+               FILAMENT_CONFIG(adaptive_pressure_advance) &&
+               FILAMENT_CONFIG(enable_pressure_advance) &&
+               FILAMENT_CONFIG(adaptive_pressure_advance_overhangs) &&
+               !evaluate_adaptive_pa){
                if(writer().get_current_speed() > F){ // Ramping down speed - use overhang logic where the minimum speed is used between current and upcoming extrusion
                    if(m_config.gcode_comments){
                        sprintf(buf, "; Ramp down-non-variable\n");
@@ -8610,7 +8622,7 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
                    }
                    sprintf(buf, ";%sT%u MM3MM:%g ACCEL:%u BR:%d RC:%d OV:%d\n",
                            GCodeProcessor::reserved_tag(GCodeProcessor::ETags::PA_Change).c_str(),
-                            pa_config_index,
+                            m_writer.filament()->id(),
                            _mm3_per_mm,
                            acceleration_i,
                            ((path.role() == erBridgeInfill) ||(path.role() == erOverhangPerimeter)),
@@ -8625,7 +8637,7 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
                    }
                    sprintf(buf, ";%sT%u MM3MM:%g ACCEL:%u BR:%d RC:%d OV:%d\n",
                            GCodeProcessor::reserved_tag(GCodeProcessor::ETags::PA_Change).c_str(),
-                            pa_config_index,
+                            m_writer.filament()->id(),
                            _mm3_per_mm,
                            acceleration_i,
                            ((path.role() == erBridgeInfill) ||(path.role() == erOverhangPerimeter)),
@@ -8831,7 +8843,10 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
                // ORCA: Adaptive PA code segment when adjusting PA within the same feature
                // There is a speed change or flow change so emit the flag to evaluate PA for the upcomming extrusion
                // Emit tag before new speed is set so the post processor reads the next speed immediately and uses it.
-                if(_mm3_per_mm >0 && adaptive_pa_overhangs){
+                if(_mm3_per_mm >0   &&
+                   EXTRUDER_CONFIG(adaptive_pressure_advance) &&
+                   EXTRUDER_CONFIG(enable_pressure_advance) &&
+                   EXTRUDER_CONFIG(adaptive_pressure_advance_overhangs) ){
                    if(last_set_speed > new_speed){ // Ramping down speed - use overhang logic where the minimum speed is used between current and upcoming extrusion
                        if(m_config.gcode_comments) {
                            sprintf(buf, "; Ramp up-variable\n");
@@ -8839,7 +8854,7 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
                        }
                        sprintf(buf, ";%sT%u MM3MM:%g ACCEL:%u BR:%d RC:%d OV:%d\n",
                                GCodeProcessor::reserved_tag(GCodeProcessor::ETags::PA_Change).c_str(),
-                                pa_config_index,
+                                m_writer.filament()->id(),
                                _mm3_per_mm,
                                acceleration_i,
                                ((path.role() == erBridgeInfill) ||(path.role() == erOverhangPerimeter)),
@@ -8854,7 +8869,7 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
                        }
                        sprintf(buf, ";%sT%u MM3MM:%g ACCEL:%u BR:%d RC:%d OV:%d\n",
                                GCodeProcessor::reserved_tag(GCodeProcessor::ETags::PA_Change).c_str(),
-                                pa_config_index,
+                                m_writer.filament()->id(),
                                _mm3_per_mm,
                                acceleration_i,
                                ((path.role() == erBridgeInfill) ||(path.role() == erOverhangPerimeter)),
@@ -9407,29 +9422,33 @@ void GCode::update_placeholder_parser_with_variant_params()
    if (num_filaments == 0)
        return;

-    // Helper: remap config arrays from variant index space to filament_id index space.
+    // Helpers: remap config arrays from variant index space to filament_id index space.
    // After remapping, gcode templates can use param[filament_id] directly.
-    auto remap_by_filament = [&](const auto &src) {
-        std::decay_t<decltype(src.values)> dst(num_filaments);
+    auto remap_floats_by_filament = [&](const auto &src) {
+        std::vector<double> dst(num_filaments);
+        for (size_t i = 0; i < num_filaments; ++i)
+            dst[i] = src.get_at(get_filament_config_index(i));
+        return dst;
+    };
+    auto remap_ints_by_filament = [&](const auto &src) {
+        std::vector<int> dst(num_filaments);
        for (size_t i = 0; i < num_filaments; ++i)
            dst[i] = src.get_at(get_filament_config_index(i));
        return dst;
    };

    // --- filament_options_with_variant: gcode indexes by filament_id ---
-    this->placeholder_parser().set("filament_max_volumetric_speed",       new ConfigOptionFloats(remap_by_filament(m_config.filament_max_volumetric_speed)));
-    this->placeholder_parser().set("filament_pre_cooling_temperature",    new ConfigOptionInts(remap_by_filament(m_config.filament_pre_cooling_temperature)));
-    this->placeholder_parser().set("filament_pre_cooling_temperature_nc", new ConfigOptionInts(remap_by_filament(m_config.filament_pre_cooling_temperature_nc)));
-    this->placeholder_parser().set("filament_cooling_before_tower",       new ConfigOptionFloats(remap_by_filament(m_config.filament_cooling_before_tower)));
-    this->placeholder_parser().set("nozzle_temperature_initial_layer",    new ConfigOptionInts(remap_by_filament(m_config.nozzle_temperature_initial_layer)));
-    this->placeholder_parser().set("nozzle_temperature",                  new ConfigOptionInts(remap_by_filament(m_config.nozzle_temperature)));
+    this->placeholder_parser().set("filament_max_volumetric_speed",       new ConfigOptionFloats(remap_floats_by_filament(m_config.filament_max_volumetric_speed)));
+    this->placeholder_parser().set("filament_pre_cooling_temperature",    new ConfigOptionInts(remap_ints_by_filament(m_config.filament_pre_cooling_temperature)));
+    this->placeholder_parser().set("filament_pre_cooling_temperature_nc", new ConfigOptionInts(remap_ints_by_filament(m_config.filament_pre_cooling_temperature_nc)));
+    this->placeholder_parser().set("filament_cooling_before_tower",       new ConfigOptionFloats(remap_floats_by_filament(m_config.filament_cooling_before_tower)));
+    this->placeholder_parser().set("nozzle_temperature_initial_layer",    new ConfigOptionInts(remap_ints_by_filament(m_config.nozzle_temperature_initial_layer)));
+    this->placeholder_parser().set("nozzle_temperature",                  new ConfigOptionInts(remap_ints_by_filament(m_config.nozzle_temperature)));
    // first_layer_temperature is a legacy alias of nozzle_temperature_initial_layer
-    this->placeholder_parser().set("first_layer_temperature",             new ConfigOptionInts(remap_by_filament(m_config.nozzle_temperature_initial_layer)));
-    this->placeholder_parser().set("pressure_advance",                    new ConfigOptionFloats(remap_by_filament(m_config.pressure_advance)));
-    this->placeholder_parser().set("enable_pressure_advance",             new ConfigOptionBools(remap_by_filament(m_config.enable_pressure_advance)));
+    this->placeholder_parser().set("first_layer_temperature",             new ConfigOptionInts(remap_ints_by_filament(m_config.nozzle_temperature_initial_layer)));

    // --- printer_options_with_variant_1: in m_config these are already merged as filament-indexed ---
-    this->placeholder_parser().set("retraction_distances_when_cut",       new ConfigOptionFloats(remap_by_filament(m_config.retraction_distances_when_cut)));
+    this->placeholder_parser().set("retraction_distances_when_cut",       new ConfigOptionFloats(remap_floats_by_filament(m_config.retraction_distances_when_cut)));
    // hotend_cooling_rate / hotend_heating_rate: gcode uses [filament_map[x]-1] (extruder_id), no remap needed

    // --- filament_map: per-layer dynamic, sync from m_config to placeholder_parser ---
@@ -9439,9 +9458,9 @@ void GCode::update_placeholder_parser_with_variant_params()
    {
        // Fast purge mode uses filament_flush_temp_fast; Default is inert.
        bool use_fast_flush = m_config.prime_volume_mode == PrimeVolumeMode::pvmFast;
-        auto flush_v_speed  = remap_by_filament(m_config.filament_flush_volumetric_speed);
-        auto filament_max_v = remap_by_filament(m_config.filament_max_volumetric_speed);
-        auto flush_temps    = remap_by_filament(use_fast_flush ? m_config.filament_flush_temp_fast
+        auto flush_v_speed  = remap_floats_by_filament(m_config.filament_flush_volumetric_speed);
+        auto filament_max_v = remap_floats_by_filament(m_config.filament_max_volumetric_speed);
+        auto flush_temps    = remap_ints_by_filament(use_fast_flush ? m_config.filament_flush_temp_fast
                                                                    : m_config.filament_flush_temp);
        for (size_t i = 0; i < num_filaments; ++i) {
            if (flush_v_speed[i] == 0)
@@ -9494,7 +9513,12 @@ std::string GCode::set_extruder(unsigned int new_filament_id, double print_z, bo
            gcode += this->placeholder_parser_process("filament_start_gcode", filament_start_gcode, new_filament_id, &config);
            check_add_eol(gcode);
        }
-        gcode += set_filament_pressure_advance(new_filament_id);
+        if (m_config.enable_pressure_advance.get_at(new_filament_id)) {
+            gcode += m_writer.set_pressure_advance(m_config.pressure_advance.get_at(new_filament_id));
+            // Orca: Adaptive PA
+            // Reset Adaptive PA processor last PA value
+            m_pa_processor->resetPreviousPA(m_config.pressure_advance.get_at(new_filament_id));
+        }

        gcode += m_writer.toolchange(new_filament_id, new_extruder_id);
        if (Extruder *fil = m_writer.filament())
@@ -9885,24 +9909,18 @@ std::string GCode::set_extruder(unsigned int new_filament_id, double print_z, bo
    if (m_ooze_prevention.enable && !defer_temp_wait)
        gcode += m_ooze_prevention.post_toolchange(*this);

-    gcode += set_filament_pressure_advance(new_filament_id);
+    if (m_config.enable_pressure_advance.get_at(new_filament_id)) {
+        gcode += m_writer.set_pressure_advance(m_config.pressure_advance.get_at(new_filament_id));
+        // Orca: Adaptive PA
+        // Reset Adaptive PA processor last PA value
+        m_pa_processor->resetPreviousPA(m_config.pressure_advance.get_at(new_filament_id));
+    }
    //Orca: tool changer or IDEX's firmware may change Z position, so we set it to unknown/undefined
    m_last_pos_defined = false;

    return gcode;
 }

-std::string GCode::set_filament_pressure_advance(unsigned int filament_id)
-{
-    const size_t fi = get_filament_config_index(filament_id);
-    if (!m_config.enable_pressure_advance.get_at(fi))
-        return {};
-    // Orca: Adaptive PA
-    // Reset Adaptive PA processor last PA value
-    m_pa_processor->resetPreviousPA(m_config.pressure_advance.get_at(fi));
-    return m_writer.set_pressure_advance(m_config.pressure_advance.get_at(fi));
-}
-
 inline std::string polygon_to_string(const Polygon &polygon, Print *print, bool is_print_space = false) {
    std::ostringstream gcode;
    gcode << "[";
@@ -281,8 +281,6 @@ public:
    // extra_retract forwards a PETG pre-extrusion over-extrusion; default 0 -> identical to the plain deretract.
    std::string     unretract(float extra_retract = 0.f) { return m_writer.unlift() + m_writer.unretract(extra_retract); }
    std::string     set_extruder(unsigned int extruder_id, double print_z, bool by_object=false, int toolchange_temp_override = -1, bool defer_temp_wait = false);
-    // Sets the pressure advance of the filament's extruder variant, if enabled for it.
-    std::string     set_filament_pressure_advance(unsigned int filament_id);
    bool is_BBL_Printer();
    WipeTowerType wipe_tower_type();

@@ -21,31 +21,39 @@ namespace Slic3r {
 *
 * @param gcodegen A reference to the GCode object that generates the G-code.
 */
-AdaptivePAProcessor::AdaptivePAProcessor(GCode &gcodegen)
+AdaptivePAProcessor::AdaptivePAProcessor(GCode &gcodegen, const std::vector<unsigned int> &tools_used)
    : m_gcodegen(gcodegen),
      m_config(gcodegen.config()),
      m_last_predicted_pa(0.0),
      m_max_next_feedrate(0.0),
      m_next_feedrate(0.0),
      m_current_feedrate(0.0),
-      m_last_config_index(-1),
+      m_last_extruder_id(-1),
      m_pa_change_pattern(R"(; PA_CHANGE:T(\d+) MM3MM:([0-9]*\.[0-9]+) ACCEL:(\d+) BR:(\d+) RC:(\d+) OV:(\d+))"),
      m_g1_f_pattern(R"(G1 F([0-9]+))")
 {
+    // Constructor body can be used for further initialization if necessary
+    for (unsigned int tool : tools_used) {
+        // Only enable model for the tool if both PA and adaptive PA options are enabled
+        if(m_config.adaptive_pressure_advance.get_at(tool) && m_config.enable_pressure_advance.get_at(tool)){
+            auto interpolator = std::make_unique<AdaptivePAInterpolator>();
+            // Get calibration values from extruder
+            std::string pa_calibration_values = m_config.adaptive_pressure_advance_model.get_at(tool);
+            // Setup the model and store it in the tool-interpolation model map
+            interpolator->parseAndSetData(pa_calibration_values);
+            m_AdaptivePAInterpolators[tool] = std::move(interpolator);
+        }
+    }
 }

-// Method to get the interpolator for a specific filament config index.
-// The model is built the first time an index is requested, as the indices in use depend on
-// the extruder variant each filament prints with.
-AdaptivePAInterpolator* AdaptivePAProcessor::getInterpolator(unsigned int config_index) {
-    auto [it, inserted] = m_AdaptivePAInterpolators.try_emplace(config_index);
-    // Only enable model for the index if both PA and adaptive PA options are enabled
-    if (inserted && m_config.adaptive_pressure_advance.get_at(config_index) && m_config.enable_pressure_advance.get_at(config_index)) {
-        it->second = std::make_unique<AdaptivePAInterpolator>();
-        it->second->parseAndSetData(m_config.adaptive_pressure_advance_model.get_at(config_index));
-    }
+// Method to get the interpolator for a specific tool ID
+AdaptivePAInterpolator* AdaptivePAProcessor::getInterpolator(unsigned int tool_id) {
+    auto it = m_AdaptivePAInterpolators.find(tool_id);
+    if (it != m_AdaptivePAInterpolators.end()) {
        return it->second.get();
    }
+    return nullptr;  // Handle the case where the tool_id was not found
+}

 /**
 * @brief Processes a layer of G-code and applies adaptive pressure advance.
@@ -100,17 +108,16 @@ std::string AdaptivePAProcessor::process_layer(std::string &&gcode) {
        // the PA for that material is set. As no tag below will be found for this extruder, the original PA is retained.
        if (line.find("; PA_CHANGE") == 0) { // prune lines quickly before running regex check as regex is more expensive to run
            if (std::regex_search(line, m_match, m_pa_change_pattern)) {
-                // The tag carries the filament config index, which selects the PA settings of the filament's extruder variant
-                int config_index = std::stoi(m_match[1].str());
+                int extruder_id = std::stoi(m_match[1].str());
                mm3mm_value = std::stod(m_match[2].str());
                accel_value = std::stod(m_match[3].str());
                int isBridge = std::stoi(m_match[4].str());
                int roleChange = std::stoi(m_match[5].str());
                int isOverhang = std::stoi(m_match[6].str());
                
-                // Check if the filament config index has changed
-                bool config_index_changed = (config_index != m_last_config_index);
-                m_last_config_index = config_index;
+                // Check if the extruder ID has changed
+                bool extruder_changed = (extruder_id != m_last_extruder_id);
+                m_last_extruder_id = extruder_id;
                
                // Save the PA_CHANGE line to output later after finding feedrate
                pa_change_line = line;
@@ -205,23 +212,23 @@ std::string AdaptivePAProcessor::process_layer(std::string &&gcode) {
                
                // Calculate the predicted PA using the upcomming feature maximum feedrate
                // Get the interpolator for the active tool
-                AdaptivePAInterpolator* interpolator = getInterpolator(m_last_config_index);
+                AdaptivePAInterpolator* interpolator = getInterpolator(m_last_extruder_id);
                
                double predicted_pa = 0;
                double adaptive_PA_speed = 0;
            
                if(!interpolator){ // Tool not found in the interpolator map
                    // Tool not found in the PA interpolator to tool map
-                    predicted_pa = m_config.enable_pressure_advance.get_at(m_last_config_index) ? m_config.pressure_advance.get_at(m_last_config_index) : 0;
+                    predicted_pa = m_config.enable_pressure_advance.get_at(m_last_extruder_id) ? m_config.pressure_advance.get_at(m_last_extruder_id) : 0;
                    if(m_config.gcode_comments) output << "; APA: Tool doesnt have APA enabled\n";
-                } else if (!interpolator->isInitialised() || (!m_config.adaptive_pressure_advance.get_at(m_last_config_index)) )
+                } else if (!interpolator->isInitialised() || (!m_config.adaptive_pressure_advance.get_at(m_last_extruder_id)) )
                    // Check if the model is not initialised by the constructor for the active extruder
                    // Also check that adaptive PA is enabled for that extruder. This should not be needed
                    // as the PA change flag should not be set upstream (in the GCode.cpp file) if adaptive PA is disabled
                    // however check for robustness sake.
                {
                    // Model failed or adaptive pressure advance not enabled - use default value from m_config
-                    predicted_pa = m_config.enable_pressure_advance.get_at(m_last_config_index) ? m_config.pressure_advance.get_at(m_last_config_index) : 0;
+                    predicted_pa = m_config.enable_pressure_advance.get_at(m_last_extruder_id) ? m_config.pressure_advance.get_at(m_last_extruder_id) : 0;
                    if(m_config.gcode_comments) output << "; APA: Interpolator setup failed, using default pressure advance\n";
                } else { // Model setup succeeded
                    // Proceed to identify the print speed to use to calculate the adaptive PA value
@@ -242,18 +249,18 @@ std::string AdaptivePAProcessor::process_layer(std::string &&gcode) {
                    predicted_pa = (*interpolator)(mm3mm_value * adaptive_PA_speed, accel_value);
                    
                    // This is a bridge, use the dedicated PA setting.
-                    if(isBridge && m_config.adaptive_pressure_advance_bridges.get_at(m_last_config_index) > EPSILON)
-                        predicted_pa = m_config.adaptive_pressure_advance_bridges.get_at(m_last_config_index);
+                    if(isBridge && m_config.adaptive_pressure_advance_bridges.get_at(m_last_extruder_id) > EPSILON)
+                        predicted_pa = m_config.adaptive_pressure_advance_bridges.get_at(m_last_extruder_id);
                    
                    if (predicted_pa < 0) { // If extrapolation fails, fall back to the default PA for the extruder.
-                        predicted_pa = m_config.enable_pressure_advance.get_at(m_last_config_index) ? m_config.pressure_advance.get_at(m_last_config_index) : 0;
+                        predicted_pa = m_config.enable_pressure_advance.get_at(m_last_extruder_id) ? m_config.pressure_advance.get_at(m_last_extruder_id) : 0;
                        if(m_config.gcode_comments) output << "; APA: Interpolation failed, using fallback pressure advance value\n";
                    }
                }
                if(m_config.gcode_comments) {
                    // Output debug GCode comments
                    output << pa_change_line << '\n'; // Output PA change command tag
-                    if(isBridge && m_config.adaptive_pressure_advance_bridges.get_at(m_last_config_index) > EPSILON)
+                    if(isBridge && m_config.adaptive_pressure_advance_bridges.get_at(m_last_extruder_id) > EPSILON)
                        output << "; APA Model Override (bridge)\n";
                    output << "; APA Current Speed: " << std::to_string(m_current_feedrate) << "\n";
                    output << "; APA Next Speed: " << std::to_string(m_next_feedrate) << "\n";
@@ -262,7 +269,7 @@ std::string AdaptivePAProcessor::process_layer(std::string &&gcode) {
                    output << "; APA Flow rate: " << std::to_string(mm3mm_value * m_max_next_feedrate) << "\n";
                    output << "; APA Prev PA: " << std::to_string(m_last_predicted_pa) << " New PA: " << std::to_string(predicted_pa) << "\n"; 
                }
-                if (config_index_changed || std::fabs(predicted_pa - m_last_predicted_pa) > EPSILON) {
+                if (extruder_changed || std::fabs(predicted_pa - m_last_predicted_pa) > EPSILON) {
                    output << m_gcodegen.writer().set_pressure_advance(predicted_pa); // Use m_writer to set pressure advance
                    m_last_predicted_pa = predicted_pa; // Update the last predicted PA value
                }
@@ -11,6 +11,7 @@
 #include <regex>
 #include <memory>
 #include <map>
+#include <vector>
 #include "AdaptivePAInterpolator.hpp"

 namespace Slic3r {
@@ -32,7 +33,7 @@ public:
     *
     * @param gcodegen A reference to the GCode object that generates the G-code.
     */
-    AdaptivePAProcessor(GCode &gcodegen);
+    AdaptivePAProcessor(GCode &gcodegen, const std::vector<unsigned int> &tools_used);
    
    /**
     * @brief Processes a layer of G-code and applies adaptive pressure advance.
@@ -69,25 +70,28 @@ public:
    
 private:
    GCode &m_gcodegen; ///< Reference to the GCode object.
-    std::unordered_map<unsigned int, std::unique_ptr<AdaptivePAInterpolator>> m_AdaptivePAInterpolators; ///< Map between Interpolator objects and filament config indices (null when adaptive PA is off)
+    std::unordered_map<unsigned int, std::unique_ptr<AdaptivePAInterpolator>> m_AdaptivePAInterpolators; ///< Map between Interpolator objects and tool ID's
    const PrintConfig &m_config; ///< Reference to the print configuration.
    double m_last_predicted_pa; ///< Last predicted pressure advance value.
    double m_max_next_feedrate; ///< Maximum feed rate (speed) for the upcomming island. If no speed is found, the previous island speed is used.
    double m_next_feedrate; ///< First feed rate (speed) for the upcomming island.
    double m_current_feedrate; ///< Current, latest feedrate.
-    int m_last_config_index; ///< Filament config index of the last PA_CHANGE tag.
+    int m_last_extruder_id; ///< Last used extruder ID.

    std::regex m_pa_change_pattern; ///< Regular expression to detect PA_CHANGE pattern.
    std::regex m_g1_f_pattern; ///< Regular expression to detect G1 F pattern.
    std::smatch m_match; ///< Match results for regular expressions.

    /**
-     * @brief Get the PA interpolator attached to the specified filament config index.
+     * @brief Get the PA interpolator attached to the specified tool ID.
     *
-     * @param config_index The filament config index (one per filament and extruder variant) for which the PA interpolation model is to be returned.
-     * @return The Adaptive PA Interpolator object corresponding to that index, or nullptr when adaptive PA is off for it.
+     * This method manually sets the adaptive PA internally held value.
+     * Call this when changing tools or in any other case where the internally assumed last PA value may be incorrect
+     *
+     * @param An integer with the tool ID for which the PA interpolation model is to be returned.
+     * @return The Adaptive PA Interpolator object corresponding to that tool.
     */
-    AdaptivePAInterpolator* getInterpolator(unsigned int config_index);
+    AdaptivePAInterpolator* getInterpolator(unsigned int tool_id);
 };

 } // namespace Slic3r
@@ -13,19 +13,8 @@
 namespace Slic3r {


-// How many setters this thread holds, so the ones nested in another can skip
-// setlocale, which takes a lock the whole process shares on Windows.
-static thread_local int s_numeric_locale_depth = 0;
-
 CNumericLocalesSetter::CNumericLocalesSetter()
 {
-    // Nested in another setter on this thread, whose "C" the separator check
-    // confirms is still set.
-    if (s_numeric_locale_depth > 0 && is_decimal_separator_point()) {
-        m_nested = true;
-        ++ s_numeric_locale_depth;
-        return;
-    }
 #ifdef _WIN32
    _configthreadlocale(_ENABLE_PER_THREAD_LOCALE);
    m_orig_numeric_locale = std::setlocale(LC_NUMERIC, nullptr);
@@ -40,17 +29,12 @@ CNumericLocalesSetter::CNumericLocalesSetter()
    m_new_locale = newlocale(LC_NUMERIC_MASK, "C", m_new_locale);
    uselocale(m_new_locale);
 #endif
-    // Counted last, since the destructor does not run for a constructor that throws.
-    ++ s_numeric_locale_depth;
 }



 CNumericLocalesSetter::~CNumericLocalesSetter()
 {
-    -- s_numeric_locale_depth;
-    if (m_nested)
-        return;
 #ifdef _WIN32
    std::setlocale(LC_NUMERIC, m_orig_numeric_locale.data());
 #else
@@ -19,13 +19,8 @@ class CNumericLocalesSetter {
 public:
    CNumericLocalesSetter();
    ~CNumericLocalesSetter();
-    // A copy would restore the locale twice, and count down once more than up.
-    CNumericLocalesSetter(const CNumericLocalesSetter&) = delete;
-    CNumericLocalesSetter& operator=(const CNumericLocalesSetter&) = delete;

 private:
-    // Inside another setter on this thread, which does the setting and restoring.
-    bool m_nested { false };
 #ifdef _WIN32
    std::string m_orig_numeric_locale;
 #else
@@ -1,65 +0,0 @@
-#pragma once
-
-#include <algorithm>
-#include <cstddef>
-#include <type_traits>
-#include <utility>
-#include <variant>
-#include <vector>
-
-#include <tbb/blocked_range.h>
-#include <tbb/parallel_for.h>
-#include <tbb/task_arena.h>
-#include <tbb/task_group.h>
-
-#include "Exception.hpp"
-
-namespace Slic3r {
-
-// A batch of resolved presets, each a whole config, is what resolve_then_commit adds
-// to peak memory, so it stays far below a vendor's preset count and above any core count.
-inline constexpr size_t resolve_batch_size = 64;
-
-// Resolve `count` items that do not depend on each other and install them one at
-// a time.
-//
-// `resolve(i)` runs on any thread and must read only, since the items are
-// resolved side by side. `commit(i, resolved)` is called for every item in index
-// order, on the calling thread, and is where shared state is written.
-//
-// The items are worked through in batches, so what is resolved and held at once
-// does not grow with `count`. An exception from either callable propagates after
-// the batches before it have been committed. A cancellation of the caller's task
-// group, which stops a batch partway without an exception, throws RuntimeError
-// before that batch commits.
-//
-// `ChunkSetup`, when given, is constructed once for each piece of a batch TBB hands
-// out, for per-thread state a resolve would otherwise set up per item, such as the
-// C numeric locale, whose setting takes a lock the whole process shares.
-template<class ChunkSetup = std::monostate, class Resolve, class Commit>
-void resolve_then_commit(size_t count, Resolve resolve, Commit commit)
-{
-    using Resolved = std::invoke_result_t<Resolve&, size_t>;
-
-    std::vector<Resolved> resolved(std::min(count, resolve_batch_size));
-    for (size_t first = 0; first < count; first += resolve_batch_size) {
-        const size_t last = std::min(first + resolve_batch_size, count);
-        // Isolated, so a thread waiting on the batch runs none of the caller's other
-        // tasks before finishing it.
-        tbb::this_task_arena::isolate([&] {
-            tbb::parallel_for(tbb::blocked_range<size_t>(first, last),
-                [&](const tbb::blocked_range<size_t>& range) {
-                    ChunkSetup setup;
-                    (void) setup;
-                    for (size_t i = range.begin(); i < range.end(); ++ i)
-                        resolved[i - first] = resolve(i);
-                });
-        });
-        if (tbb::is_current_task_group_canceling())
-            throw RuntimeError("resolve_then_commit: canceled before the batch was resolved");
-        for (size_t i = first; i < last; ++ i)
-            commit(i, std::move(resolved[i - first]));
-    }
-}
-
-} // namespace Slic3r
@@ -5,8 +5,6 @@
 #include "Preset.hpp"
 #include "PresetBundle.hpp"
 #include "AppConfig.hpp"
-#include "LocalesUtils.hpp"
-#include "ParallelResolve.hpp"

 #ifdef _MSC_VER
    #define WIN32_LEAN_AND_MEAN
@@ -508,11 +506,10 @@ void Preset::normalize(DynamicPrintConfig &config)
    handle_legacy_sla(config);
 }

-std::string Preset::remove_invalid_keys(DynamicPrintConfig &config, const DynamicPrintConfig &default_config,
-                                        const DynamicPrintConfig *added)
+std::string Preset::remove_invalid_keys(DynamicPrintConfig &config, const DynamicPrintConfig &default_config)
 {
    std::string incorrect_keys;
-    for (const std::string &key : (added != nullptr ? *added : config).keys())
+    for (const std::string &key : config.keys())
        if (! default_config.has(key)) {
            if (incorrect_keys.empty())
                incorrect_keys = key;
@@ -624,6 +621,7 @@ void Preset::load_info(const std::string& file)
            }
            else if (v.first.compare("base_id") == 0) {
                this->base_id = v.second.get_value<std::string>();
+                BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << " load info from: " << file << " and base_id: " << this->base_id;
                if (this->base_id.compare("null") == 0)
                    this->base_id.clear();
            }
@@ -976,37 +974,6 @@ void Preset::get_extruder_names_and_keysets(Type type, std::string& extruder_id_
    }
 }

-DynamicPrintConfig Preset::load_external_config(Type type, const DynamicPrintConfig &default_config, const DynamicPrintConfig &project_config,
-                                                const std::set<std::string> &different_settings_list,
-                                                const std::function<DynamicPrintConfig *(const std::string &inherits)> &find_base,
-                                                t_config_option_keys *keys)
-{
-    // Load the preset over a default preset, so that the missing fields are filled in from the default preset.
-    DynamicPrintConfig cfg(default_config);
-    // SoftFever: ignore print connection info from project
-    auto        cfg_keys = cfg.keys();
-    cfg_keys.erase(std::remove_if(cfg_keys.begin(), cfg_keys.end(),
-                              [](std::string &val) {
-                                return val == "print_host" || val == "print_host_webui" || val == "printhost_apikey" ||
-                                       val == "printhost_cafile" || val == "printhost_user" || val == "printhost_password" || val == "printhost_port";
-                              }),
-               cfg_keys.end());
-    cfg.apply_only(project_config, cfg_keys, true);
-
-    //add different settings check logic, replace the old system preset's default value with new system preset's default values
-    if (!different_settings_list.empty()) {
-        if (DynamicPrintConfig *base_config = find_base(Preset::inherits(cfg))) {
-            std::string extruder_id_name, extruder_variant_name;
-            std::set<std::string> *key_set1 = nullptr, *key_set2 = nullptr;
-            Preset::get_extruder_names_and_keysets(type, extruder_id_name, extruder_variant_name, &key_set1, &key_set2);
-            cfg.update_non_diff_values_to_base_config(*base_config, cfg_keys, different_settings_list, extruder_id_name, extruder_variant_name, *key_set1, *key_set2);
-        }
-    }
-    if (keys)
-        *keys = std::move(cfg_keys);
-    return cfg;
-}
-
 bool Preset::has_lidar(PresetBundle *preset_bundle)
 {
    bool has_lidar = false;
@@ -1702,169 +1669,6 @@ std::string PresetCollection::canonical_preset_name(const std::string &name, con
    return get_preset_canonical_name(parsed.bare, origin);
 }

-PresetCollection::UserPresetLoad PresetCollection::resolve_user_preset(
-    const boost::filesystem::path &file, const std::string &canonical_name,
-    const PresetOrigin &load_origin, ForwardCompatibilitySubstitutionRule substitution_rule,
-    const std::string &extruder_id_name, const std::string &extruder_variant_name,
-    std::set<std::string> *key_set1, std::set<std::string> *key_set2) const
-{
-    UserPresetLoad out;
-    out.preset = Preset(m_type, canonical_name, false);
-    Preset &preset = out.preset;
-    preset.bundle_id = load_origin.bundle_id;
-    preset.file = file.string();
-    // Load the preset file, apply preset values on top of defaults.
-    try {
-        fs::path idx_path(preset.file);
-        idx_path.replace_extension(".info");
-        if (fs::exists(idx_path)) {
-            out.info_file = idx_path.string();
-            preset.load_info(out.info_file);
-        }
-        DynamicPrintConfig config;
-        //BBS: change to json format
-        //ConfigSubstitutions config_substitutions = config.load_from_ini(preset.file, substitution_rule);
-        std::map<std::string, std::string> key_values;
-        std::string reason;
-        ConfigSubstitutions config_substitutions = config.load_from_json(preset.file, substitution_rule, key_values, reason);
-        if (! config_substitutions.empty())
-            out.substitutions.push_back({ preset.name, m_type, PresetConfigSubstitutions::Source::UserFile, preset.file, std::move(config_substitutions) });
-        if (!reason.empty()) {
-            out.discard_file = true;
-            out.errors.push_back((boost::format("parse config %1% failed") % preset.file).str());
-            return out;
-        }
-
-        std::string version_str = key_values[BBL_JSON_KEY_VERSION];
-        boost::optional<Semver> version = Semver::parse(version_str);
-        if (!version) return out;
-        preset.version = *version;
-
-        if (key_values.find(BBL_JSON_KEY_FILAMENT_ID) != key_values.end())
-            preset.filament_id = key_values[BBL_JSON_KEY_FILAMENT_ID];
-        if (key_values.find(BBL_JSON_KEY_DESCRIPTION) != key_values.end())
-            preset.description = key_values[BBL_JSON_KEY_DESCRIPTION];
-        if (key_values.find(BBL_JSON_KEY_INSTANTIATION) != key_values.end())
-            preset.is_visible = key_values[BBL_JSON_KEY_INSTANTIATION] != "false";
-
-        //Orca: find and use the inherit config as the base
-        const Preset* inherit_preset = nullptr;
-        ConfigOption* inherits_config = config.option(BBL_JSON_KEY_INHERITS);
-
-        // check inherits_config
-        if (inherits_config) {
-            ConfigOptionString * option_str = dynamic_cast<ConfigOptionString *> (inherits_config);
-            std::string inherits_value = option_str->value;
-            // Orca: try to find if the parent preset has been renamed
-            inherit_preset = this->find_preset2(inherits_value);
-            Preset::normalize_inherits(config, inherit_preset);
-        }
-        const Preset& default_preset = this->default_preset_for(config);
-        if (inherit_preset) {
-            preset.config = inherit_preset->config;
-            preset.filament_id = inherit_preset->filament_id;
-            extend_default_config_length(config, false, {});
-            preset.config.update_diff_values_to_child_config(config, extruder_id_name, extruder_variant_name, *key_set1, *key_set2);
-        }
-        else {
-            auto inherits_config2 = dynamic_cast<ConfigOptionString *>(inherits_config);
-            if ((inherits_config2 && !inherits_config2->value.empty())) {
-                out.errors.push_back((boost::format("can not find parent %1% for config %2%!") % inherits_config2->value % preset.file).str());
-                return out;
-            }
-            // We support custom root preset now
-            // Find a default preset for the config. The PrintPresetCollection provides different default preset based on the "printer_technology" field.
-            preset.config = default_preset.config;
-            preset.config.apply(std::move(config));
-            extend_default_config_length(preset.config, true, default_preset.config);
-        }
-
-        Preset::normalize(preset.config);
-        // Report configuration fields, which are misplaced into a wrong group.
-        std::string incorrect_keys = Preset::remove_invalid_keys(preset.config, default_preset.config);
-        if (!incorrect_keys.empty())
-            out.errors.push_back("Error in a preset file: The preset \"" + preset.file +
-                                 "\" contains the following incorrect keys: " + incorrect_keys + ", which were removed");
-
-        if (preset.type == Preset::TYPE_FILAMENT && preset.is_user() && preset.inherits().empty()) {
-            auto compatible_printers = dynamic_cast<ConfigOptionStrings *>(preset.config.option("compatible_printers", true));
-            if (compatible_printers && compatible_printers->values.empty()) {
-                size_t at_pos = canonical_name.find('@');
-                if (at_pos != std::string::npos && at_pos + 1 < canonical_name.length()) {
-                    compatible_printers->values.push_back(canonical_name.substr(at_pos + 1));
-                    out.save_compatible_printers = true;
-                }
-            }
-        }
-
-        preset.loaded = true;
-        out.complete = true;
-    } catch (const std::ifstream::failure &err) {
-        out.discard_file = true;
-        out.errors.push_back((boost::format("The user-config cannot be loaded: %1%. Reason: %2%") % preset.file % err.what()).str());
-        //throw Slic3r::RuntimeError(std::string("The selected preset cannot be loaded: ") + preset.file + "\n\tReason: " + err.what());
-    } catch (const std::runtime_error &err) {
-        out.discard_file = true;
-        out.errors.push_back((boost::format("Failed loading the user-config file: %1%. Reason: %2%") % preset.file % err.what()).str());
-        //throw Slic3r::RuntimeError(std::string("Failed loading the preset file: ") + preset.file + "\n\tReason: " + err.what());
-    }
-    out.install = true;
-    return out;
-}
-
-void PresetCollection::commit_user_preset(UserPresetLoad &&loaded, std::deque<Preset> &presets_loaded,
-                                          PresetsConfigSubstitutions &substitutions,
-                                          const std::function<void(Preset&)> &preset_loaded_fn,
-                                          bool read_only)
-{
-    Preset &preset = loaded.preset;
-    if (! loaded.info_file.empty())
-        BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << " load info from: " << loaded.info_file << " and base_id: " << preset.base_id;
-    append(substitutions, std::move(loaded.substitutions));
-    for (const std::string &error : loaded.errors) {
-        ++m_errors;
-        BOOST_LOG_TRIVIAL(error) << error;
-    }
-    if (loaded.discard_file && !read_only) {
-        fs::path file_path(loaded.preset.file);
-        if (fs::exists(file_path))
-            fs::remove(file_path);
-        file_path.replace_extension(".info");
-        if (fs::exists(file_path))
-            fs::remove(file_path);
-    }
-    if (!loaded.install)
-        return;
-
-    if (loaded.complete) {
-        if (loaded.save_compatible_printers) {
-            // A filesystem error from the rewrite is counted, and the preset still loads.
-            try {
-                if (!read_only)
-                    preset.save(nullptr);
-                BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << " added compatible_printers for preset: " << preset.name;
-            } catch (const std::runtime_error &err) {
-                ++m_errors;
-                BOOST_LOG_TRIVIAL(error) << __FUNCTION__ << " can not write compatible_printers back to " << preset.file << ": " << err.what();
-            }
-        }
-        //BBS: add some workaround for previous incorrect settings
-        if ((!preset.setting_id.empty())&&(preset.setting_id == preset.base_id))
-            preset.setting_id.clear();
-        BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << " load preset: " << preset.name << " and filament_id: " << preset.filament_id << " and base_id: " << preset.base_id;
-        //BBS: add config related logs
-        BOOST_LOG_TRIVIAL(debug) << __FUNCTION__ << boost::format(", preset type %1%, name %2%, path %3%, is_system %4%, is_default %5% is_visible %6%")%Preset::get_type_string(m_type) %preset.name %preset.file %preset.is_system %preset.is_default %preset.is_visible;
-        // add alias for custom filament preset
-        set_custom_preset_alias(preset);
-    }
-
-    if (preset_loaded_fn != nullptr)
-        preset_loaded_fn(preset);
-
-    BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << __LINE__ << " load config successful and preset name is:" << preset.name;
-    presets_loaded.emplace_back(std::move(preset));
-}
-
 // Load all presets found in dir_path.
 // Throws an exception on error.
 void PresetCollection::load_presets(
@@ -1902,8 +1706,6 @@ void PresetCollection::load_presets(
    std::set<std::string> *key_set1 = nullptr, *key_set2 = nullptr;
    Preset::get_extruder_names_and_keysets(m_type, extruder_id_name, extruder_variant_name, &key_set1, &key_set2);

-    struct UserPresetFile { fs::path path; std::string canonical_name; };
-    std::vector<UserPresetFile> files;
    //BBS: change to json format
    for (auto &dir_entry : boost::filesystem::directory_iterator(dir))
    {
@@ -1919,26 +1721,149 @@ void PresetCollection::load_presets(
                BOOST_LOG_TRIVIAL(warning) << "Preset already present, not loading: " << canonical_name;
                continue;
            }
-            files.push_back({ dir_entry.path(), std::move(canonical_name) });
+            try {
+                Preset preset(m_type, canonical_name, false);
+                preset.bundle_id = resolved_origin.bundle_id;
+                preset.file = dir_entry.path().string();
+                // Load the preset file, apply preset values on top of defaults.
+                try {
+                    fs::path idx_path(preset.file);
+                    idx_path.replace_extension(".info");
+                    if (fs::exists(idx_path)) {
+                        preset.load_info(idx_path.string());
+                    }
+                    DynamicPrintConfig config;
+                    //BBS: change to json format
+                    //ConfigSubstitutions config_substitutions = config.load_from_ini(preset.file, substitution_rule);
+                    std::map<std::string, std::string> key_values;
+                    std::string reason;
+                    ConfigSubstitutions config_substitutions = config.load_from_json(preset.file, substitution_rule, key_values, reason);
+                    if (! config_substitutions.empty())
+                        substitutions.push_back({ preset.name, m_type, PresetConfigSubstitutions::Source::UserFile, preset.file, std::move(config_substitutions) });
+                    if (!reason.empty()) {
+                        fs::path file_path(preset.file);
+                        if (!read_only && fs::exists(file_path))
+                            fs::remove(file_path);
+                        file_path.replace_extension(".info");
+                        if (!read_only && fs::exists(file_path))
+                            fs::remove(file_path);
+                        BOOST_LOG_TRIVIAL(error) << boost::format("parse config %1% failed")%preset.file;
+                        ++m_errors;
+                        continue;
+                    }
+
+                    std::string version_str = key_values[BBL_JSON_KEY_VERSION];
+                    boost::optional<Semver> version = Semver::parse(version_str);
+                    if (!version) continue;
+                    preset.version = *version;
+
+                    if (key_values.find(BBL_JSON_KEY_FILAMENT_ID) != key_values.end())
+                        preset.filament_id = key_values[BBL_JSON_KEY_FILAMENT_ID];
+                    if (key_values.find(BBL_JSON_KEY_DESCRIPTION) != key_values.end())
+                        preset.description = key_values[BBL_JSON_KEY_DESCRIPTION];
+                    if (key_values.find(BBL_JSON_KEY_INSTANTIATION) != key_values.end())
+                        preset.is_visible = key_values[BBL_JSON_KEY_INSTANTIATION] != "false";
+
+                    //Orca: find and use the inherit config as the base
+                    Preset* inherit_preset = nullptr;
+                    ConfigOption* inherits_config = config.option(BBL_JSON_KEY_INHERITS);
+
+                    // check inherits_config
+                    if (inherits_config) {
+                        ConfigOptionString * option_str = dynamic_cast<ConfigOptionString *> (inherits_config);
+                        std::string inherits_value = option_str->value;
+                        // Orca: try to find if the parent preset has been renamed
+                        inherit_preset = this->find_preset2(inherits_value);
+                        Preset::normalize_inherits(config, inherit_preset);
+                    } else {
+                        ;
+                    }
+                    const Preset& default_preset = this->default_preset_for(config);
+                    if (inherit_preset) {
+                        preset.config = inherit_preset->config;
+                        preset.filament_id = inherit_preset->filament_id;
+                        extend_default_config_length(config, false, {});
+                        preset.config.update_diff_values_to_child_config(config, extruder_id_name, extruder_variant_name, *key_set1, *key_set2);
+                    }
+                    else {
+                        auto inherits_config2 = dynamic_cast<ConfigOptionString *>(inherits_config);
+                        if ((inherits_config2 && !inherits_config2->value.empty())) {
+                            BOOST_LOG_TRIVIAL(error) << boost::format("can not find parent %1% for config %2%!")%inherits_config2->value %preset.file;
+                            ++m_errors;
+                            continue;
+                        }
+                        // We support custom root preset now
+                        // Find a default preset for the config. The PrintPresetCollection provides different default preset based on the "printer_technology" field.
+                        preset.config = default_preset.config;
+                        preset.config.apply(std::move(config));
+                        extend_default_config_length(preset.config, true, default_preset.config);
+                    }
+                    BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << " load preset: " << name << " and filament_id: " << preset.filament_id << " and base_id: " << preset.base_id;
+
+                    Preset::normalize(preset.config);
+                    // Report configuration fields, which are misplaced into a wrong group.
+                    std::string incorrect_keys = Preset::remove_invalid_keys(preset.config, default_preset.config);
+                    if (!incorrect_keys.empty()) {
+                        ++m_errors;
+                        BOOST_LOG_TRIVIAL(error)
+                            << "Error in a preset file: The preset \"" << preset.file
+                            << "\" contains the following incorrect keys: " << incorrect_keys << ", which were removed";
+                    }
+
+                    if (preset.type == Preset::TYPE_FILAMENT && preset.is_user() && preset.inherits().empty()) {
+                        auto compatible_printers = dynamic_cast<ConfigOptionStrings *>(preset.config.option("compatible_printers", true));
+                        if (compatible_printers && compatible_printers->values.empty()) {
+                            size_t at_pos = name.find('@');
+                            if (at_pos != std::string::npos && at_pos + 1 < name.length()) {
+                                compatible_printers->values.push_back(name.substr(at_pos + 1));
+                                if (!read_only)
+                                    preset.save(nullptr);
+                                BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << " added compatible_printers for preset: " << name;
+                            }
                        }
                    }

-    resolve_then_commit<CNumericLocalesSetter>(files.size(),
-        [&](size_t i) {
-            return this->resolve_user_preset(files[i].path, files[i].canonical_name, resolved_origin, substitution_rule,
-                                             extruder_id_name, extruder_variant_name, key_set1, key_set2);
-        },
-        [&](size_t, UserPresetLoad &&loaded) {
-            // Committing can remove an unreadable preset's file, and a filesystem error
-            // there is reported without stopping the rest of the directory.
-            try {
-                this->commit_user_preset(std::move(loaded), presets_loaded, substitutions, preset_loaded_fn, read_only);
+                    preset.loaded = true;
+                    //BBS: add some workaround for previous incorrect settings
+                    if ((!preset.setting_id.empty())&&(preset.setting_id == preset.base_id))
+                        preset.setting_id.clear();
+                    //BBS: add config related logs
+                    BOOST_LOG_TRIVIAL(debug) << __FUNCTION__ << boost::format(", preset type %1%, name %2%, path %3%, is_system %4%, is_default %5% is_visible %6%")%Preset::get_type_string(m_type) %preset.name %preset.file %preset.is_system %preset.is_default %preset.is_visible;
+                    // add alias for custom filament preset
+                    set_custom_preset_alias(preset);
+                } catch (const std::ifstream::failure &err) {
+                    ++m_errors;
+                    BOOST_LOG_TRIVIAL(error) << boost::format("The user-config cannot be loaded: %1%. Reason: %2%")%preset.file %err.what();
+                    fs::path file_path(preset.file);
+                    if (!read_only && fs::exists(file_path))
+                        fs::remove(file_path);
+                    file_path.replace_extension(".info");
+                    if (!read_only && fs::exists(file_path))
+                        fs::remove(file_path);
+                    //throw Slic3r::RuntimeError(std::string("The selected preset cannot be loaded: ") + preset.file + "\n\tReason: " + err.what());
+                } catch (const std::runtime_error &err) {
+                    ++m_errors;
+                    BOOST_LOG_TRIVIAL(error) << boost::format("Failed loading the user-config file: %1%. Reason: %2%")%preset.file %err.what();
+                    //throw Slic3r::RuntimeError(std::string("Failed loading the preset file: ") + preset.file + "\n\tReason: " + err.what());
+                    fs::path file_path(preset.file);
+                    if (!read_only && fs::exists(file_path))
+                        fs::remove(file_path);
+                    file_path.replace_extension(".info");
+                    if (!read_only && fs::exists(file_path))
+                        fs::remove(file_path);
+                }
+
+                if (preset_loaded_fn != nullptr)
+                    preset_loaded_fn(preset);
+
+                presets_loaded.emplace_back(preset);
+                BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << __LINE__ << " load config successful and preset name is:" << preset.name;
            } catch (const std::runtime_error &err) {
                errors_cummulative += err.what();
                errors_cummulative += "\n";
            }
-        });
-
+        }
+    }
    if (presets_loaded.size() > 0)
        m_presets.insert(m_presets.end(), std::make_move_iterator(presets_loaded.begin()), std::make_move_iterator(presets_loaded.end()));
    sort_presets();
@@ -2671,6 +2596,20 @@ std::pair<Preset*, bool> PresetCollection::load_external_preset(
    const Semver                file_version,
    const std::string           filament_id)
 {
+    // Load the preset over a default preset, so that the missing fields are filled in from the default preset.
+    DynamicPrintConfig cfg(this->default_preset_for(combined_config).config);
+    // SoftFever: ignore print connection info from project
+    auto        keys = cfg.keys();
+    keys.erase(std::remove_if(keys.begin(), keys.end(),
+                              [](std::string &val) {
+                                return val == "print_host" || val == "print_host_webui" || val == "printhost_apikey" ||
+                                       val == "printhost_cafile" || val == "printhost_user" || val == "printhost_password" || val == "printhost_port";
+                              }),
+               keys.end());
+    cfg.apply_only(combined_config, keys, true);
+    std::string                 &inherits = Preset::inherits(cfg);
+
+    //add different settings check logic, replace the old system preset's default value with new system preset's default values
    std::deque<Preset>::iterator it       = this->find_preset_internal(original_name);
    bool                         found    = it != m_presets.end() && it->name == original_name;
    if (! found) {
@@ -2679,25 +2618,24 @@ std::pair<Preset*, bool> PresetCollection::load_external_preset(
        found = it != m_presets.end();
    }

-    t_config_option_keys keys;
-    DynamicPrintConfig cfg = Preset::load_external_config(m_type, this->default_preset_for(combined_config).config, combined_config, different_settings_list,
-        [this, &original_name, &path, found, it](const std::string &inherits) -> DynamicPrintConfig * {
-            if (!inherits.empty()) {
+    std::string extruder_id_name, extruder_variant_name;
+    std::set<std::string> *key_set1 = nullptr, *key_set2 = nullptr;
+    Preset::get_extruder_names_and_keysets(m_type, extruder_id_name, extruder_variant_name, &key_set1, &key_set2);
+
+    if (!inherits.empty() && (different_settings_list.size() > 0)) {
        auto iter = this->find_preset_internal(inherits);
        if (iter == m_presets.end() || iter->name != inherits)
            iter = this->find_preset_renamed(inherits);
-                if (iter == m_presets.end())
-                    return nullptr;
-                BOOST_LOG_TRIVIAL(info) << "load_external_preset" << boost::format(": change preset %1% inherit %2% 's value to %3% 's values")%original_name %inherits %path;
-                return &iter->config;
+        if (iter != m_presets.end()) {
+            //std::vector<std::string> dirty_options = cfg.diff(iter->config);
+            BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << boost::format(": change preset %1% inherit %2% 's value to %3% 's values")%original_name %inherits %path;
+            cfg.update_non_diff_values_to_base_config(iter->config, keys, different_settings_list, extruder_id_name, extruder_variant_name, *key_set1, *key_set2);
        }
-            if (found && it->is_system) {
-                BOOST_LOG_TRIVIAL(info) << "load_external_preset" << boost::format(": change preset %1% 's value to %2% 's values")%original_name %path;
-                return &it->config;
    }
-            return nullptr;
-        }, &keys);
-    std::string                 &inherits = Preset::inherits(cfg);
+    else if (found && it->is_system && (different_settings_list.size() > 0)) {
+        BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << boost::format(": change preset %1% 's value to %2% 's values")%original_name %path;
+        cfg.update_non_diff_values_to_base_config(it->config, keys, different_settings_list, extruder_id_name, extruder_variant_name, *key_set1, *key_set2);
+    }

    //BBS: add config related logs
    BOOST_LOG_TRIVIAL(debug) << __FUNCTION__ << boost::format(" enter, type %1% , path %2%, name %3%, original_name %4%, inherits %5%")%Preset::get_type_string(m_type) %path %name %original_name %inherits;
@@ -2889,18 +2827,6 @@ std::pair<Preset*, bool> PresetCollection::load_external_preset(
    return std::make_pair(&preset, false);
 }

-Preset& PresetCollection::append_preset(std::string &&path, const std::string &name, DynamicPrintConfig &&config)
-{
-    lock();
-    Preset &preset = m_presets.emplace_back(m_type, name, false);
-    preset.file = std::move(path);
-    preset.config = std::move(config);
-    preset.loaded = true;
-    preset.is_dirty = false;
-    unlock();
-    return preset;
-}
-
 Preset& PresetCollection::load_preset(const std::string &path, const std::string &name, DynamicPrintConfig &&config, bool select, Semver file_version)
 {
    lock();
@@ -3920,53 +3846,28 @@ bool PresetCollection::select_preset_by_name_strict(const std::string &name)
    return false;
 }

-std::vector<std::vector<std::string>> PresetCollection::merge_presets(const std::vector<PresetCollection*> &others, const VendorMap &new_vendors)
+// Merge one vendor's presets with the other vendor's presets, report duplicates.
+std::vector<std::string> PresetCollection::merge_presets(PresetCollection &&other, const VendorMap &new_vendors)
 {
-    auto less = [this](const Preset &a, const Preset &b) {
-        return m_type == Preset::TYPE_FILAMENT ? filament_preset_less(a, b) : a < b;
-    };
-    struct Incoming { Preset *preset; size_t source; };
-    auto incoming_less = [&less](const Incoming &a, const Incoming &b) { return less(*a.preset, *b.preset); };
-    // Each of `others` is sorted, so its presets form one sorted run.
-    std::vector<Incoming> incoming;
-    std::vector<size_t>   run_ends { 0 };
-    for (size_t source = 0; source < others.size(); ++ source) {
-        for (Preset &preset : others[source]->m_presets)
-            if (! preset.is_default && ! preset.is_external)
-                incoming.push_back({ &preset, source });
-        assert(std::is_sorted(incoming.begin() + run_ends.back(), incoming.end(), incoming_less));
-        run_ends.push_back(incoming.size());
-    }
-    // Merged pairwise and stably, so equal names stay in the order of `others`.
-    const size_t runs = others.size();
-    for (size_t width = 1; width < runs; width *= 2)
-        for (size_t i = 0; i + width < runs; i += 2 * width)
-            std::inplace_merge(incoming.begin() + run_ends[i], incoming.begin() + run_ends[i + width],
-                               incoming.begin() + run_ends[std::min(i + 2 * width, runs)], incoming_less);
-
-    std::vector<std::vector<std::string>> duplicates(others.size());
-    std::deque<Preset> merged;
-    auto own = m_presets.begin() + m_num_default_presets;
-    std::move(m_presets.begin(), own, std::back_inserter(merged));
-    // On equal names this collection's preset is kept, else the earliest of `others`,
-    // and each repeat is listed under the collection it came from.
-    for (auto next = incoming.begin(); own != m_presets.end() || next != incoming.end();) {
-        if (next == incoming.end() || (own != m_presets.end() && ! less(*next->preset, *own)))
-            merged.emplace_back(std::move(*own ++));
-        else {
-            Preset &preset = *(next ++)->preset;
+    std::vector<std::string> duplicates;
+    for (Preset &preset : other.m_presets) {
+        if (preset.is_default || preset.is_external)
+            continue;
+        Preset key(m_type, preset.name);
+        auto it = (m_type == Preset::TYPE_FILAMENT)
+            ? std::lower_bound(m_presets.begin() + m_num_default_presets, m_presets.end(), key, filament_preset_less)
+            : std::lower_bound(m_presets.begin() + m_num_default_presets, m_presets.end(), key);
+        if (it == m_presets.end() || it->name != preset.name) {
            if (preset.vendor != nullptr) {
                // Re-assign a pointer to the vendor structure in the new PresetBundle.
                auto it = new_vendors.find(preset.vendor->id);
                assert(it != new_vendors.end());
                preset.vendor = &it->second;
            }
-            merged.emplace_back(std::move(preset));
+            m_presets.emplace(it, std::move(preset));
+        } else
+            duplicates.emplace_back(std::move(preset.name));
    }
-        for (; next != incoming.end() && next->preset->name == merged.back().name; ++ next)
-            duplicates[next->source].emplace_back(next->preset->name);
-    }
-    m_presets = std::move(merged);
    return duplicates;
 }

@@ -403,15 +403,6 @@ public:
    std::string get_current_printer_type(PresetBundle *preset_bundle); // get current preset type

    static void get_extruder_names_and_keysets(Type type, std::string& extruder_id_name, std::string& extruder_variant_name, std::set<std::string>** p_key_set1, std::set<std::string>** p_key_set2);
-    // Config of a preset loaded from a project or config file: the project's values over the type's
-    // default preset config, without the print-host keys. When different_settings_list is not empty,
-    // every key not listed in it is then refreshed from the base system preset, which find_base returns
-    // for the project's "inherits" (nullptr when there is none), with the listed per-variant values
-    // mapped onto the base's extruder variants. keys, if given, receives the keys taken from the project.
-    static DynamicPrintConfig load_external_config(Type type, const DynamicPrintConfig &default_config, const DynamicPrintConfig &project_config,
-                                                   const std::set<std::string> &different_settings_list,
-                                                   const std::function<DynamicPrintConfig *(const std::string &inherits)> &find_base,
-                                                   t_config_option_keys *keys = nullptr);
    std::string get_printer_id() const { return vendor ? vendor->id : ""; }

    bool has_lidar(PresetBundle *preset_bundle);
@@ -454,10 +445,7 @@ public:
    static std::string                      remove_suffix_modified(const std::string& name);
    static void                             normalize(DynamicPrintConfig &config);
    // Report configuration fields, which are misplaced into a wrong group, remove them from the config.
-    // `added`, when given, is the diff applied over a copy of default_config, and only
-    // its keys are checked, since no other key can be missing from default_config.
-    static std::string                      remove_invalid_keys(DynamicPrintConfig &config, const DynamicPrintConfig &default_config,
-                                                                const DynamicPrintConfig *added = nullptr);
+    static std::string                      remove_invalid_keys(DynamicPrintConfig &config, const DynamicPrintConfig &default_config);

    // BBS: move constructor to public
    Preset(Type type, const std::string &name, bool is_default = false) : type(type), is_default(is_default), name(name) {}
@@ -813,8 +801,6 @@ public:
    // Return number of presets including the "- default -" preset.
    size_t          size() const                { return m_presets.size(); }
    bool            has_defaults_only() const   { return m_presets.size() <= m_num_default_presets; }
-    // How many presets this collection refused or repaired while loading.
-    int             error_count() const         { return m_errors; }

    // For Print / Filament presets, disable those, which are not compatible with the printer.
    template<typename PreferedCondition>
@@ -888,10 +874,8 @@ protected:
    // This is a temporary state, which shall be fixed immediately by the following step.
    bool            select_preset_by_name_strict(const std::string &name);

-    // Move the presets of `others` into this collection in one pass. A name this
-    // collection or an earlier one of `others` already has is left out, and reported
-    // in the list of the collection that repeats it.
-    std::vector<std::vector<std::string>> merge_presets(const std::vector<PresetCollection*> &others, const VendorMap &new_vendors);
+    // Merge one vendor's presets with the other vendor's presets, report duplicates.
+    std::vector<std::string> merge_presets(PresetCollection &&other, const VendorMap &new_vendors);

    // Update m_map_alias_to_profile_name from loaded system profiles.
 	void 			update_map_alias_to_profile_name();
@@ -906,43 +890,6 @@ protected:
    void            set_custom_preset_alias(Preset &preset);

 private:
-    // One preset file read and flattened against the presets already in this
-    // collection, before anything the collection shares has been touched.
-    struct UserPresetLoad
-    {
-        Preset      preset;
-        // Joins the collection. A file that threw partway still joins it, without
-        // the steps that did not run.
-        bool        install { false };
-        // The whole of the load ran, so the preset is ready to be aliased.
-        bool        complete { false };
-        // A filament preset that named no compatible printer and was given one from
-        // its name, which commit writes back to its file.
-        bool        save_compatible_printers { false };
-        // Unreadable, so commit removes it and its .info file.
-        bool        discard_file { false };
-        // The .info file read beside the preset, which commit logs.
-        std::string info_file;
-        // Counted and logged by commit, in the order the directory listed the files.
-        std::vector<std::string>   errors;
-        PresetsConfigSubstitutions substitutions;
-    };
-
-    // Read and flatten one preset file. It reads only, and resolves against the presets
-    // loaded before this pass, never another file of the same pass, so the files of a
-    // pass are independent of each other.
-    UserPresetLoad  resolve_user_preset(const boost::filesystem::path &file, const std::string &canonical_name,
-                                        const PresetOrigin &load_origin, ForwardCompatibilitySubstitutionRule substitution_rule,
-                                        const std::string &extruder_id_name, const std::string &extruder_variant_name,
-                                        std::set<std::string> *key_set1, std::set<std::string> *key_set2) const;
-
-    // Install one resolved preset. The collection, its alias maps, the error count
-    // and the preset files on disk are touched here and only here.
-    void            commit_user_preset(UserPresetLoad &&loaded, std::deque<Preset> &presets_loaded,
-                                       PresetsConfigSubstitutions &substitutions,
-                                       const std::function<void(Preset&)> &preset_loaded_fn,
-                                       bool read_only);
-
    std::string canonical_preset_name(const std::string &name, const PresetOrigin &load_origin = PresetOrigin()) const;

    // Comparator that sorts "Generic " prefixed presets before others, then alphabetically within each group.
@@ -954,10 +901,6 @@ private:
        return a.name < b.name;
    }

-    // Append a preset without keeping the collection sorted, for a caller installing
-    // many at once; find_preset() is unusable until sort_presets() runs.
-    Preset& append_preset(std::string &&path, const std::string &name, DynamicPrintConfig &&config);
-
    // Sort presets: filament presets use generic-first ordering, others sort alphabetically.
    void sort_presets() {
        if (m_type == Preset::TYPE_FILAMENT)
@@ -15,7 +15,6 @@
 #include <unordered_map>
 #include <optional>
 #include <array>
-#include <atomic>
 #include <boost/filesystem/path.hpp>
 #include <unordered_set>

@@ -235,9 +234,6 @@ public:

    // ORCA: utility function to find the vendor for a given preset name
    static std::string find_preset_vendor(const std::string& preset_name, Preset::Type type);
-    // Keys a project keeps when its presets are loaded: those listed in its escaped
-    // "different_settings_to_system" entry for the preset, plus the preset bookkeeping keys.
-    static std::set<std::string> project_different_keys(const std::string &different_settings);

    PresetBundle();
    PresetBundle(const PresetBundle &rhs);
@@ -277,10 +273,6 @@ public:
                                    const std::string &source_file,
                                    ForwardCompatibilitySubstitutionRule compatibility_rule,
                                    std::string &error, bool allow_source_manifest = true);
-    // Resolve a system preset by name. The vendor tree is read from data_dir()/system when installed
-    // there, as the GUI reads it, and from the bundled profiles otherwise.
-    bool resolve_system_preset(DynamicPrintConfig &config, Preset::Type type, const std::string &name,
-                               ForwardCompatibilitySubstitutionRule compatibility_rule, std::string &error);

    // Load selections (current print, current filaments, current printer) from config.ini
    // This is done just once on application start up.
@@ -630,180 +622,36 @@ public:
    // default_filament_profile must resolve to a system filament.
    bool check_printer_default_materials() const;

-    // One vendor to load, and the directory it is installed in.
-    struct VendorSource
-    {
-        std::string             name;
-        boost::filesystem::path dir;
-    };
-
-    // Load `vendors` into this bundle, the Orca filament library directly and every
-    // other vendor in parallel into a bundle of its own that inherits from it, merged
-    // in the order given. A vendor that cannot be loaded has its error added to the
-    // returned text, or thrown in validation mode, and its name to `failed`; it is
-    // left out, except for the library, which keeps what it installed before the
-    // failure. Once `cancel` is set, no further vendor starts loading.
-    std::pair<PresetsConfigSubstitutions, std::string> load_vendors(const std::vector<VendorSource>& vendors,
-        ForwardCompatibilitySubstitutionRule compatibility_rule, bool allow_cache,
-        const std::atomic<bool>* cancel = nullptr, std::vector<std::string>* failed = nullptr);
+    // Merge one vendor's presets with the other vendor's presets, report duplicates.
+    // Public so per-vendor-cache consumers (e.g. the setup wizard) can assemble a
+    // bundle out of several per-vendor caches loaded into separate PresetBundle instances.
+    std::vector<std::string>    merge_presets(PresetBundle &&other);

 private:
-    // Move the presets and vendor profiles of `others` into this bundle, in one pass
-    // over each collection. A preset whose name this bundle or an earlier one of
-    // `others` already has is left out and listed under the bundle that repeats it.
-    std::vector<std::vector<std::string>> merge_presets(const std::vector<PresetBundle*> &others);
+    // Load one vendor from the preset cache installed in `dir`, judged against
+    // the vendor profile there. False, with this bundle left clean, when there
+    // is no usable cache and the vendor has to be parsed. This is how
+    // load_vendor_configs_from_json reads a cache.
+    bool load_vendor_cache(const boost::filesystem::path& dir, const std::string& vendor_name, const PresetBundle* base_bundle);

-    // What parsing one entry's JSON sub-file reported. Its errors and warnings are
-    // logged when the entry installs, so they come out in listing order with the
-    // entry's install errors, as parsing and installing one entry at a time leaves them.
-    struct EntryParse
-    {
-        ConfigSubstitutions      substitutions;
-        // Counted in the bundle's error count.
-        std::vector<std::string> errors;
-        std::vector<std::string> warnings;
-    };
-
-    // An EntryParse for each entry of the VendorCacheData list of the same name.
-    struct VendorParse
-    {
-        std::vector<EntryParse> process_entries;
-        std::vector<EntryParse> filament_entries;
-        std::vector<EntryParse> machine_entries;
-    };
-
-    // One vendor read from its cache or its JSONs by read_vendor, for
-    // install_vendor_read to install.
-    struct VendorRead
-    {
-        std::string                          dir;
-        std::string                          vendor_name;
-        LoadConfigBundleAttributes           flags;
-        ForwardCompatibilitySubstitutionRule compatibility_rule;
-        // The errors this bundle had counted before the read, which the cache stamp leaves out.
-        int                                  errors_at_entry { 0 };
-        // A whole-vendor load, which can read a cache and write one.
-        bool                                 cacheable { false };
-        // Read from the cache at cache_path, which install can still reject.
-        bool                                 from_cache { false };
-        std::string                          cache_path;
-        // Only the vendor profile was asked for.
-        bool                                 vendor_only { false };
-        VendorCacheData                      data;
-        // What each entry's JSON parse reported, and whether and with which version
-        // the cache is written once the entries install.
-        VendorParse                          parsed;
-        bool                                 will_cache { false };
-        std::string                          version;
-        // The sub-file the parse stopped at, its kind, why, and the errors it reported.
-        std::string                          reason;
-        std::string                          failed_subfile;
-        const char*                          failed_kind { nullptr };
-        std::vector<std::string>             failed_errors;
-    };
-
-    // Read a vendor into this bundle's vendor profiles and `data`, from its cache
-    // when one covers it, else from its JSONs; nothing is installed. Throws
-    // ConfigurationError when the vendor's own JSON cannot be parsed.
-    VendorRead read_vendor(const std::string& dir, const std::string& vendor_name, LoadConfigBundleAttributes flags,
-                           ForwardCompatibilitySubstitutionRule compatibility_rule, bool allow_cache);
-
-    // Parse the vendor's JSONs into `read`, up to the first sub-file that fails.
-    void parse_vendor_json(VendorRead& read);
-
-    // Install what read_vendor read, against base_bundle's filament library. A cache
-    // that cannot be installed is replaced by a parse of the JSONs. Throws
-    // ConfigurationError at the first entry that cannot be installed, or after
-    // installing the entries before a sub-file that could not be parsed.
-    std::pair<PresetsConfigSubstitutions, size_t> install_vendor_read(VendorRead&& read, const PresetBundle* base_bundle);
-
-    // Install a cache's entries. False, with this bundle left clean, when one of them
-    // cannot be installed.
-    bool install_vendor_cache(const std::string& cache_path, const std::string& vendor_name, VendorCacheData&& data,
-                              const PresetBundle* base_bundle);
-
-    // Log and count errors reported by a resolve or a parse.
-    void log_errors(const std::vector<std::string>& errors);
-
-    // The state of installing one collection of one vendor, which
-    // resolve_vendor_preset reads through a const reference and only
-    // commit_vendor_preset writes.
-    struct VendorInstall
-    {
-        // The directory holding <vendor_name>/, whose sub-paths the entries name.
-        std::string                path;
-        std::string                vendor_name;
-        const VendorProfile*       vendor_profile;
-        const PresetBundle*        base_bundle;
-        LoadConfigBundleAttributes flags;
-        PresetCollection*          presets;
-        // The Orca filament library, which keeps every config for other vendors to
-        // resolve against.
-        bool                       is_from_lib;
-        PresetsConfigSubstitutions* substitutions;
-        // The names some entry inherits / includes, the only ones whose configs /
-        // include diffs are looked up again.
-        std::set<std::string>      inherited;
-        std::set<std::string>      included;
-        std::map<std::string, DynamicPrintConfig> config_maps;
-        std::map<std::string, DynamicPrintConfig> include_maps;
-        std::map<std::string, std::string>        filament_id_maps;
-        std::unordered_set<std::string>           installed_names;
-        size_t                     count { 0 };
-    };
-
-    // Install a vendor's source-form entries, parsed from its JSON or read from its
-    // cache: processes, then filaments, then printers. Both loads go through here,
-    // so a cache-loaded bundle cannot come out different from a JSON-loaded one.
-    // `parsed` is given for entries parsed just now. `complete` says the entries
-    // are the vendor's whole lists; only then are the filament library's configs
-    // and filament ids left in m_config_maps and m_filament_id_maps. Returns the
-    // number of presets installed, and throws ConfigurationError at the first
-    // entry that cannot be installed.
-    size_t install_vendor(const std::string& path, const std::string& vendor_name, const PresetBundle* base_bundle,
-                          LoadConfigBundleAttributes flags, const VendorCacheData& entries,
-                          VendorParse* parsed, bool complete, PresetsConfigSubstitutions& substitutions);
-
-    // Install one collection's entries in the order they are listed.
-    void install_vendor_entries(VendorInstall& install, const std::vector<CachedPreset>& entries,
-                                std::vector<EntryParse>* parsed);
-
-    // One entry flattened against the preset it inherits, before anything this
-    // bundle shares has been touched.
-    struct PresetInstall
-    {
-        DynamicPrintConfig       config;
-        std::string              file_path;
-        // Empty when the preset is its own alias.
-        std::string              alias;
-        std::string              filament_id;
-        std::vector<std::string> renamed_from;
-        // Reported by commit, so resolving entries together leaves the log and
-        // the error count as one entry at a time produces them.
-        std::vector<std::string> errors;
-        // What a base states for the presets that include it, when it is retained.
-        std::optional<DynamicPrintConfig> included;
-        // The config kept for the entries that inherit this one, or for other
-        // vendors when this is the filament library.
-        std::optional<DynamicPrintConfig> retained;
-        // Not instantiated, so it contributes a config and no preset.
-        bool                     config_only { false };
-        // Non-empty when the entry is rejected, and says why.
-        std::string              reason;
-    };
-
-    // Flatten one entry against the config it inherits, from this collection's
-    // config_maps or base_bundle's filament library, with the include diffs it
-    // names layered in. It looks up nothing but the names the entry inherits and
-    // includes, and writes nothing.
-    PresetInstall resolve_vendor_preset(const CachedPreset& entry, const VendorInstall& install) const;
-
-    // Install a resolved entry. The collections, the maps in `install` and the
-    // error count are touched here and only here, one entry at a time.
-    // Presets are appended, so a repeated name is caught with `installed_names`,
-    // and the collection is sorted once every entry is in.
-    std::string commit_vendor_preset(const CachedPreset& entry, PresetInstall&& resolved,
-                                     ConfigSubstitutions&& substitutions, VendorInstall& install);
+    // Load one source-form preset entry into this bundle: resolve `inherits`
+    // and `include`, flatten, validate and register the preset. Returns the
+    // reason loading failed, empty on success. See the definition for the
+    // sharing contract between the JSON parse and the cache load.
+    // retain_configs / retain_includes, when non-null, name the only presets
+    // registered into config_maps / include_maps (a config copy each). The
+    // cache load passes the names its entries inherit / include — the only
+    // ones ever looked up again; the JSON parse retains all, not knowing what
+    // later subfiles name.
+    std::string load_vendor_preset(const CachedPreset& entry,
+        const std::string& path, const std::string& vendor_name,
+        const PresetBundle* base_bundle,
+        LoadConfigBundleAttributes flags,
+        ConfigSubstitutionContext& substitution_context, PresetsConfigSubstitutions& substitutions,
+        std::map<std::string, DynamicPrintConfig>& config_maps, std::map<std::string, DynamicPrintConfig>& include_maps,
+        std::map<std::string, std::string>& filament_id_maps,
+        PresetCollection* presets_collection, size_t& count, bool is_from_lib,
+        const std::set<std::string>* retain_configs = nullptr, const std::set<std::string>* retain_includes = nullptr);

    // Clear every collection's m_printer_hold_alias, which reset() leaves alone.
    void clear_printer_hold_aliases();
@@ -815,14 +663,13 @@ private:
    // Vendor trees loaded by resolve_preset_config's manifest path, so every preset
    // resolved through this bundle shares one load per source root and vendor. The
    // filament library is one such tree, shared by every vendor under its root.
-    // A tree read from its preset cache is kept apart: its presets carry no source file.
-    std::map<std::tuple<std::string, std::string, ForwardCompatibilitySubstitutionRule, bool>, std::unique_ptr<PresetBundle>>
+    std::map<std::tuple<std::string, std::string, ForwardCompatibilitySubstitutionRule>, std::unique_ptr<PresetBundle>>
        m_source_vendor_bundles;

    const PresetBundle *load_source_vendor(const boost::filesystem::path &root_dir,
                                           const std::string &vendor_id,
                                           ForwardCompatibilitySubstitutionRule compatibility_rule,
-                                           std::string &error, bool allow_cache = false);
+                                           std::string &error);

    // Orca: validation only - flag any printer with two or more compatible
    // filament presets sharing one filament_id (ambiguous AMS subtype match).
@@ -109,7 +109,7 @@ void skip_config(cereal::BinaryInputArchive& ar, const CacheDictionary& dict);

 // One preset as its JSON subfile states it: the config diff, the names of the
 // preset it inherits and the presets it includes, and the parse metadata —
-// everything PresetBundle::parse_vendor_json extracts and
+// everything the parse phase of load_vendor_configs_from_json extracts and
 // nothing it derives. Inheritance and includes are resolved when the entry is
 // installed, against whatever filament library is loaded then, so a cache
 // carries no other vendor's values and no other vendor's update can make it
@@ -2439,18 +2439,12 @@ StringObjectException Print::validate(std::vector<StringObjectException> *warnin
            if (m_default_region_config.precise_outer_wall && m_default_region_config.wall_sequence != WallSequence::InnerOuter)
                warn(L("The precise wall option will be ignored for outer-inner or inner-outer-inner wall sequences."), "precise_outer_wall");

-            // check adaptive pressure advance model of every extruder variant column of the used filaments
-            const std::vector<int> &self_index = m_config.filament_self_index.values;
-            const size_t pa_columns = std::max(m_config.adaptive_pressure_advance_model.size(), size_t(extruders.back()) + 1);
-            for (size_t column = 0; column < pa_columns; ++column) {
-                // filament_self_index maps a column to its filament once the filament arrays hold one column per variant
-                const unsigned int filament_id = self_index.size() == pa_columns ? self_index[column] - 1 : column;
-                if (!std::binary_search(extruders.begin(), extruders.end(), filament_id))
-                    continue;
-                if (m_config.adaptive_pressure_advance.get_at(column) &&
-                    m_config.enable_pressure_advance.get_at(column)) {
+            // check adaptive pressure advance model
+            for (unsigned int extruder_id : extruders) {
+                if (m_config.adaptive_pressure_advance.get_at(extruder_id) && 
+                    m_config.enable_pressure_advance.get_at(extruder_id)) {
                    
-                    const std::string pa_model = m_config.adaptive_pressure_advance_model.get_at(column);
+                    const std::string pa_model = m_config.adaptive_pressure_advance_model.get_at(extruder_id);
                    if (!pa_model.empty()) {
                        std::string validation_error = AdaptivePAProcessor::validate_adaptive_pa_model(pa_model);
                        if (!validation_error.empty()) {
@@ -9403,10 +9403,6 @@ void PrintConfigDef::handle_legacy_composite(DynamicPrintConfig &config)
        }
        config.set_key_value("wiping_volumes_use_custom_matrix", new ConfigOptionBool(custom));
    }
-
-    // Orca: a config saved before a key joined filament_options_with_variant stores it once per filament
-    // rather than once per filament variant, and one exported by an older CLI may store a single value.
-    normalize_filament_values_to_variants(config);
 }

 const PrintConfigDef print_config_def;
@@ -9509,13 +9505,6 @@ std::set<std::string> filament_options_with_variant = {
    "filament_ironing_spacing",
    "filament_ironing_inset",
    "filament_ironing_speed",
-    // Orca: pressure advance
-    "enable_pressure_advance",
-    "pressure_advance",
-    "adaptive_pressure_advance",
-    "adaptive_pressure_advance_model",
-    "adaptive_pressure_advance_overhangs",
-    "adaptive_pressure_advance_bridges",
    "activate_air_filtration",
    "activate_air_filtration_during_print",
    "activate_air_filtration_on_completion",
@@ -10723,25 +10712,6 @@ void set_variant_override(ConfigOptionVectorBase &target, const ConfigOptionVect
    target.set_to_index(&source, indices, stride);
 }

-void normalize_filament_values_to_variants(DynamicPrintConfig &config)
-{
-    const auto *self_index = config.option<ConfigOptionInts>("filament_self_index");
-    if (self_index == nullptr || self_index->empty())
-        return;
-    const int filament_count = *std::max_element(self_index->values.begin(), self_index->values.end());
-    if (filament_count <= 0 || size_t(filament_count) >= self_index->size())
-        return;
-    for (const std::string &key : filament_options_with_variant) {
-        auto *opt = dynamic_cast<ConfigOptionVectorBase *>(config.option(key));
-        if (opt == nullptr || (opt->size() != size_t(filament_count) && opt->size() != 1))
-            continue;
-        std::unique_ptr<ConfigOption> per_filament(opt->clone());
-        // set_at() takes the first value for a filament past the end of a single-value vector
-        for (size_t variant = 0; variant < self_index->size(); ++variant)
-            opt->set_at(per_filament.get(), variant, self_index->values[variant] - 1);
-    }
-}
-

 //used for object/region config
 //use the smallest of multiple to single
@@ -12595,7 +12565,6 @@ OtherSlicingStatesConfigDef::OtherSlicingStatesConfigDef()

    new_def("initial_no_support_extruder", coInt, "Initial no support extruder", "Zero-based index of the first extruder used for printing without support. Same as initial_no_support_tool.");
    new_def("in_head_wrap_detect_zone", coBool, "In head wrap detect zone", "Indicates if the first layer overlaps with the head wrap zone.");
-    new_def("curr_bed_type", coString, "Current bed type", "Name of the currently selected bed plate type (e.g. 'Textured PEI Plate', 'Smooth High Temp Plate').");
 }

 PrintStatisticsConfigDef::PrintStatisticsConfigDef()
@@ -884,11 +884,6 @@ extern std::set<std::string> empty_options;
 void set_variant_override(ConfigOptionVectorBase &target, const ConfigOptionVectorBase &source,
                          const std::vector<int> &variant_index, int stride = 1);

-// Orca: lays every filament_options_with_variant option out one value per filament variant, as
-// filament_self_index maps the variants to filaments. An option holding one value per filament, or a
-// single value, gives every variant of a filament that filament's value; other lengths are left alone.
-void normalize_filament_values_to_variants(DynamicPrintConfig &config);
-
 extern std::set<std::string> filament_dev_options;

 extern void update_static_print_config_from_dynamic(ConfigBase& config, const DynamicPrintConfig& dest_config, std::vector<int> variant_index, std::set<std::string>& key_set1, int stride = 1);
@@ -256,19 +256,10 @@ extern bool is_gallery_file(const std::string& path, char const* type);
 extern bool is_shapes_dir(const std::string& dir);
 //BBS: add json support
 extern bool is_json_file(const std::string& path);
-// True if rel_path is relative, has no ".." component or embedded NUL and, joined to root, still resolves inside it.
+// True if rel_path is relative, has no ".." component and, joined to root, still resolves inside it.
 // Both '/' and '\\' are treated as separators on every platform, so an archive rejected on one OS
 // is rejected on all of them.
 extern bool is_path_within_root(const std::string &rel_path, const boost::filesystem::path &root);
-// True if a symlink stored at link_rel_path (relative to root) with this target stays inside root: the target
-// must be relative, and joined to the link's directory it must pass is_path_within_root.
-extern bool is_symlink_target_within_root(const std::string &link_rel_path, const std::string &target, const boost::filesystem::path &root);
-// True if path names an entry strictly inside root: it must be spelled with root as its prefix,
-// and must still resolve inside root once symlinks are followed.
-extern bool is_absolute_path_within_root(const boost::filesystem::path &path, const boost::filesystem::path &root);
-// True if a file with this name is of a type that the desktop opens as plain content, so it cannot run code.
-// Anything unknown is not safe.
-extern bool is_safe_to_open_file_name(const std::string &file_name);

 // Orca: custom protocal support utils
 inline bool is_orca_open(const std::string& url) { return boost::starts_with(url, "orcaslicer://open"); }
@@ -4,9 +4,6 @@
 #include "miniz_extension.hpp"
 #include "Utils.hpp"

-#include <boost/filesystem.hpp>
-#include <boost/log/trivial.hpp>
-
 #if defined(_MSC_VER) || defined(__MINGW64__)
 #include "boost/nowide/cstdio.hpp"
 #endif
@@ -118,66 +115,6 @@ std::string decode_archive_entry_path(mz_zip_archive *zip, const mz_zip_archive_
    return decode_zip_unicode_path_extra_field(extra.substr(0, extra_size > 0 ? extra_size - 1 : 0), stat.m_filename);
 }

-bool extract_archive_confined(const std::string &zip_path_utf8, const std::string &dest_dir)
-{
-    mz_zip_archive archive;
-    mz_zip_zero_struct(&archive);
-
-    if (!open_zip_reader(&archive, zip_path_utf8)) {
-        BOOST_LOG_TRIVIAL(error) << "Unable to open zip reader for " << zip_path_utf8;
-        return false;
-    }
-
-    const mz_uint num_entries = mz_zip_reader_get_num_files(&archive);
-    mz_zip_archive_file_stat stat;
-
-    // Validate every entry first so an archive with a single escaping entry leaves no partial output behind.
-    const boost::filesystem::path root(dest_dir);
-    for (mz_uint i = 0; i < num_entries; ++i) {
-        if (mz_zip_reader_file_stat(&archive, i, &stat) && !is_path_within_root(stat.m_filename, root)) {
-            BOOST_LOG_TRIVIAL(error) << "Unzip: rejecting " << zip_path_utf8 << ", entry " << stat.m_filename << " resolves outside " << dest_dir;
-            close_zip_reader(&archive);
-            return false;
-        }
-    }
-
-    for (mz_uint i = 0; i < num_entries; ++i) {
-        if (!mz_zip_reader_file_stat(&archive, i, &stat)) {
-            BOOST_LOG_TRIVIAL(warning) << "Unzip: read file stat failed";
-            continue;
-        }
-        const std::string dest_file = dest_dir + "/" + stat.m_filename;
-        try {
-            if (stat.m_is_directory) {
-                const boost::filesystem::path dest_path(dest_file);
-                if (!boost::filesystem::exists(dest_path))
-                    boost::filesystem::create_directories(dest_path);
-                continue;
-            }
-            if (stat.m_uncomp_size == 0) {
-                BOOST_LOG_TRIVIAL(warning) << "Unzip: invalid size for file " << stat.m_filename;
-                continue;
-            }
-            // Replace a symlink at the destination rather than writing through it.
-            const boost::filesystem::path dest_path(dest_file);
-            if (boost::filesystem::is_symlink(boost::filesystem::symlink_status(dest_path)))
-                boost::filesystem::remove(dest_path);
-            if (!mz_zip_reader_extract_to_file(&archive, stat.m_file_index, dest_file.c_str(), 0)) {
-                BOOST_LOG_TRIVIAL(error) << "Unzip: extract file " << stat.m_filename << " to dest " << dest_file << " failed";
-                close_zip_reader(&archive);
-                return false;
-            }
-            BOOST_LOG_TRIVIAL(info) << "Unzip: successfully extract file " << stat.m_file_index << " to " << dest_file;
-        } catch (const std::exception &e) {
-            close_zip_reader(&archive);
-            BOOST_LOG_TRIVIAL(error) << "Unzip: archive read exception: " << e.what();
-            return false;
-        }
-    }
-    close_zip_reader(&archive);
-    return true;
-}
-
 MZ_Archive::MZ_Archive()
 {
    mz_zip_zero_struct(&arch);
@@ -11,8 +11,6 @@ bool open_zip_writer(mz_zip_archive *zip, const std::string &fname_utf8);
 bool close_zip_reader(mz_zip_archive *zip);
 bool close_zip_writer(mz_zip_archive *zip);
 std::string decode_archive_entry_path(mz_zip_archive *zip, const mz_zip_archive_file_stat &stat);
-// Extracts every entry of the archive under dest_dir. Nothing is written if any entry would resolve outside dest_dir.
-bool extract_archive_confined(const std::string &zip_path_utf8, const std::string &dest_dir);

 class MZ_Archive {
 public:
@@ -70,7 +70,6 @@
 #include <boost/shared_ptr.hpp>

 #include <boost/algorithm/string/predicate.hpp>
-#include <boost/algorithm/string/case_conv.hpp>
 #include <boost/filesystem.hpp>
 #include <boost/filesystem/path.hpp>
 #include <boost/nowide/fstream.hpp>
@@ -1094,9 +1093,6 @@ bool is_path_within_root(const std::string &rel_path, const boost::filesystem::p
    auto is_separator = [](char c) { return c == '/' || c == '\\'; };
    if (rel_path.empty() || is_separator(rel_path.front()) || (rel_path.size() > 1 && rel_path[1] == ':'))
        return false;
-    // The filesystem calls stop at a NUL, so they would act on a shorter path than the one checked here.
-    if (rel_path.find('\0') != std::string::npos)
-        return false;
    for (size_t start = 0; start <= rel_path.size();) {
        size_t end = start;
        while (end < rel_path.size() && !is_separator(rel_path[end]))
@@ -1107,10 +1103,7 @@ bool is_path_within_root(const std::string &rel_path, const boost::filesystem::p
    }
    // Resolve against the canonical root so a symlink inside it cannot lead back out.
    try {
-        std::string root_str = boost::filesystem::weakly_canonical(root).string();
-        // A trailing separator on root would otherwise fail the prefix match below for every path.
-        while (!root_str.empty() && (root_str.back() == '/' || root_str.back() == boost::filesystem::path::preferred_separator))
-            root_str.pop_back();
+        const std::string root_str = boost::filesystem::weakly_canonical(root).string();
        const std::string full_str = boost::filesystem::weakly_canonical(root / rel_path).string();
        return full_str.compare(0, root_str.size(), root_str) == 0 &&
               (full_str.size() == root_str.size() || full_str[root_str.size()] == boost::filesystem::path::preferred_separator);
@@ -1119,37 +1112,6 @@ bool is_path_within_root(const std::string &rel_path, const boost::filesystem::p
    }
 }

-bool is_symlink_target_within_root(const std::string &link_rel_path, const std::string &target, const boost::filesystem::path &root)
-{
-    if (target.empty() || target.front() == '/' || target.front() == '\\' || (target.size() > 1 && target[1] == ':'))
-        return false;
-    // A relative target without ".." only descends from the link's directory, so no chain of such links can leave root.
-    const size_t sep = link_rel_path.find_last_of("/\\");
-    return is_path_within_root((sep == std::string::npos ? std::string() : link_rel_path.substr(0, sep + 1)) + target, root);
-}
-
-bool is_absolute_path_within_root(const boost::filesystem::path &path, const boost::filesystem::path &root)
-{
-    const boost::filesystem::path rel = path.lexically_relative(root);
-    return !rel.empty() && rel != "." && is_path_within_root(rel.string(), root);
-}
-
-bool is_safe_to_open_file_name(const std::string &file_name)
-{
-    // Formats that cannot carry macros or scripts. Legacy and OpenDocument office files, HTML and SVG are left out on purpose.
-    static const std::vector<std::string> safe_extensions = {
-        "jpg", "jpeg", "jfif", "pjpeg", "pjp", "png", "gif", "bmp", "webp", "tif", "tiff",
-        "pdf", "txt", "md", "csv", "docx", "xlsx", "pptx",
-        "stl", "obj", "3mf", "amf", "ply", "step", "stp", "iges", "igs", "dxf",
-        "mp4", "mov", "webm"};
-    // The name must end in the extension itself: Windows drops trailing dots and spaces and reads ':' as a stream separator.
-    const size_t dot = file_name.find_last_of('.');
-    if (dot == std::string::npos || file_name.find_first_of("/\\:") != std::string::npos)
-        return false;
-    const std::string extension = boost::algorithm::to_lower_copy(file_name.substr(dot + 1));
-    return std::find(safe_extensions.begin(), safe_extensions.end(), extension) != safe_extensions.end();
-}
-
 bool is_img_file(const std::string &path)
 {
 	return boost::iends_with(path, ".png") || boost::iends_with(path, ".svg");
@@ -158,6 +158,21 @@ enum class EGCodeExtrusionRole : uint8_t

 static constexpr std::size_t GCODE_EXTRUSION_ROLES_COUNT = static_cast<std::size_t>(EGCodeExtrusionRole::COUNT);

+//
+// What the reduced set, drawn while the user is dragging, holds in place of the full toolpaths
+//
+enum class EReducedDetailMode : uint8_t
+{
+    // nothing: no reduced set is built
+    Off,
+    // only the bottom and top layers of the visible range, for a caller that draws the print
+    // itself some other way
+    EndLayersOnly,
+    // every role but the infill under the skins and the gap fill: what can be seen from outside
+    ShellOnly,
+    COUNT
+};
+
 //
 // Option types
 //
@@ -114,6 +114,19 @@ public:
    //
    bool is_dim_previous_layers() const;
    void set_dim_previous_layers(bool value);
+    //
+    // The reduced set drawn while the user drags: what the mode keeps, and always the bottom and
+    // top layers of the visible range. While a mode is set it is built alongside the full set, so
+    // set_reduced_detail() rebuilds nothing. Ignored on the OpenGL ES path.
+    //
+    EReducedDetailMode get_reduced_detail_mode() const;
+    void set_reduced_detail_mode(EReducedDetailMode mode);
+    // Whether the shell mode hides the infill roles; off for a profile that leaves them on the
+    // surface, with no top or bottom shell or no walls.
+    bool get_reduced_detail_hide_infill() const;
+    void set_reduced_detail_hide_infill(bool value);
+    void set_reduced_detail(bool value);
+    bool is_reduced_detail() const;
    float get_dim_previous_layers_brightness() const;
    void set_dim_previous_layers_brightness(float value);
    //
@@ -25,6 +25,11 @@ struct Settings
 		// ORCA: how bright those darkened layers are rendered, 1.0 = unchanged, 0.0 = black
 		float dim_previous_layers_brightness{ 0.4f };
 		bool spiral_vase_mode{ false };
+		// what the reduced set holds and whether it is drawn. Ignored on the OpenGL ES path.
+		EReducedDetailMode reduced_detail_mode{ EReducedDetailMode::Off };
+		// whether the shell mode may hide the infill roles: false when the profile leaves them on the surface
+		bool reduced_detail_hide_infill{ true };
+		bool reduced_detail{ false };
 		//
 		// Required update flags
 		//
@@ -92,6 +92,36 @@ bool Viewer::is_dim_previous_layers() const
    return m_impl->is_dim_previous_layers();
 }

+void Viewer::set_reduced_detail(bool value)
+{
+    m_impl->set_reduced_detail(value);
+}
+
+bool Viewer::is_reduced_detail() const
+{
+    return m_impl->is_reduced_detail();
+}
+
+EReducedDetailMode Viewer::get_reduced_detail_mode() const
+{
+    return m_impl->get_reduced_detail_mode();
+}
+
+void Viewer::set_reduced_detail_mode(EReducedDetailMode mode)
+{
+    m_impl->set_reduced_detail_mode(mode);
+}
+
+bool Viewer::get_reduced_detail_hide_infill() const
+{
+    return m_impl->get_reduced_detail_hide_infill();
+}
+
+void Viewer::set_reduced_detail_hide_infill(bool value)
+{
+    m_impl->set_reduced_detail_hide_infill(value);
+}
+
 void Viewer::set_dim_previous_layers(bool value)
 {
    m_impl->set_dim_previous_layers(value);
@@ -17,6 +17,7 @@
 #include <algorithm>
 #include <cmath>
 #include <numeric>
+#include <cfloat>

 namespace libvgcode {

@@ -901,9 +902,17 @@ void ViewerImpl::reset()
 #else
    m_enabled_segments_count = 0;
    m_enabled_options_count = 0;
+    m_enabled_segments_reduced_count = 0;
+    m_enabled_options_reduced_count = 0;
+    m_enabled_segments_reduced_tex_size = 0;
+    m_enabled_options_reduced_tex_size = 0;

    m_settings_used_for_ranges = std::nullopt;

+    delete_textures(m_enabled_options_reduced_tex_id);
+    delete_buffers(m_enabled_options_reduced_buf_id);
+    delete_textures(m_enabled_segments_reduced_tex_id);
+    delete_buffers(m_enabled_segments_reduced_buf_id);
    delete_textures(m_enabled_options_tex_id);
    delete_buffers(m_enabled_options_buf_id);
    delete_textures(m_enabled_segments_tex_id);
@@ -1163,6 +1172,17 @@ void ViewerImpl::load(GCodeInputData&& gcode_data)
        glsafe(glGenTextures(1, &m_enabled_options_tex_id));
        glsafe(glBindTexture(GL_TEXTURE_BUFFER, m_enabled_options_tex_id));

+        // create (but do not fill) the reduced counterparts of the two buffers above
+        glsafe(glGenBuffers(1, &m_enabled_segments_reduced_buf_id));
+        glsafe(glBindBuffer(GL_TEXTURE_BUFFER, m_enabled_segments_reduced_buf_id));
+        glsafe(glGenTextures(1, &m_enabled_segments_reduced_tex_id));
+        glsafe(glBindTexture(GL_TEXTURE_BUFFER, m_enabled_segments_reduced_tex_id));
+
+        glsafe(glGenBuffers(1, &m_enabled_options_reduced_buf_id));
+        glsafe(glBindBuffer(GL_TEXTURE_BUFFER, m_enabled_options_reduced_buf_id));
+        glsafe(glGenTextures(1, &m_enabled_options_reduced_tex_id));
+        glsafe(glBindTexture(GL_TEXTURE_BUFFER, m_enabled_options_reduced_tex_id));
+
        glsafe(glBindBuffer(GL_TEXTURE_BUFFER, 0));
        glsafe(glBindTexture(GL_TEXTURE_BUFFER, old_bound_texture));
 #endif // ENABLE_OPENGL_ES
@@ -1174,6 +1194,18 @@ void ViewerImpl::load(GCodeInputData&& gcode_data)
    update_colors();
 }

+#ifndef ENABLE_OPENGL_ES
+// the roles that lie under a skin or between walls, never seen from outside the print
+static bool is_hidden_in_shell(EGCodeExtrusionRole role)
+{
+    return role == EGCodeExtrusionRole::InternalInfill ||
+           role == EGCodeExtrusionRole::SolidInfill ||
+           role == EGCodeExtrusionRole::InternalBridgeInfill ||
+           role == EGCodeExtrusionRole::GapFill;
+}
+#endif // ENABLE_OPENGL_ES
+
+
 void ViewerImpl::update_enabled_entities()
 {
    if (m_vertices.empty())
@@ -1181,6 +1213,17 @@ void ViewerImpl::update_enabled_entities()

    std::vector<uint32_t> enabled_segments;
    std::vector<uint32_t> enabled_options;
+#ifndef ENABLE_OPENGL_ES
+    // the reduced set is filled by the same walk, so switching to it costs no rebuild. Whatever the
+    // mode leaves out, the bottom and top layers of the visible range are kept whole: they are the
+    // surfaces the range cuts open
+    const EReducedDetailMode reduced_mode = m_settings.reduced_detail_mode;
+    const bool build_reduced = reduced_mode != EReducedDetailMode::Off;
+    const bool hide_infill = m_settings.reduced_detail_hide_infill;
+    std::vector<uint32_t> enabled_segments_reduced;
+    std::vector<uint32_t> enabled_options_reduced;
+    const Interval& layers_range = m_layers.get_view_range();
+#endif // ENABLE_OPENGL_ES
    Interval range = m_view_range.get_visible();

    // when top layer only visualization is enabled, we need to render
@@ -1228,6 +1271,20 @@ void ViewerImpl::update_enabled_entities()
            enabled_options.push_back(static_cast<uint32_t>(i));
        else
            enabled_segments.push_back(static_cast<uint32_t>(i));
+
+#ifndef ENABLE_OPENGL_ES
+        if (build_reduced) {
+            const bool end_layer = v.layer_id == layers_range[0] || v.layer_id == layers_range[1];
+            if (end_layer)
+                (v.is_option() ? enabled_options_reduced : enabled_segments_reduced).push_back(static_cast<uint32_t>(i));
+            else if (reduced_mode == EReducedDetailMode::ShellOnly) {
+                if (v.is_option())
+                    enabled_options_reduced.push_back(static_cast<uint32_t>(i));
+                else if (!v.is_extrusion() || !hide_infill || !is_hidden_in_shell(v.role))
+                    enabled_segments_reduced.push_back(static_cast<uint32_t>(i));
+            }
+        }
+#endif // ENABLE_OPENGL_ES
    }

 #ifdef ENABLE_OPENGL_ES
@@ -1256,6 +1313,23 @@ void ViewerImpl::update_enabled_entities()
    else
        glsafe(glBufferData(GL_TEXTURE_BUFFER, 0, nullptr, GL_STATIC_DRAW));

+    m_enabled_segments_reduced_count = enabled_segments_reduced.size();
+    m_enabled_options_reduced_count = enabled_options_reduced.size();
+    m_enabled_segments_reduced_tex_size = enabled_segments_reduced.size() * sizeof(uint32_t);
+    m_enabled_options_reduced_tex_size = enabled_options_reduced.size() * sizeof(uint32_t);
+
+    // uploaded even when nothing was built, so that the last reduced set is released as soon as
+    // the preference is switched off
+    assert(m_enabled_segments_reduced_buf_id > 0);
+    glsafe(glBindBuffer(GL_TEXTURE_BUFFER, m_enabled_segments_reduced_buf_id));
+    glsafe(glBufferData(GL_TEXTURE_BUFFER, m_enabled_segments_reduced_tex_size,
+                        enabled_segments_reduced.empty() ? nullptr : enabled_segments_reduced.data(), GL_STATIC_DRAW));
+
+    assert(m_enabled_options_reduced_buf_id > 0);
+    glsafe(glBindBuffer(GL_TEXTURE_BUFFER, m_enabled_options_reduced_buf_id));
+    glsafe(glBufferData(GL_TEXTURE_BUFFER, m_enabled_options_reduced_tex_size,
+                        enabled_options_reduced.empty() ? nullptr : enabled_options_reduced.data(), GL_STATIC_DRAW));
+
    glsafe(glBindBuffer(GL_TEXTURE_BUFFER, 0));
 #endif // ENABLE_OPENGL_ES

@@ -1463,6 +1537,23 @@ void ViewerImpl::toggle_top_layer_only_view_range()
    update_colors_texture();
 }

+// Both decide which vertices land in the reduced set, so the sets are rebuilt.
+void ViewerImpl::set_reduced_detail_mode(EReducedDetailMode mode)
+{
+    if (m_settings.reduced_detail_mode == mode)
+        return;
+    m_settings.reduced_detail_mode = mode;
+    m_settings.update_enabled_entities = true;
+}
+
+void ViewerImpl::set_reduced_detail_hide_infill(bool value)
+{
+    if (m_settings.reduced_detail_hide_infill == value)
+        return;
+    m_settings.reduced_detail_hide_infill = value;
+    m_settings.update_enabled_entities = true;
+}
+
 // ORCA: enable/disable darkening of the layers the layer slider is not scrubbed to
 void ViewerImpl::set_dim_previous_layers(bool value)
 {
@@ -1856,6 +1947,8 @@ size_t ViewerImpl::get_used_gpu_memory() const
    ret += m_colors_tex_size;
    ret += m_enabled_segments_tex_size;
    ret += m_enabled_options_tex_size;
+    ret += m_enabled_segments_reduced_tex_size;
+    ret += m_enabled_options_reduced_tex_size;
 #endif // ENABLE_OPENGL_ES
    return ret;
 }
@@ -2072,7 +2165,8 @@ void ViewerImpl::render_segments(const Mat4x4& view_matrix, const Mat4x4& projec
 #ifdef ENABLE_OPENGL_ES
    if (m_texture_data.get_enabled_segments_count() == 0)
 #else
-    if (m_enabled_segments_count == 0)
+    const ActiveSet segments = active_segments();
+    if (segments.count == 0)
 #endif // ENABLE_OPENGL_ES
        return;

@@ -2099,7 +2193,7 @@ void ViewerImpl::render_segments(const Mat4x4& view_matrix, const Mat4x4& projec
    const bool top_down = !m_rendering_shadow_casters && view_matrix[10] > 0.0f;
    glsafe(glUniform1i(m_uni_segments_reverse_order_id, top_down ? 1 : 0));
 #ifndef ENABLE_OPENGL_ES
-    glsafe(glUniform1i(m_uni_segments_instance_count_id, static_cast<int>(m_enabled_segments_count)));
+    glsafe(glUniform1i(m_uni_segments_instance_count_id, static_cast<int>(segments.count)));
 #endif // ENABLE_OPENGL_ES
    // ORCA: realistic view. The depth pass writes the map it would otherwise read, so it shades
    // with the lookup off.
@@ -2149,10 +2243,10 @@ void ViewerImpl::render_segments(const Mat4x4& view_matrix, const Mat4x4& projec
    glsafe(glBindTexture(GL_TEXTURE_BUFFER, m_colors_tex_id));
    glsafe(glTexBuffer(GL_TEXTURE_BUFFER, GL_R32F, m_colors_buf_id));
    glsafe(glActiveTexture(GL_TEXTURE3));
-    glsafe(glBindTexture(GL_TEXTURE_BUFFER, m_enabled_segments_tex_id));
-    glsafe(glTexBuffer(GL_TEXTURE_BUFFER, GL_R32UI, m_enabled_segments_buf_id));
+    glsafe(glBindTexture(GL_TEXTURE_BUFFER, segments.tex_id));
+    glsafe(glTexBuffer(GL_TEXTURE_BUFFER, GL_R32UI, segments.buf_id));

-    m_segment_template.render(m_enabled_segments_count);
+    m_segment_template.render(segments.count);
 #endif // ENABLE_OPENGL_ES

    if (curr_cull_face)
@@ -2178,7 +2272,8 @@ void ViewerImpl::render_options(const Mat4x4& view_matrix, const Mat4x4& project
 #ifdef ENABLE_OPENGL_ES
    if (m_texture_data.get_enabled_options_count() == 0)
 #else
-    if (m_enabled_options_count == 0)
+    const ActiveSet options = active_options();
+    if (options.count == 0)
 #endif // ENABLE_OPENGL_ES
        return;

@@ -2236,10 +2331,10 @@ void ViewerImpl::render_options(const Mat4x4& view_matrix, const Mat4x4& project
    glsafe(glBindTexture(GL_TEXTURE_BUFFER, m_colors_tex_id));
    glsafe(glTexBuffer(GL_TEXTURE_BUFFER, GL_R32F, m_colors_buf_id));
    glsafe(glActiveTexture(GL_TEXTURE3));
-    glsafe(glBindTexture(GL_TEXTURE_BUFFER, m_enabled_options_tex_id));
-    glsafe(glTexBuffer(GL_TEXTURE_BUFFER, GL_R32UI, m_enabled_options_buf_id));
+    glsafe(glBindTexture(GL_TEXTURE_BUFFER, options.tex_id));
+    glsafe(glTexBuffer(GL_TEXTURE_BUFFER, GL_R32UI, options.buf_id));

-    m_option_template.render(m_enabled_options_count);
+    m_option_template.render(options.count);
 #endif // ENABLE_OPENGL_ES

    if (!curr_cull_face)
@@ -109,6 +109,21 @@ public:
    // 0.0 = black
    bool is_dim_previous_layers() const { return m_settings.dim_previous_layers; }
    void set_dim_previous_layers(bool value);
+    //
+    // Draw from the reduced set; it is already built, so this is just a buffer binding.
+    //
+    void set_reduced_detail(bool value) {
+#ifdef ENABLE_OPENGL_ES
+        // no reduced set is built on OpenGL ES
+        value = false;
+#endif // ENABLE_OPENGL_ES
+        m_settings.reduced_detail = value;
+    }
+    bool is_reduced_detail() const { return m_settings.reduced_detail; }
+    EReducedDetailMode get_reduced_detail_mode() const { return m_settings.reduced_detail_mode; }
+    void set_reduced_detail_mode(EReducedDetailMode mode);
+    bool get_reduced_detail_hide_infill() const { return m_settings.reduced_detail_hide_infill; }
+    void set_reduced_detail_hide_infill(bool value);
    float get_dim_previous_layers_brightness() const { return m_settings.dim_previous_layers_brightness; }
    void set_dim_previous_layers_brightness(float value);

@@ -501,6 +516,15 @@ private:
    unsigned int m_enabled_options_tex_id{ 0 };
    size_t m_enabled_options_count{ 0 };
    //
+    // OpenGL buffers to store the reduced set drawn while Settings::reduced_detail is set
+    //
+    unsigned int m_enabled_segments_reduced_buf_id{ 0 };
+    unsigned int m_enabled_segments_reduced_tex_id{ 0 };
+    size_t m_enabled_segments_reduced_count{ 0 };
+    unsigned int m_enabled_options_reduced_buf_id{ 0 };
+    unsigned int m_enabled_options_reduced_tex_id{ 0 };
+    size_t m_enabled_options_reduced_count{ 0 };
+    //
    // Caches for size of data sent to gpu, in bytes
    //
    size_t m_positions_tex_size{ 0 };
@@ -508,6 +532,27 @@ private:
    size_t m_colors_tex_size{ 0 };
    size_t m_enabled_segments_tex_size{ 0 };
    size_t m_enabled_options_tex_size{ 0 };
+    size_t m_enabled_segments_reduced_tex_size{ 0 };
+    size_t m_enabled_options_reduced_tex_size{ 0 };
+
+    // The set the next draw reads from: the reduced one while dragging, if one is built.
+    bool use_reduced_set() const { return m_settings.reduced_detail && m_settings.reduced_detail_mode != EReducedDetailMode::Off; }
+    struct ActiveSet
+    {
+        size_t count{ 0 };
+        unsigned int buf_id{ 0 };
+        unsigned int tex_id{ 0 };
+    };
+    ActiveSet active_segments() const {
+        if (use_reduced_set())
+            return { m_enabled_segments_reduced_count, m_enabled_segments_reduced_buf_id, m_enabled_segments_reduced_tex_id };
+        return { m_enabled_segments_count, m_enabled_segments_buf_id, m_enabled_segments_tex_id };
+    }
+    ActiveSet active_options() const {
+        if (use_reduced_set())
+            return { m_enabled_options_reduced_count, m_enabled_options_reduced_buf_id, m_enabled_options_reduced_tex_id };
+        return { m_enabled_options_count, m_enabled_options_buf_id, m_enabled_options_tex_id };
+    }
 #endif // ENABLE_OPENGL_ES

    //
@@ -1019,9 +1019,14 @@ if (UNIX AND NOT APPLE)
    find_package(GTK${SLIC3R_GTK} REQUIRED)
    pkg_check_modules(LIBSECRET REQUIRED libsecret-1)
    pkg_check_modules(webkit2gtk REQUIRED webkit2gtk-4.1)
+    if (FLATPAK)
+        # I don't know why this is needed, but for whatever reason slic3r isn't
+        # linking to X11 and webkit2gtk. force it.
        find_package(X11 REQUIRED)
+        target_link_libraries(libslic3r_gui ${X11_LIBRARIES} ${webkit2gtk_LIBRARIES})
+    endif()
    target_include_directories(libslic3r_gui SYSTEM PRIVATE ${GTK${SLIC3R_GTK}_INCLUDE_DIRS} ${LIBSECRET_INCLUDE_DIRS} ${webkit2gtk_INCLUDE_DIRS})
-    target_link_libraries(libslic3r_gui ${GTK${SLIC3R_GTK}_LIBRARIES} fontconfig ${LIBSECRET_LIBRARIES} ${webkit2gtk_LIBRARIES} ${X11_LIBRARIES})
+    target_link_libraries(libslic3r_gui ${GTK${SLIC3R_GTK}_LIBRARIES} fontconfig ${LIBSECRET_LIBRARIES})

    # Propagate GDK backend detection results as compile definitions so that
    # LinuxDisplayBackend.cpp can include the right GDK headers.
@@ -428,7 +428,7 @@ void AuFile::on_dclick(wxMouseEvent &evt)
    if (m_type == AddFileButton)
        return;
    else
-        desktop_open_project_attachment(this, m_file_path);
+        wxLaunchDefaultApplication(m_file_path.wstring(), 0);
 }

 void AuFile::on_mouse_left_up(wxMouseEvent &evt)
@@ -171,16 +171,14 @@ void ConfigManipulation::check_adaptive_pressure_advance_model(DynamicPrintConfi
        return;

    const auto* model = config->option<ConfigOptionStrings>("adaptive_pressure_advance_model");
-    if (model == nullptr)
+    if (model == nullptr || model->values.empty())
        return;

-    // Each extruder variant holds its own model.
-    std::string error;
-    for (const std::string& variant_model : model->values) {
-        error = AdaptivePAProcessor::validate_adaptive_pa_model(variant_model);
-        if (!error.empty())
-            break;
-    }
+    std::string raw_model;
+    for (const std::string& chunk : model->values)
+        raw_model += chunk;
+
+    std::string error = AdaptivePAProcessor::validate_adaptive_pa_model(raw_model);
    if (!error.empty()) {
        wxString msg_text = _L("Adaptive Pressure Advance model validation failed:\n");
        msg_text += from_u8(error);
@@ -1267,6 +1267,8 @@ void GCodeViewer::load_as_gcode(const GCodeProcessorResult& gcode_result, const
    if (current_top_layer_only != required_top_layer_only)
        m_viewer.toggle_top_layer_only_view_range();

+    read_reduced_detail_preferences();
+
    // ORCA: darken the layers the preview layer slider is not scrubbed to
    m_viewer.set_dim_previous_layers(get_app_config()->get_bool("preview_dim_previous_layers"));
    m_viewer.set_dim_previous_layers_brightness(0.01f * std::stoi(get_app_config()->get("preview_dim_previous_layers_brightness")));
@@ -1491,6 +1493,10 @@ void GCodeViewer::load_as_gcode(const GCodeProcessorResult& gcode_result, const

    // BBS: data for rendering color arrangement recommendation
    m_nozzle_nums = print.config().option<ConfigOptionFloats>("nozzle_diameter")->values.size();
+    // the shell drag mode hides the infill only where the profile covers it: with no top or bottom
+    // shell, or no walls, the infill is the surface. Per-object settings are not consulted.
+    const PrintRegionConfig& region = print.default_region_config();
+    m_viewer.set_reduced_detail_hide_infill(region.top_shell_layers.value > 0 && region.bottom_shell_layers.value > 0 && region.wall_loops.value > 0);
    // Orca hack: Hide filament group for non-bbl printers
    if (!print.is_BBL_printer()) m_nozzle_nums = 1;
    std::vector<int>         filament_maps = print.get_filament_maps();
@@ -1661,6 +1667,7 @@ void GCodeViewer::reset_shell()
 {
    m_shells.volumes.clear();
    m_shells.print_id = -1;
+    m_shells.with_wipe_tower = false;
    m_shell_bounding_box = BoundingBoxf3();
 }

@@ -1697,6 +1704,11 @@ void GCodeViewer::reset()
 void GCodeViewer::render_scene(int canvas_width, int canvas_height)
 {
    glsafe(::glEnable(GL_DEPTH_TEST));
+    // while dragging in the solid model mode, the objects stand in for their toolpaths, cut to the
+    // visible layer range; the toolpath set then holds only the range's bottom and top layers
+    if (m_viewer.is_reduced_detail() && solid_model_enabled())
+        render_solid_model(canvas_width, canvas_height);
+    else
        render_shells(canvas_width, canvas_height);

    if (m_viewer.get_extrusion_roles_count() == 0)
@@ -2020,6 +2032,56 @@ void GCodeViewer::update_layers_slider_mode()
    // TODO m_layers_slider->SetModeAndOnlyExtruder(one_extruder_printed_model, only_extruder);
 }

+void GCodeViewer::set_interacting(bool interacting)
+{
+    // with no shells to stand in for the toolpaths, the solid model would leave only the end layers
+    const bool usable = !solid_model_enabled() || !m_shells.volumes.empty();
+    m_viewer.set_reduced_detail(interacting && usable);
+}
+
+void GCodeViewer::read_reduced_detail_preferences()
+{
+    m_reduced_detail_mode = reduced_detail_mode_from_string(get_app_config()->get("preview_reduced_detail_mode"));
+    apply_reduced_detail_settings();
+}
+
+void GCodeViewer::apply_reduced_detail_settings()
+{
+    m_viewer.set_reduced_detail_mode(m_reduced_detail_mode);
+}
+
+void GCodeViewer::set_reduced_detail_mode(const std::string& mode)
+{
+    const bool was_solid = solid_model_enabled();
+    m_reduced_detail_mode = reduced_detail_mode_from_string(mode);
+    apply_reduced_detail_settings();
+    reload_shells_if_solid_model_changed(was_solid);
+}
+
+libvgcode::EReducedDetailMode GCodeViewer::reduced_detail_mode_from_string(const std::string& mode)
+{
+    if (mode == "solid")
+        return libvgcode::EReducedDetailMode::EndLayersOnly;
+    if (mode == "shell")
+        return libvgcode::EReducedDetailMode::ShellOnly;
+    return libvgcode::EReducedDetailMode::Off;
+}
+
+void GCodeViewer::reload_shells_if_solid_model_changed(bool was_enabled)
+{
+    if (was_enabled == solid_model_enabled() || m_shells.print_id == -1)
+        return;
+    // only the prime tower comes and goes with the mode: a full reload would drop the shells
+    // whenever the print has moved on since they were loaded, leaving the solid model nothing to draw
+    if (wxGetApp().plater() == nullptr)
+        return;
+    // the shells are loaded from the current plate's print, which is not the plater's own
+    const Print& print = wxGetApp().plater()->get_partplate_list().get_current_fff_print();
+    if (static_cast<int>(print.id().id) != m_shells.print_id)
+        return;
+    update_shell_wipe_tower(print, m_gl_data_initialized);
+}
+
 void GCodeViewer::set_layers_z_range(const std::array<unsigned int, 2>& layers_z_range)
 {
    m_viewer.set_layers_view_range(static_cast<uint32_t>(layers_z_range[0]), static_cast<uint32_t>(layers_z_range[1]));
@@ -2344,7 +2406,11 @@ void GCodeViewer::export_toolpaths_to_obj(const char* filename) const
 void GCodeViewer::load_shells(const Print& print, bool initialized, bool force_previewing)
 {
    BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << boost::format(": initialized=%1%, force_previewing=%2%")%initialized %force_previewing;
+    // the shells can load before the first G-code does, so the preferences are read here as well
+    read_reduced_detail_preferences();
    if ((print.id().id == m_shells.print_id)&&(print.get_modified_count() == m_shells.print_modify_count)) {
+        // the prime tower comes and goes on its own, without reloading the objects
+        update_shell_wipe_tower(print, initialized);
        //BBS: update force previewing logic
        if (force_previewing)
            m_shells.previewing = force_previewing;
@@ -2453,10 +2519,45 @@ void GCodeViewer::load_shells(const Print& print, bool initialized, bool force_p
    m_shells.print_id = print.id().id;
    m_shells.print_modify_count = print.get_modified_count();
    m_shells.previewing = true;
+    update_shell_wipe_tower(print, initialized);
    BOOST_LOG_TRIVIAL(debug) << __FUNCTION__ << boost::format(": shell loaded, id change to %1%, modify_count %2%, object count %3%, glvolume count %4%")
        % m_shells.print_id % m_shells.print_modify_count % object_count %m_shells.volumes.volumes.size();
 }

+// The prime tower as it was sliced, so that the solid model shows what the print shows. It keeps its
+// opaque colour, so it never appears among the translucent shells, and stays out of their bounding box.
+void GCodeViewer::update_shell_wipe_tower(const Print& print, bool initialized)
+{
+    const bool with_wipe_tower = solid_model_enabled() && print.is_step_done(psWipeTower) && print.wipe_tower_data().wipe_tower_mesh_data;
+    if (with_wipe_tower == m_shells.with_wipe_tower)
+        return;
+    m_shells.with_wipe_tower = with_wipe_tower;
+    GLVolumePtrs& volumes = m_shells.volumes.volumes;
+    if (!with_wipe_tower) {
+        volumes.erase(std::remove_if(volumes.begin(), volumes.end(), [](GLVolume* volume) {
+            if (!volume->is_wipe_tower)
+                return false;
+            delete volume;
+            return true;
+        }), volumes.end());
+        return;
+    }
+    const PrintConfig& config = print.config();
+    const int plate_idx = print.get_plate_index();
+    const Vec3d plate_origin = print.get_plate_origin();
+    const float x = static_cast<float>(config.wipe_tower_x.get_at(plate_idx) + plate_origin.x());
+    const float y = static_cast<float>(config.wipe_tower_y.get_at(plate_idx) + plate_origin.y());
+    const size_t first_new = volumes.size();
+    m_shells.volumes.load_real_wipe_tower_preview(1000 + plate_idx, x, y, print.wipe_tower_data().wipe_tower_mesh_data->real_wipe_tower_mesh,
+                                                  print.wipe_tower_data().wipe_tower_mesh_data->real_brim_mesh, true,
+                                                  static_cast<float>(config.wipe_tower_rotation_angle), false, initialized);
+    for (size_t i = first_new; i < volumes.size(); ++i) {
+        volumes[i]->zoom_to_volumes = false;
+        volumes[i]->force_native_color = true;
+        volumes[i]->set_render_color();
+    }
+}
+
 void GCodeViewer::render_toolpaths()
 {
    const Camera& camera = wxGetApp().plater()->get_camera();
@@ -2657,6 +2758,50 @@ void GCodeViewer::render_shells(int canvas_width, int canvas_height)
    glsafe(::glDepthMask(GL_TRUE));
 }

+// The sliced objects and the prime tower drawn opaque, in their filament colours, cut to the
+// visible layer range by the shader's z range. The toolpaths of the range's bottom and top layers
+// are drawn afterwards and cap the cut.
+void GCodeViewer::render_solid_model(int canvas_width, int canvas_height)
+{
+    if (m_shells.volumes.empty())
+        return;
+    // gouraud_light has no z range, so it could not cut the model
+    GLShaderProgram* shader = wxGetApp().get_shader("gouraud");
+    if (shader == nullptr)
+        return;
+
+    const libvgcode::Interval& layers = m_viewer.get_layers_view_range();
+    const float z_top = m_viewer.get_layer_z(layers[1]) - m_z_offset + 0.001f;
+    const float z_bottom = (layers[0] > 0) ? m_viewer.get_layer_z(layers[0] - 1) - m_z_offset - 0.001f : -FLT_MAX;
+
+    std::vector<float> alphas;
+    alphas.reserve(m_shells.volumes.volumes.size());
+    for (GLVolume* volume : m_shells.volumes.volumes) {
+        alphas.push_back(volume->color.a());
+        volume->color.a(1.0f);
+        volume->set_render_color();
+    }
+    m_shells.volumes.set_z_range(z_bottom, z_top);
+    // gouraud also clips by this plane, which nothing else sets on the shells
+    m_shells.volumes.set_clipping_plane(ClippingPlane::ClipsNothing().get_data());
+
+    shader->start_using();
+    // the 3D view leaves its shadow settings on the shared program
+    shader->set_uniform("shadow_intensity", 0.0f);
+    const Camera& camera = wxGetApp().plater()->get_camera();
+    shader->set_uniform("z_far", camera.get_far_z());
+    shader->set_uniform("z_near", camera.get_near_z());
+    m_shells.volumes.render(GLVolumeCollection::ERenderType::Opaque, false, camera.get_view_matrix(), camera.get_projection_matrix(), {canvas_width, canvas_height});
+    shader->stop_using();
+
+    m_shells.volumes.set_z_range(-FLT_MAX, FLT_MAX);
+    size_t k = 0;
+    for (GLVolume* volume : m_shells.volumes.volumes) {
+        volume->color.a(alphas[k++]);
+        volume->set_render_color();
+    }
+}
+
 //BBS
 void GCodeViewer::render_all_plates_stats(const std::vector<const GCodeProcessorResult*>& gcode_result_list, bool show /*= true*/) const {
    if (!show)
@@ -174,6 +174,8 @@ public:
        int  print_id{-1};
        int  print_modify_count{-1};
        bool previewing{false};
+        // the prime tower was loaded with the objects, for the solid model
+        bool with_wipe_tower{false};
    };
    //BBS
    ConflictResultOpt m_conflict_result;
@@ -234,6 +236,17 @@ private:

    bool m_legend_visible{ true };
    bool m_legend_enabled{ true };
+    // the reduced-detail preferences, pushed to libvgcode by apply_reduced_detail_settings()
+    libvgcode::EReducedDetailMode m_reduced_detail_mode{ libvgcode::EReducedDetailMode::Off };
+    void read_reduced_detail_preferences();
+    void apply_reduced_detail_settings();
+    static libvgcode::EReducedDetailMode reduced_detail_mode_from_string(const std::string& mode);
+    // in the solid model mode, the sliced objects are drawn as solid shapes instead of toolpaths
+    bool solid_model_enabled() const { return m_reduced_detail_mode == libvgcode::EReducedDetailMode::EndLayersOnly; }
+    void render_solid_model(int canvas_width, int canvas_height);
+    // the prime tower is only among the shells for the solid model, so it is added or removed when that changes
+    void reload_shells_if_solid_model_changed(bool was_enabled);
+    void update_shell_wipe_tower(const Print& print, bool initialized);

    float m_legend_height;
    PrintEstimatedStatistics m_print_statistics;
@@ -291,7 +304,7 @@ public:
    // void _render_calibration_thumbnail_internal(ThumbnailData& thumbnail_data, const ThumbnailsParams& thumbnail_params, PartPlateList& partplate_list, OpenGLManager& opengl_manager);
    // void _render_calibration_thumbnail_framebuffer(ThumbnailData& thumbnail_data, unsigned int w, unsigned int h, const ThumbnailsParams& thumbnail_params, PartPlateList& partplate_list, OpenGLManager& opengl_manager);
    // void render_calibration_thumbnail(ThumbnailData& thumbnail_data, unsigned int w, unsigned int h, const ThumbnailsParams& thumbnail_params, PartPlateList& partplate_list, OpenGLManager& opengl_manager);
-    bool has_data() const { return !m_viewer.get_extrusion_roles().empty(); }
+    bool has_data() const { return m_viewer.get_extrusion_roles_count() != 0; }

    bool can_export_toolpaths() const;
    std::vector<int> get_plater_extruder();
@@ -363,6 +376,14 @@ public:
    void set_dim_previous_layers_brightness(float value) { m_viewer.set_dim_previous_layers_brightness(value); }
    float get_dim_previous_layers_brightness() const { return m_viewer.get_dim_previous_layers_brightness(); }

+    // whether the mouse is holding either slider's handle
+    bool is_slider_dragging() const { return m_layers_slider->is_dragging() || m_moves_slider->is_dragging(); }
+    // while the user drags the camera or a slider, draw the reduced set, if the preference asks for one
+    void set_interacting(bool interacting);
+    bool is_reduced_detail() const { return m_viewer.is_reduced_detail(); }
+    // the preference's string value: "off", "solid" or "shell"
+    void set_reduced_detail_mode(const std::string& mode);
+
    void set_layers_z_range(const std::array<unsigned int, 2>& layers_z_range);

    bool is_legend_shown() const { return m_legend_visible && m_legend_enabled; }
@@ -2084,6 +2084,11 @@ void GLCanvas3D::_render_frame(bool scene_dirty, bool only_init)
    const bool overlay_tick = m_fps_overlay_tick;
    m_fps_overlay_tick = false;

+    // Whether the preview draws its reduced set is decided before the cached scene is consulted,
+    // since switching changes what the scene pass draws.
+    if (m_canvas_type == ECanvasType::CanvasPreview && m_render_preview && m_gcode_viewer.has_data() && _update_preview_interaction())
+        scene_dirty = true;
+
    // An overlay-only frame reuses the last scene pass. The overlay is rebuilt either way, and drawn
    // below once it is known whether the frame differs from the one on screen.
    const bool reuse_scene = !scene_dirty && _can_reuse_cached_scene(camera);
@@ -3277,9 +3282,16 @@ void GLCanvas3D::bind_event_handlers()
                if (m_selection_edit.kind != SelectionEdit::None)
                    finish_selection_edit();
                ImGui::SetWindowFocus(nullptr);
+                // a drag cut short never sees its button release, which would leave the reduced set drawn
+                if (m_canvas_type == CanvasPreview && m_mouse.dragging && m_gcode_viewer.is_reduced_detail())
+                    mouse_up_cleanup();
                render();
                evt.Skip();
            });
+        m_canvas->Bind(wxEVT_MOUSE_CAPTURE_LOST, [this](wxMouseCaptureLostEvent&) {
+                if (m_canvas_type == CanvasPreview && m_mouse.dragging && m_gcode_viewer.is_reduced_detail())
+                    mouse_up_cleanup();
+            });
        m_event_handlers_bound = true;

        m_canvas->Bind(wxEVT_GESTURE_PAN, &GLCanvas3D::on_gesture, this);
@@ -3355,6 +3367,17 @@ void GLCanvas3D::on_idle(wxIdleEvent& evt)
    m_overlay_dirty |= imgui_requires_extra_frame;
 #endif // ENABLE_ENHANCED_IMGUI_SLIDER_FLOAT
    m_dirty |= GLTexture::Compressor::has_compressed_texture_to_refresh();
+    // the render timer only wakes the idle loop; the frame that puts the preview's toolpaths back
+    // after a wheel burst has to be asked for here, once the settle time is really up
+    if (m_preview_settle_pending) {
+        const auto now = std::chrono::steady_clock::now();
+        if (now >= m_preview_interaction_until) {
+            m_preview_settle_pending = false;
+            m_dirty = true;
+        }
+        else // the timer fired early
+            schedule_extra_frame(static_cast<int>(std::chrono::duration_cast<std::chrono::milliseconds>(m_preview_interaction_until - now).count()) + 1);
+    }

    if (!m_dirty && !m_overlay_dirty)
        return;
@@ -3885,6 +3908,10 @@ void GLCanvas3D::on_mouse_wheel(wxMouseEvent& evt)
        return;
    }

+    // only a wheel the panels did not take moves the camera
+    if (m_canvas_type == CanvasPreview)
+        note_preview_interaction();
+
 #ifdef __WXMSW__
 	// For some reason the Idle event is not being generated after the mouse scroll event in case of scrolling with the two fingers on the touch pad,
 	// if the event is not allowed to be passed further.
@@ -3985,6 +4012,11 @@ void GLCanvas3D::on_fps_overlay_timer(wxTimerEvent& evt)
    wxWakeUpIdle();
 }

+void GLCanvas3D::note_preview_interaction()
+{
+    m_preview_interaction_until = std::chrono::steady_clock::now() + std::chrono::milliseconds(150);
+}
+
 void GLCanvas3D::schedule_extra_frame(int milliseconds)
 {
    // Schedule idle event right now
@@ -5631,6 +5663,9 @@ void GLCanvas3D::mouse_up_cleanup()
    m_mouse.ignore_left_up = false;
    m_mouse.ignore_right_up = false;
    m_dirty = true;
+    // the frame that follows a release puts the preview's toolpaths back, and on some platforms
+    // no idle event follows a button release until the next input
+    wxWakeUpIdle();

    if (m_canvas->HasCapture())
        m_canvas->ReleaseMouse();
@@ -6546,11 +6581,8 @@ void GLCanvas3D::render_thumbnail_internal(ThumbnailData& thumbnail_data, const
    //    glsafe(::glClearColor(1.0f, 1.0f, 1.0f, 1.0f));
    BOOST_LOG_TRIVIAL(info) << boost::format("render_thumbnail: finished");

-    // Puts the canvas viewport back in place of the thumbnail one set above. The CLI renders
-    // thumbnails with no application and no plater, so there is no canvas viewport to restore.
-    if (wxTheApp != nullptr)
-        if (Plater *plater = wxGetApp().plater(); plater != nullptr)
-            plater->get_camera().apply_viewport();
+    // Puts the canvas viewport back in place of the thumbnail one set above.
+    wxGetApp().plater()->get_camera().apply_viewport();
 }

 void GLCanvas3D::render_thumbnail_framebuffer(ThumbnailData& thumbnail_data, unsigned int w, unsigned int h, const ThumbnailsParams& thumbnail_params,
@@ -7782,13 +7814,20 @@ bool GLCanvas3D::_is_scene_cacheable() const
        return false;
 #endif

-    // The scene follows the cursor during a drag, under a gizmo that draws at the cursor, and while
-    // the cursor is on the layer height bar, where the object shader draws a band at its height.
+    // The scene follows the cursor while the user drags, under a gizmo that draws at the cursor, and
+    // while the cursor is on the layer height bar, where the object shader draws a band at its height.
    const GLGizmoBase* gizmo = m_gizmos.get_current();
    const bool cursor_on_layers_bar = is_layers_editing_enabled() &&
        m_layers_editing.bar_rect_contains(*this, (float)m_mouse.position.x(), (float)m_mouse.position.y());
-    return !m_mouse.dragging && !m_gizmos.is_dragging() && !m_rectangle_selection.is_dragging() &&
-           (gizmo == nullptr || !gizmo->render_follows_cursor()) && !cursor_on_layers_bar;
+    return !is_user_interacting() && (gizmo == nullptr || !gizmo->render_follows_cursor()) && !cursor_on_layers_bar;
+}
+
+// Whether the user is holding something that moves the scene: the camera, the navigator, a gizmo,
+// the rectangle selection or a preview slider.
+bool GLCanvas3D::is_user_interacting() const
+{
+    return m_mouse.dragging || m_navigator_dragging || m_gizmos.is_dragging() || m_rectangle_selection.is_dragging() ||
+           m_gcode_viewer.is_slider_dragging();
 }

 bool GLCanvas3D::_is_frame_skipping_enabled() const
@@ -8779,6 +8818,24 @@ void GLCanvas3D::_render_wireframe_overlay()
    shader->stop_using();
 }

+// The reduced set is drawn while the camera, the navigator or either slider is dragged. A wheel
+// step has no duration, so it holds the reduced set for a settle time instead, and the frame that
+// restores the full toolpaths is scheduled for when that time runs out. Returns whether what the scene
+// pass draws changed, since a frame that reuses the cached scene would hide the change.
+bool GLCanvas3D::_update_preview_interaction()
+{
+    const auto now = std::chrono::steady_clock::now();
+    const bool settling = now < m_preview_interaction_until;
+    const bool dragging = is_user_interacting();
+    const bool was_reduced = m_gcode_viewer.is_reduced_detail();
+    m_gcode_viewer.set_interacting(dragging || settling);
+    if (settling && !dragging && m_gcode_viewer.is_reduced_detail()) {
+        m_preview_settle_pending = true;
+        schedule_extra_frame(static_cast<int>(std::chrono::duration_cast<std::chrono::milliseconds>(m_preview_interaction_until - now).count()) + 1);
+    }
+    return m_gcode_viewer.is_reduced_detail() != was_reduced;
+}
+
 //BBS: GUI refactor: add canvas size as parameters
 void GLCanvas3D::_render_gcode(int canvas_width, int canvas_height)
 {
@@ -656,6 +656,10 @@ private:
    ECursorType m_cursor_type;
    GLSelectionRectangle m_rectangle_selection;
    bool m_navigator_dragging{ false };
+    // until when a wheel step keeps the preview's reduced set drawn
+    std::chrono::time_point<std::chrono::steady_clock> m_preview_interaction_until{};
+    // whether the frame that restores the toolpaths once that time is up is still owed
+    bool m_preview_settle_pending{ false };

    //BBS:add plate related logic
    mutable std::vector<int> m_hover_volume_idxs;
@@ -1222,6 +1226,10 @@ public:
    void msw_rescale() { m_gcode_viewer.invalidate_legend(); }

    void request_extra_frame() { m_extra_frame_requested = true; }
+    // whether the user is holding the camera, the navigator, a gizmo, the rectangle selection or a preview slider
+    bool is_user_interacting() const;
+    // a wheel step is over before the next frame, so it holds the preview's reduced set for a settle time
+    void note_preview_interaction();

    void schedule_extra_frame(int milliseconds);

@@ -1372,6 +1380,9 @@ private:
    //BBS: GUI refactor: add canvas size as parameters
    void _render_gcode(int canvas_width, int canvas_height);
    void _render_gcode_overlay(int canvas_width, int canvas_height);
+    // decides whether the preview draws its reduced set this frame and returns whether what the scene
+    // pass draws changed; runs before the cached scene is consulted
+    bool _update_preview_interaction();
    //BBS: render a plane for assemble
    void _render_plane() const;
    void _render_selection();
@@ -14,9 +14,6 @@
 #include <boost/algorithm/string/predicate.hpp>
 #include <boost/any.hpp>

-#include <wx/filename.h>
-#include <wx/filesys.h>
-
 #if __APPLE__
 #import <IOKit/pwr_mgt/IOPMLib.h>
 #elif _WIN32
@@ -30,13 +27,11 @@

 #include "AboutDialog.hpp"
 #include "MsgDialog.hpp"
-#include "Plater.hpp"
 #include "format.hpp"

 #include "WebUserLoginDialog.hpp"

 #include "libslic3r/Print.hpp"
-#include "libslic3r/Utils.hpp"

 namespace Slic3r {

@@ -536,11 +531,6 @@ boost::filesystem::path into_path(const wxString &str)
 	return boost::filesystem::path(str.wx_str());
 }

-wxString file_url_from_path(const boost::filesystem::path &path)
-{
-	return wxFileSystem::FileNameToURL(wxFileName(from_path(path)));
-}
-
 void about()
 {
    AboutDialog dlg;
@@ -645,26 +635,4 @@ void desktop_open_any_folder( const std::string& path )
 }


-bool desktop_open_project_attachment(wxWindow *parent, const boost::filesystem::path &path)
-{
-    // The auxiliary path is UTF-8, which is what boost::filesystem reads a narrow string as.
-    const boost::filesystem::path aux_root(wxGetApp().plater()->model().get_auxiliary_file_temp_path());
-    boost::system::error_code ec;
-    if (!is_absolute_path_within_root(path, aux_root) || !boost::filesystem::is_regular_file(path, ec))
-        return false;
-
-    // Attachments come with the project and carry no download mark, so the desktop would open them without a warning.
-    if (!is_safe_to_open_file_name(path.filename().string())) {
-        MessageDialog dlg(parent,
-                          wxString::Format(_L("\"%s\" is not a plain document, image or model file. Opening it may run it as a "
-                                              "program or script on this computer.\n\n"
-                                              "Only open attachments from projects you trust. Open it anyway?"),
-                                           from_path(path.filename())),
-                          _L("Open attachment"), wxICON_WARNING | wxYES_NO);
-        if (dlg.ShowModal() != wxID_YES)
-            return false;
-    }
-    return wxLaunchDefaultApplication(from_path(path), 0);
-}
-
 } }
@@ -76,9 +76,6 @@ std::string	into_u8(const wxString &str);
 wxString	from_path(const boost::filesystem::path &path);
 // boost path from wxString
 boost::filesystem::path	into_path(const wxString &str);
-// file:// URL of a local path, percent-encoded so characters such as '#', '%' and '?' stay part of the path.
-// Append any query or fragment to the result.
-wxString	file_url_from_path(const boost::filesystem::path &path);

 // Display an About dialog
 extern void about();
@@ -86,9 +83,6 @@ extern void about();
 extern void desktop_open_datadir_folder();
 // Ask the destop to open one folder
 extern void desktop_open_any_folder(const std::string& path);
-// Ask the desktop to open a file from the project's auxiliary directory, after a confirmation
-// unless its type is known to be plain content. Returns false if the file was not opened.
-extern bool desktop_open_project_attachment(wxWindow *parent, const boost::filesystem::path &path);
 } // namespace GUI
 } // namespace Slic3r

@@ -1512,33 +1512,11 @@ int GUI_App::install_plugin(std::string name, std::string package_name, InstallP
                    size_t n = mz_zip_reader_get_extra(&archive, stat.m_file_index, extra.data(), extra.size());
                    dest_file = decode(extra.substr(0, n), stat.m_filename);
                }
-                if (!is_path_within_root(dest_file, plugin_folder)) {
-                    BOOST_LOG_TRIVIAL(error) << "[install_plugin] entry " << dest_file << " resolves outside " << plugin_folder.string();
-                    close_zip_reader(&archive);
-                    if (pro_fn) { pro_fn(InstallStatusUnzipFailed, 0, cancel); }
-                    return InstallStatusUnzipFailed;
-                }
                auto dest_path = plugin_folder / dest_file;
-                std::string dest_zip_file = encode_path(dest_path.string().c_str());
-#ifndef WIN32
-                // Validate a symlink's target before anything at the destination is replaced.
-                const bool is_link = S_ISLNK(stat.m_external_attr >> 16);
-                std::string link;
-                if (is_link) {
-                    link.assign(stat.m_uncomp_size, 0);
-                    if (!mz_zip_reader_extract_to_mem(&archive, stat.m_file_index, link.data(), stat.m_uncomp_size, 0) ||
-                        !is_symlink_target_within_root(dest_file, link, plugin_folder)) {
-                        BOOST_LOG_TRIVIAL(error) << "[install_plugin] link " << dest_file << " -> " << link << " is unreadable or resolves outside " << plugin_folder.string();
-                        close_zip_reader(&archive);
-                        if (pro_fn) { pro_fn(InstallStatusUnzipFailed, 0, cancel); }
-                        return InstallStatusUnzipFailed;
-                    }
-                }
-#endif
-                try {
                boost::filesystem::create_directories(dest_path.parent_path());
-                    // symlink_status so that an existing symlink, dangling or not, is replaced rather than written through.
-                    if (fs::exists(fs::symlink_status(dest_path))) {
+                std::string dest_zip_file = encode_path(dest_path.string().c_str());
+                try {
+                    if (fs::exists(dest_path)) {
                        boost::system::error_code ec;
                        fs::remove(dest_path, ec);
                        if (ec) {
@@ -1566,8 +1544,9 @@ int GUI_App::install_plugin(std::string name, std::string package_name, InstallP
                    }
                    mz_bool res = 0;
 #ifndef WIN32
-                    if (is_link) {
-                        res = 1;
+                    if (S_ISLNK(stat.m_external_attr >> 16)) {
+                        std::string link(stat.m_uncomp_size + 1, 0);
+                        res = mz_zip_reader_extract_to_mem(&archive, stat.m_file_index, link.data(), stat.m_uncomp_size, 0);
                        try {
                            boost::filesystem::create_symlink(link, dest_path);
                        } catch (const std::exception &e) {
@@ -483,6 +483,11 @@ void IMSlider::draw_background_and_groove(const ImRect& bg_rect, const ImRect& g
    ImGui::RenderFrame(groove.Min, groove.Max, groove_col, false, 0.5 * groove.GetWidth());
 }

+bool IMSlider::is_dragging() const
+{
+    return GImGui != nullptr && m_imgui_id != 0 && GImGui->ActiveId == m_imgui_id && GImGui->IO.MouseDown[0];
+}
+
 bool IMSlider::horizontal_slider(const char* str_id, int* value, int v_min, int v_max, const ImVec2& size, float scale)
 {
    ImGuiWindow* window = ImGui::GetCurrentWindow();
@@ -491,6 +496,7 @@ bool IMSlider::horizontal_slider(const char* str_id, int* value, int v_min, int

    ImGuiContext& context = *GImGui;
    const ImGuiID id = window->GetID(str_id);
+    m_imgui_id = id;

    const ImVec2 pos = window->DC.CursorPos;
    const ImRect draw_region(pos, pos + size);
@@ -883,6 +889,7 @@ bool IMSlider::vertical_slider(const char* str_id, int* higher_value, int* lower

    ImGuiContext& context = *GImGui;
    const ImGuiID id = window->GetID(str_id);
+    m_imgui_id = id;

    const ImVec2 pos = window->DC.CursorPos;
    const ImRect draw_region(pos, pos + size);
@@ -118,6 +118,9 @@ public:

    //BBS update scroll value changed
    bool is_dirty() { return m_dirty; }
+    // whether the mouse is holding this slider's handle, read from ImGui's active id rather than
+    // from the dirty flag, which is raised and consumed inside a single frame
+    bool is_dragging() const;
    void set_as_dirty(bool dirty = true) { m_dirty = dirty; }
    bool is_need_post_tick_event() { return m_is_need_post_tick_changed_event; }
    void reset_post_tick_event(bool val = false) {
@@ -182,6 +185,8 @@ private:
    int  m_higher_value;
    int  m_one_layer_value; // ORCA
    bool m_dirty = false;
+    // the ImGui id of the slider widget, as of its last render
+    unsigned int m_imgui_id = 0;

    bool m_render_as_disabled{ false };

@@ -1997,126 +1997,6 @@ bool MainFrame::can_reslice() const
    return (m_plater != nullptr) && !m_plater->model().objects.empty();
 }

-namespace {
-// Orca: stable key persisted by the "remember last print action" preference. Reordering PrintSelectType
-// must not silently remap a saved preference, so the key never derives from the enum value.
-const char* print_select_type_key(MainFrame::PrintSelectType type)
-{
-    switch (type) {
-    case MainFrame::ePrintAll:            return "print_all";
-    case MainFrame::ePrintPlate:          return "print_plate";
-    case MainFrame::eExportSlicedFile:    return "export_sliced_file";
-    case MainFrame::eExportAllSlicedFile: return "export_all_sliced_file";
-    case MainFrame::eExportGcode:         return "export_gcode";
-    case MainFrame::eSendGcode:           return "send_gcode";
-    case MainFrame::eSendToPrinter:       return "send_to_printer";
-    case MainFrame::eSendToPrinterAll:    return "send_to_printer_all";
-    case MainFrame::ePrintMultiMachine:   return "print_multi_machine";
-    case MainFrame::eUploadGcode:         break; // Orca: no dropdown entry, never selectable
-    }
-    return "";
-}
-
-// Orca: single source for the print button and print dropdown labels
-wxString print_select_type_label(MainFrame::PrintSelectType type)
-{
-    switch (type) {
-    case MainFrame::ePrintAll:            return _L("Print all");
-    case MainFrame::ePrintPlate:          return _L("Print plate");
-    case MainFrame::eExportSlicedFile:    return _L("Export plate sliced file");
-    case MainFrame::eExportAllSlicedFile: return _L("Export all sliced file");
-    case MainFrame::eExportGcode:         return _L("Export G-code file");
-    case MainFrame::eSendGcode:           return _L_CONTEXT("Print", "Verb");
-    case MainFrame::eSendToPrinter:       return _L("Send");
-    case MainFrame::eSendToPrinterAll:    return _L("Send all");
-    case MainFrame::ePrintMultiMachine:   return _L("Send to Multi-device");
-    case MainFrame::eUploadGcode:         break; // Orca: no dropdown entry, never selectable
-    }
-    return _L("Print plate");
-}
-} // namespace
-
-std::vector<MainFrame::PrintSelectType> MainFrame::available_print_actions() const
-{
-    std::vector<PrintSelectType> actions;
-    const auto preset_bundle      = wxGetApp().preset_bundle;
-    const bool use_printer_agents = wxGetApp().app_config->get_bool("use_printer_agents");
-
-    if (preset_bundle && !preset_bundle->is_bbl_vendor() && !use_printer_agents) {
-        // ThirdParty actions
-        actions.push_back(eSendGcode);
-        // Orca: when the printer accepts a .gcode.3mf (the "Support 3MF as gcode" option),
-        // also offer exporting the sliced .gcode.3mf bundle
-        const auto* use_3mf_opt = preset_bundle->printers.get_edited_preset().config.option<ConfigOptionBool>("use_3mf");
-        if (use_3mf_opt != nullptr && use_3mf_opt->value)
-            actions.push_back(eExportSlicedFile);
-        actions.push_back(eExportGcode);
-        return actions;
-    }
-
-    // Orca Slicer actions
-    bool support_send      = true;
-    bool support_print_all = true;
-    if (preset_bundle && !preset_bundle->use_bbl_network() && !use_printer_agents) {
-        support_send = false; // All 3rd print hosts do not have the send options
-
-        const auto& cfg           = preset_bundle->printers.get_edited_preset().config;
-        const auto* host_type_opt = cfg.option<ConfigOptionEnum<PrintHostType>>("host_type");
-        // Only simply print support uploading all plates
-        support_print_all = host_type_opt != nullptr && host_type_opt->value == PrintHostType::htSimplyPrint;
-    }
-
-    actions.push_back(ePrintPlate);
-    if (support_print_all)
-        actions.push_back(ePrintAll);
-    if (support_send) {
-        actions.push_back(eSendToPrinter);
-        actions.push_back(eSendToPrinterAll);
-    }
-    if (enable_multi_machine)
-        actions.push_back(ePrintMultiMachine);
-    actions.push_back(eExportSlicedFile);
-    actions.push_back(eExportAllSlicedFile);
-    actions.push_back(eExportGcode);
-    return actions;
-}
-
-void MainFrame::select_print_action(PrintSelectType select_type)
-{
-    m_print_btn->SetLabel(print_select_type_label(select_type));
-    m_print_select = select_type;
-    remember_print_select(select_type);
-    m_print_enable = get_enable_print_status();
-    m_print_btn->Enable(m_print_enable);
-    this->Layout();
-    fit_tab_labels(); // ORCA on label change
-}
-
-void MainFrame::remember_print_select(PrintSelectType select_type)
-{
-    if (!wxGetApp().app_config->get_bool("remember_print_action"))
-        return;
-    // AppConfig is marked dirty here and flushed by the regular autosave
-    wxGetApp().app_config->set("last_print_action", print_select_type_key(select_type));
-}
-
-bool MainFrame::get_remembered_print_select(PrintSelectType& out) const
-{
-    if (!wxGetApp().app_config->get_bool("remember_print_action"))
-        return false;
-    const std::string saved = wxGetApp().app_config->get("last_print_action");
-    if (saved.empty())
-        return false;
-    // Orca: only restore an action the current printer actually offers in the dropdown
-    for (PrintSelectType type : available_print_actions()) {
-        if (saved == print_select_type_key(type)) {
-            out = type;
-            return true;
-        }
-    }
-    return false;
-}
-
 wxBoxSizer* MainFrame::create_side_tools()
 {
    enable_multi_machine = wxGetApp().is_enable_multi_machine();
@@ -2136,14 +2016,6 @@ wxBoxSizer* MainFrame::create_side_tools()
    m_print_btn = new SideButton(print_panel, _L("Print plate"), "");
    m_print_option_btn = new SideButton(print_panel, "", "sidebutton_dropdown", 0, 14);

-    // Orca: restore the last used print/export action if the user opted to remember it
-    PrintSelectType remembered_print_select;
-    if (get_remembered_print_select(remembered_print_select)) {
-        m_print_select = remembered_print_select;
-        m_print_btn->SetLabel(print_select_type_label(remembered_print_select));
-        fit_tab_labels(); // ORCA on label change
-    }
-
    auto slice_sizer = new wxBoxSizer(wxHORIZONTAL);
    slice_sizer->Add(m_slice_option_btn, 0, wxRIGHT | wxALIGN_CENTER_VERTICAL, FromDIP(1));
    slice_sizer->Add(m_slice_btn, 0, wxLEFT | wxALIGN_CENTER_VERTICAL, FromDIP(1));
@@ -2306,15 +2178,193 @@ wxBoxSizer* MainFrame::create_side_tools()
    m_print_option_btn->Bind(wxEVT_BUTTON, [this](wxCommandEvent& event)
        {
            SidePopup* p = new SidePopup(this);
-            for (PrintSelectType type : available_print_actions()) {
-                SideButton* btn = new SideButton(p, print_select_type_label(type), "");
-                btn->SetCornerRadius(0);
-                btn->Bind(wxEVT_BUTTON, [this, p, type](wxCommandEvent&) {
-                    select_print_action(type);
+
+            if (wxGetApp().preset_bundle
+                && !wxGetApp().preset_bundle->is_bbl_vendor()
+                && !wxGetApp().app_config->get_bool("use_printer_agents")) {
+                // ThirdParty Buttons
+                SideButton* export_gcode_btn = new SideButton(p, _L("Export G-code file"), "");
+                export_gcode_btn->SetCornerRadius(0);
+                export_gcode_btn->Bind(wxEVT_BUTTON, [this, p](wxCommandEvent&) {
+                    m_print_btn->SetLabel(_L("Export G-code file"));
+                    m_print_select = eExportGcode;
+                    m_print_enable = get_enable_print_status();
+                    m_print_btn->Enable(m_print_enable);
+                    this->Layout();
+                    fit_tab_labels(); // ORCA on label change
                    p->Dismiss();
                    });
-                p->append_button(btn);
+
+                // upload and print
+                SideButton* send_gcode_btn = new SideButton(p, _L_CONTEXT("Print", "Verb"), "");
+                send_gcode_btn->SetCornerRadius(0);
+                send_gcode_btn->Bind(wxEVT_BUTTON, [this, p](wxCommandEvent&) {
+                    m_print_btn->SetLabel(_L_CONTEXT("Print", "Verb"));
+                    m_print_select = eSendGcode;
+                    m_print_enable = get_enable_print_status();
+                    m_print_btn->Enable(m_print_enable);
+                    this->Layout();
+                    fit_tab_labels(); // ORCA on label change
+                    p->Dismiss();
+                    });
+
+                p->append_button(send_gcode_btn);
+
+                // Orca: when the printer accepts a .gcode.3mf (the "Support 3MF as gcode" option),
+                // also offer exporting the sliced .gcode.3mf bundle
+                const auto& printer_config = wxGetApp().preset_bundle->printers.get_edited_preset().config;
+                const auto* use_3mf_opt    = printer_config.option<ConfigOptionBool>("use_3mf");
+                if (use_3mf_opt != nullptr && use_3mf_opt->value) {
+                    SideButton* export_sliced_file_btn = new SideButton(p, _L("Export plate sliced file"), "");
+                    export_sliced_file_btn->SetCornerRadius(0);
+                    export_sliced_file_btn->Bind(wxEVT_BUTTON, [this, p](wxCommandEvent&) {
+                        m_print_btn->SetLabel(_L("Export plate sliced file"));
+                        m_print_select = eExportSlicedFile;
+                        m_print_enable = get_enable_print_status();
+                        m_print_btn->Enable(m_print_enable);
+                        this->Layout();
+                        fit_tab_labels(); // ORCA on label change
+                        p->Dismiss();
+                        });
+                    p->append_button(export_sliced_file_btn);
                }
+
+                p->append_button(export_gcode_btn);
+            }
+            else {
+                //Orca Slicer Buttons
+                SideButton* print_plate_btn = new SideButton(p, _L("Print plate"), "");
+                print_plate_btn->SetCornerRadius(0);
+
+                SideButton* send_to_printer_btn = new SideButton(p, _L("Send"), "");
+                send_to_printer_btn->SetCornerRadius(0);
+
+                SideButton* export_sliced_file_btn = new SideButton(p, _L("Export plate sliced file"), "");
+                export_sliced_file_btn->SetCornerRadius(0);
+
+                SideButton* export_all_sliced_file_btn = new SideButton(p, _L("Export all sliced file"), "");
+                export_all_sliced_file_btn->SetCornerRadius(0);
+
+                print_plate_btn->Bind(wxEVT_BUTTON, [this, p](wxCommandEvent&) {
+                    m_print_btn->SetLabel(_L("Print plate"));
+                    m_print_select = ePrintPlate;
+                    m_print_enable = get_enable_print_status();
+                    m_print_btn->Enable(m_print_enable);
+                    this->Layout();
+                    fit_tab_labels(); // ORCA on label change
+                    p->Dismiss();
+                    });
+
+                SideButton* print_all_btn = new SideButton(p, _L("Print all"), "");
+                print_all_btn->SetCornerRadius(0);
+                print_all_btn->Bind(wxEVT_BUTTON, [this, p](wxCommandEvent&) {
+                    m_print_btn->SetLabel(_L("Print all"));
+                    m_print_select = ePrintAll;
+                    m_print_enable = get_enable_print_status();
+                    m_print_btn->Enable(m_print_enable);
+                    this->Layout();
+                    fit_tab_labels(); // ORCA on label change
+                    p->Dismiss();
+                    });
+
+                send_to_printer_btn->Bind(wxEVT_BUTTON, [this, p](wxCommandEvent&) {
+                    m_print_btn->SetLabel(_L("Send"));
+                    m_print_select = eSendToPrinter;
+                    m_print_enable = get_enable_print_status();
+                    m_print_btn->Enable(m_print_enable);
+                    this->Layout();
+                    fit_tab_labels(); // ORCA on label change
+                    p->Dismiss();
+                    });
+
+                SideButton* send_to_printer_all_btn = new SideButton(p, _L("Send all"), "");
+                send_to_printer_all_btn->SetCornerRadius(0);
+                send_to_printer_all_btn->Bind(wxEVT_BUTTON, [this, p](wxCommandEvent&) {
+                    m_print_btn->SetLabel(_L("Send all"));
+                    m_print_select = eSendToPrinterAll;
+                    m_print_enable = get_enable_print_status();
+                    m_print_btn->Enable(m_print_enable);
+                    this->Layout();
+                    fit_tab_labels(); // ORCA on label change
+                    p->Dismiss();
+                    });
+
+                export_sliced_file_btn->Bind(wxEVT_BUTTON, [this, p](wxCommandEvent&) {
+                    m_print_btn->SetLabel(_L("Export plate sliced file"));
+                    m_print_select = eExportSlicedFile;
+                    m_print_enable = get_enable_print_status();
+                    m_print_btn->Enable(m_print_enable);
+                    this->Layout();
+                    fit_tab_labels(); // ORCA on label change
+                    p->Dismiss();
+                    });
+
+                export_all_sliced_file_btn->Bind(wxEVT_BUTTON, [this, p](wxCommandEvent&) {
+                    m_print_btn->SetLabel(_L("Export all sliced file"));
+                    m_print_select = eExportAllSlicedFile;
+                    m_print_enable = get_enable_print_status();
+                    m_print_btn->Enable(m_print_enable);
+                    this->Layout();
+                    fit_tab_labels(); // ORCA on label change
+                    p->Dismiss();
+                    });
+
+                bool support_send = true;
+                bool support_print_all = true;
+
+                const auto preset_bundle = wxGetApp().preset_bundle;
+                if (preset_bundle) {
+                    if (preset_bundle->use_bbl_network() || wxGetApp().app_config->get_bool("use_printer_agents")) {
+                        // BBL network support everything
+                    } else {
+                        support_send = false; // All 3rd print hosts do not have the send options
+
+                        auto cfg = preset_bundle->printers.get_edited_preset().config;
+                        const auto host_type = cfg.option<ConfigOptionEnum<PrintHostType>>("host_type")->value;
+
+                        // Only simply print support uploading all plates
+                        support_print_all = host_type == PrintHostType::htSimplyPrint;
+                    }
+                }
+
+                p->append_button(print_plate_btn);
+                if (support_print_all) {
+                    p->append_button(print_all_btn);
+                }
+                if (support_send) {
+                    p->append_button(send_to_printer_btn);
+                    p->append_button(send_to_printer_all_btn);
+                }
+                if (enable_multi_machine) {
+                    SideButton* print_multi_machine_btn = new SideButton(p, _L("Send to Multi-device"), "");
+                    print_multi_machine_btn->SetCornerRadius(0);
+                    print_multi_machine_btn->Bind(wxEVT_BUTTON, [this, p](wxCommandEvent&) {
+                        m_print_btn->SetLabel(_L("Send to Multi-device"));
+                        m_print_select = ePrintMultiMachine;
+                        m_print_enable = get_enable_print_status();
+                        m_print_btn->Enable(m_print_enable);
+                        this->Layout();
+                        fit_tab_labels(); // ORCA on label change
+                        p->Dismiss();
+                    });
+                    p->append_button(print_multi_machine_btn);
+                }
+                p->append_button(export_sliced_file_btn);
+                p->append_button(export_all_sliced_file_btn);
+                SideButton* export_gcode_btn = new SideButton(p, _L("Export G-code file"), "");
+                export_gcode_btn->SetCornerRadius(0);
+                export_gcode_btn->Bind(wxEVT_BUTTON, [this, p](wxCommandEvent&) {
+                    m_print_btn->SetLabel(_L("Export G-code file"));
+                    m_print_select = eExportGcode;
+                    m_print_enable = get_enable_print_status();
+                    m_print_btn->Enable(m_print_enable);
+                    this->Layout();
+                    fit_tab_labels(); // ORCA on label change
+                    p->Dismiss();
+                });
+                p->append_button(export_gcode_btn);
+            }
+
            p->Popup(m_print_btn);
        }
    );
@@ -4174,22 +4224,38 @@ void MainFrame::on_config_changed(DynamicPrintConfig* config) const

 void MainFrame::set_print_button_to_default(PrintSelectType select_type)
 {
-    // Orca: keep the user's remembered print/export action instead of resetting it to the computed
-    // default. get_remembered_print_select() already rejects anything this printer does not offer.
-    PrintSelectType remembered;
-    if (get_remembered_print_select(remembered))
-        select_type = remembered;
-
-    if (select_type == eUploadGcode)
-        return; // unsupported: no dropdown entry exists for this action
-
-    m_print_btn->SetLabel(print_select_type_label(select_type));
-    m_print_select = select_type;
-    // get_enable_print_status() already applies can_send_gcode() to the actions that need it
+    if (select_type == PrintSelectType::ePrintPlate) {
+        m_print_btn->SetLabel(_L("Print plate"));
+        m_print_select = ePrintPlate;
        if (m_print_enable)
            m_print_enable = get_enable_print_status();
        m_print_btn->Enable(m_print_enable);
        this->Layout();
+    } else if (select_type == PrintSelectType::eSendGcode) {
+        m_print_btn->SetLabel(_L_CONTEXT("Print", "Verb"));
+        m_print_select = eSendGcode;
+        if (m_print_enable)
+            m_print_enable = get_enable_print_status() && can_send_gcode();
+        m_print_btn->Enable(m_print_enable);
+        this->Layout();
+    } else if (select_type == PrintSelectType::eExportGcode) {
+        m_print_btn->SetLabel(_L("Export G-code file"));
+        m_print_select = eExportGcode;
+        if (m_print_enable)
+            m_print_enable = get_enable_print_status() && can_send_gcode();
+        m_print_btn->Enable(m_print_enable);
+        this->Layout();
+    } else if (select_type == PrintSelectType::eExportSlicedFile) {
+        m_print_btn->SetLabel(_L("Export plate sliced file"));
+        m_print_select = eExportSlicedFile;
+        if (m_print_enable)
+            m_print_enable = get_enable_print_status();
+        m_print_btn->Enable(m_print_enable);
+        this->Layout();
+    } else {
+        // unsupport
+        return;
+    }
 }

 void MainFrame::add_to_recent_projects(const wxString& filename)
@@ -13,7 +13,6 @@

 #include <string>
 #include <map>
-#include <vector>

 #include "GUI_Utils.hpp"
 #include "Event.hpp"
@@ -431,14 +430,6 @@ public:
    // Propagate changed configuration from the Tab to the Plater and save changes to the AppConfig
    void        on_config_changed(DynamicPrintConfig* cfg) const ;
    void        set_print_button_to_default(PrintSelectType select_type);
-    // Orca: the print/export actions the current printer offers, in the order the dropdown lists them.
-    // The dropdown is built from this, and a remembered action is only restored if it appears here.
-    std::vector<PrintSelectType> available_print_actions() const;
-    // Orca: apply an action picked from the print dropdown to the print button
-    void        select_print_action(PrintSelectType select_type);
-    // Orca: remember the user's preferred print/export action across sessions (see "remember_print_action" preference)
-    void        remember_print_select(PrintSelectType select_type);
-    bool        get_remembered_print_select(PrintSelectType& out) const;

    bool can_save() const;
    bool can_save_as() const;
@@ -98,7 +98,10 @@ void MarkdownTip::LoadStyle()
        ph /= "tooltip/styled.html";
        _data_dir = false;
    }
-    _tipView->LoadURL(file_url_from_path(ph));
+    auto url = ph.string();
+    std::replace(url.begin(), url.end(), '\\', '/');
+    url = "file:///" + url;
+    _tipView->LoadURL(from_u8(url));
    _lastTip.clear();
 }

@@ -286,30 +286,6 @@ static void set_config_values(DynamicPrintConfig *config, const std::string &key
    }
 }

-// Orca: a calibration print sets pressure advance explicitly to 0 on each extruder variant that
-// has it disabled, so the value stored in the printer does not skew the result. Variants with
-// pressure advance enabled keep their own value.
-static void zero_pressure_advance_where_disabled(DynamicPrintConfig *filament_config)
-{
-    auto enable_pa   = filament_config->option<ConfigOptionBools>("enable_pressure_advance");
-    auto pa          = filament_config->option<ConfigOptionFloats>("pressure_advance");
-    auto adaptive_pa = filament_config->option<ConfigOptionBools>("adaptive_pressure_advance");
-    if (!enable_pa || !pa || !adaptive_pa || pa->empty() || adaptive_pa->empty())
-        return;
-    // All variant keys share the variant count; widen a short one rather than index past it.
-    if (pa->size() < enable_pa->size())
-        pa->resize(enable_pa->size());
-    if (adaptive_pa->size() < enable_pa->size())
-        adaptive_pa->resize(enable_pa->size());
-    for (size_t variant = 0; variant < enable_pa->size(); ++variant) {
-        if (enable_pa->get_at(variant))
-            continue;
-        enable_pa->values[variant]   = true;
-        pa->values[variant]          = 0.0;
-        adaptive_pa->values[variant] = false;
-    }
-}
-
 bool Plater::has_illegal_filename_characters(const wxString& wxs_name)
 {
    std::string name = into_u8(wxs_name);
@@ -3696,7 +3672,7 @@ void Sidebar::update_all_preset_comboboxes()
        wxString url = from_u8(PrintHost::get_print_host_webui(&cfg));
        wxString apikey;
        if(url.empty())
-            url = file_url_from_path(boost::filesystem::path(resources_dir()) / "web/orca/missing_connection.html");
+            url = wxString::Format("file://%s/web/orca/missing_connection.html", from_u8(resources_dir()));
        else {
            const auto host_type = cfg.option<ConfigOptionEnum<PrintHostType>>("host_type")->value;
            if (cfg.has("printhost_apikey") && (host_type != htSimplyPrint))
@@ -17088,7 +17064,11 @@ void Plater::calib_input_shaping_freq(const Calib_Params& params)
        set_config_values<double, ConfigOptionFloatsNullable>(print_config, "default_jerk", 0);
    }

-    zero_pressure_advance_where_disabled(filament_config);
+    if (!filament_config->option<ConfigOptionBools>("enable_pressure_advance")->get_at(0)) {
+        set_config_values<bool, ConfigOptionBools>(filament_config, "enable_pressure_advance", true);
+        set_config_values<double, ConfigOptionFloatsNullable>(filament_config, "pressure_advance", 0.0);
+        set_config_values<bool, ConfigOptionBools>(filament_config, "adaptive_pressure_advance", false);
+    }

    printer_config->set_key_value("resonance_avoidance", new ConfigOptionBool{false});
    printer_config->set_key_value("input_shaping_emit", new ConfigOptionBool{false});
@@ -17150,7 +17130,11 @@ void Plater::calib_input_shaping_damp(const Calib_Params& params)
        set_config_values<double, ConfigOptionFloatsNullable>(print_config, "default_jerk", 0);
    }

-    zero_pressure_advance_where_disabled(filament_config);
+    if (!filament_config->option<ConfigOptionBools>("enable_pressure_advance")->get_at(0)) {
+        set_config_values<bool, ConfigOptionBools>(filament_config, "enable_pressure_advance", true);
+        set_config_values<double, ConfigOptionFloatsNullable>(filament_config, "pressure_advance", 0.0);
+        set_config_values<bool, ConfigOptionBools>(filament_config, "adaptive_pressure_advance", false);
+    }

    printer_config->set_key_value("resonance_avoidance", new ConfigOptionBool{false});
    printer_config->set_key_value("input_shaping_emit", new ConfigOptionBool{false});
@@ -17212,7 +17196,11 @@ void Plater::Calib_Cornering(const Calib_Params& params)
        set_config_values<double, ConfigOptionFloatsNullable>(print_config, "default_jerk", 0);
    }

-    zero_pressure_advance_where_disabled(filament_config);
+    if (!filament_config->option<ConfigOptionBools>("enable_pressure_advance")->get_at(0)) {
+        set_config_values<bool, ConfigOptionBools>(filament_config, "enable_pressure_advance", true);
+        set_config_values<double, ConfigOptionFloatsNullable>(filament_config, "pressure_advance", 0.0);
+        set_config_values<bool, ConfigOptionBools>(filament_config, "adaptive_pressure_advance", false);
+    }

    printer_config->set_key_value("resonance_avoidance", new ConfigOptionBool{false});
    printer_config->set_key_value("input_shaping_emit", new ConfigOptionBool{true});
@@ -322,7 +322,7 @@ wxBoxSizer* PreferencesDialog::create_item_combobox(wxString title, wxString too
    return sizer;
 }

-wxBoxSizer *PreferencesDialog::create_item_combobox(wxString title, wxString tooltip, std::string param, std::vector<wxString> vlist, std::vector<std::string> config_name_index, const wxString wiki_url)
+wxBoxSizer *PreferencesDialog::create_item_combobox(wxString title, wxString tooltip, std::string param, std::vector<wxString> vlist, std::vector<std::string> config_name_index, std::function<void(std::string)> onchange, const wxString wiki_url)
 {
    assert(vlist.size() == config_name_index.size());
    unsigned int current_index = 0;
@@ -338,8 +338,9 @@ wxBoxSizer *PreferencesDialog::create_item_combobox(wxString title, wxString too
    auto [sizer, combobox] = create_item_combobox_base(title, tooltip, param, vlist, current_index);

    //// save config
-    combobox->GetDropDown().Bind(wxEVT_COMBOBOX, [this, param, config_name_index](wxCommandEvent& e) {
+    combobox->GetDropDown().Bind(wxEVT_COMBOBOX, [this, param, config_name_index, onchange](wxCommandEvent& e) {
        app_config->set(param, config_name_index[e.GetSelection()]);
+        if (onchange != nullptr) onchange(config_name_index[e.GetSelection()]);
        e.Skip();
    });

@@ -1831,9 +1832,6 @@ void PreferencesDialog::create_items()
    auto item_mix_print_high_low_temperature = create_item_checkbox(_L("Remove mixed temperature restriction"), _L("With this option enabled, you can print materials with a large temperature difference together."), "enable_high_low_temp_mixed_printing");
    g_sizer->Add(item_mix_print_high_low_temperature);
 
-    auto item_remember_print_action = create_item_checkbox(_L("Remember last print action"), _L("If enabled, OrcaSlicer will remember the last selected option in the print button's dropdown (e.g. Print, Export plate sliced file, Export G-code file) and use it as the default on next startup."), "remember_print_action");
-    g_sizer->Add(item_remember_print_action);
-
    //// CONTROL > Camera
    g_sizer->Add(create_item_title(_L("Camera")), 1, wxEXPAND);

@@ -2047,6 +2045,32 @@ void PreferencesDialog::create_items()
        "preview_default_view_type", PreviewViewTypeLabels, PreviewViewTypeValues);
    g_sizer->Add(item_preview_view_type);

+    auto item_reduced_detail_mode = create_item_combobox(
+        _L("Simplify preview while dragging"),
+        _L("What the sliced preview draws while you drag the camera or a preview slider, or zoom with the mouse wheel, so that large prints stay responsive. "
+           "The full toolpaths are restored as soon as you let go.\n"
+           "Off: the full toolpaths.\n"
+           "Solid model: the sliced objects and the prime tower as solid shapes in their filament colors, cut to the visible layer range, "
+           "with its bottom and top layers drawn as toolpaths. Supports are not shown, and negative volumes are not cut out.\n"
+           "Shell only: every layer without its sparse infill, internal solid infill and gap fill, which lie under the walls and skins. "
+           "Walls, top and bottom surfaces, bridges, supports and the prime tower are drawn whole, so the print looks the same from outside.\n"
+           "The bottom and top of the visible layer range are always drawn whole."),
+        "preview_reduced_detail_mode",
+        {_L("Off"), _L("Solid model"), _L("Shell only")},
+        {"off", "solid", "shell"},
+        // apply the new mode immediately to the currently loaded preview
+        [](std::string value) {
+            if (Plater* plater = wxGetApp().plater()) {
+                if (GLCanvas3D* canvas = plater->get_preview_canvas3D()) {
+                    canvas->get_gcode_viewer().set_reduced_detail_mode(value);
+                    canvas->set_as_dirty();
+                    canvas->request_extra_frame();
+                }
+            }
+        }
+    );
+    g_sizer->Add(item_reduced_detail_mode);
+
    auto item_dim_previous_layers = create_item_checkbox(
        _L("Dim lower layers"),
        _L("When scrubbing the layer slider in the sliced preview, render the layers below the current one darkened so that only the layer being viewed is shown at full brightness."),
@@ -93,7 +93,7 @@ public:
    wxBoxSizer *create_item_title(wxString title);
    wxBoxSizer *create_item_label(wxString label, const wxString tooltip = "", const wxString wiki_url = "");
    wxBoxSizer *create_item_combobox(wxString title, wxString tooltip, std::string param, std::vector<wxString> vlist, std::function<void(wxString)> onchange = {}, const wxString wiki_url = "");
-    wxBoxSizer *create_item_combobox(wxString title, wxString tooltip, std::string param, std::vector<wxString> vlist, std::vector<std::string> config_name_index, const wxString wiki_url = "");
+    wxBoxSizer *create_item_combobox(wxString title, wxString tooltip, std::string param, std::vector<wxString> vlist, std::vector<std::string> config_name_index, std::function<void(std::string)> onchange = {}, const wxString wiki_url = "");
    wxBoxSizer *create_item_region_combobox(wxString title, wxString tooltip);
    wxBoxSizer *create_item_language_combobox(wxString title, wxString tooltip);
    wxBoxSizer *create_item_loglevel_combobox(wxString title, wxString tooltip, std::vector<wxString> vlist);
@@ -57,7 +57,9 @@ PrivacyUpdateDialog::PrivacyUpdateDialog(wxWindow* parent, wxWindowID id, const

    fs::path ph(resources_dir());
    ph /= "tooltip/privacyupdate.html";
-    m_host_url = into_u8(file_url_from_path(ph));
+    m_host_url = ph.string();
+    std::replace(m_host_url.begin(), m_host_url.end(), '\\', '/');
+    m_host_url = "file:///" + m_host_url;
    m_vebview_release_note->LoadURL(from_u8(m_host_url));
    m_sizer_right->Add(m_vebview_release_note, 0, wxEXPAND | wxRIGHT | wxLEFT, FromDIP(15));

@@ -45,10 +45,10 @@ const std::vector<std::string> license_list = {
 ProjectPanel::ProjectPanel(wxWindow *parent, wxWindowID id, const wxPoint &pos, const wxSize &size, long style) : wxPanel(parent, id, pos, size, style)
 {
    SetBackgroundColour(*wxWHITE);
-    m_project_home_url = file_url_from_path(boost::filesystem::path(resources_dir()) / "web/model/index.html");
+    m_project_home_url = wxString::Format("file://%s/web/model/index.html", from_u8(resources_dir()));
    wxString strlang = wxGetApp().current_language_code_safe();
    if (strlang != "")
-        m_project_home_url += "?lang=" + strlang;
+        m_project_home_url = wxString::Format("file://%s/web/model/index.html?lang=%s", from_u8(resources_dir()), strlang);

    wxBoxSizer* main_sizer = new wxBoxSizer(wxVERTICAL);

@@ -293,8 +293,10 @@ void ProjectPanel::OnScriptMessage(wxWebViewEvent& evt)
            if (!accessory_path.empty()) {
                std::string decode_path = wxGetApp().url_decode(accessory_path.ToStdString());
                fs::path path(decode_path);
-                if (!desktop_open_project_attachment(this, path))
-                    BOOST_LOG_TRIVIAL(warning) << "open_3mf_accessory: not opening " << decode_path;
+
+                if (fs::exists(path)) {
+                    wxLaunchDefaultApplication(path.wstring(), 0);
+                }
            }
        }
        else if (strCmd == "request_3mf_info") {
@@ -510,7 +510,7 @@ void UpdateVersionDialog::update_version_info(wxString release_note, wxString ve
        out_buf->append(text, size);
    }, (void*) &html_source, MD_DIALECT_GITHUB | MD_FLAG_STRIKETHROUGH | MD_FLAG_WIKILINKS, 0);
    html_source.append("</body></html>");
-    m_vebview_release_note->LoadURL(file_url_from_path(boost::filesystem::path(resources_dir()) / "web/guide/0/index.html"));
+    m_vebview_release_note->LoadURL("file://" + (boost::filesystem::path (resources_dir()) / "web/guide/0/index.html").string());

    SetMinSize(GetSize());
    SetMaxSize(GetSize());
@@ -4415,15 +4415,15 @@ void TabFilament::build()
        optgroup->append_single_option_line("pellet_flow_coefficient", "printer_basic_information_advanced#pellet-modded-printer");
        optgroup->append_single_option_line("filament_flow_ratio", "material_flow_ratio_and_pressure_advance#flow-ratio", 0);

-        optgroup->append_single_option_line("enable_pressure_advance", "material_flow_ratio_and_pressure_advance#pressure-advance", 0);
-        optgroup->append_single_option_line("pressure_advance", "material_flow_ratio_and_pressure_advance#pressure-advance", 0);
+        optgroup->append_single_option_line("enable_pressure_advance", "material_flow_ratio_and_pressure_advance#pressure-advance");
+        optgroup->append_single_option_line("pressure_advance", "material_flow_ratio_and_pressure_advance#pressure-advance");

        // Orca: adaptive pressure advance and calibration model
-        optgroup->append_single_option_line("adaptive_pressure_advance", "material_flow_ratio_and_pressure_advance#enable-adaptive-pressure-advance-beta", 0);
-        optgroup->append_single_option_line("adaptive_pressure_advance_overhangs", "material_flow_ratio_and_pressure_advance#enable-adaptive-pressure-advance-for-overhangs-beta", 0);
-        optgroup->append_single_option_line("adaptive_pressure_advance_bridges", "material_flow_ratio_and_pressure_advance#pressure-advance-for-bridges", 0);
+        optgroup->append_single_option_line("adaptive_pressure_advance", "material_flow_ratio_and_pressure_advance#enable-adaptive-pressure-advance-beta");
+        optgroup->append_single_option_line("adaptive_pressure_advance_overhangs", "material_flow_ratio_and_pressure_advance#enable-adaptive-pressure-advance-for-overhangs-beta");
+        optgroup->append_single_option_line("adaptive_pressure_advance_bridges", "material_flow_ratio_and_pressure_advance#pressure-advance-for-bridges");

-        Option option = optgroup->get_option("adaptive_pressure_advance_model", 0);
+        Option option = optgroup->get_option("adaptive_pressure_advance_model");
        option.opt.full_width = true;
        option.opt.is_code = true;
        option.opt.height = 15;
@@ -4432,7 +4432,7 @@ void TabFilament::build()
            DynamicPrintConfig& filament_config = m_preset_bundle->filaments.get_edited_preset().config;

            update_dirty();
-            if (opt_key.substr(0, opt_key.find('#')) == "adaptive_pressure_advance_model")
+            if (opt_key == "adaptive_pressure_advance_model")
                m_config_manipulation.check_adaptive_pressure_advance_model(&filament_config);

            on_value_change(opt_key, value);
@@ -4829,11 +4829,8 @@ void TabFilament::toggle_options()
    }
    if (m_active_page->title() == L("Filament"))
    {
-        const int selection = m_variant_combo ? m_variant_combo->GetSelection() : 0;
-        const unsigned int variant_idx = (unsigned int) std::max(selection, 0);
-
-        bool pa = m_config->opt_bool("enable_pressure_advance", variant_idx);
-        toggle_option("pressure_advance", pa, 0);
+        bool pa = m_config->opt_bool("enable_pressure_advance", 0);
+        toggle_option("pressure_advance", pa);

        //Orca: Enable the plates that should be visible when multi bed support is enabled or a BBL printer is selected; otherwise, enable only the plate visible for the selected bed type.
        DynamicConfig& proj_cfg               = m_preset_bundle->project_config;
@@ -4861,12 +4858,12 @@ void TabFilament::toggle_options()
        // Orca: adaptive pressure advance and calibration model
        // If PA is not enabled, disable adaptive pressure advance and hide the model section
        // If adaptive PA is not enabled, hide the adaptive PA model section
-        toggle_option("adaptive_pressure_advance", pa, 0);
-        toggle_option("adaptive_pressure_advance_overhangs", pa, 0);
-        bool has_adaptive_pa = m_config->opt_bool("adaptive_pressure_advance", variant_idx);
-        toggle_line("adaptive_pressure_advance_overhangs", has_adaptive_pa && pa, 0);
-        toggle_line("adaptive_pressure_advance_model", has_adaptive_pa && pa, 0);
-        toggle_line("adaptive_pressure_advance_bridges", has_adaptive_pa && pa, 0);
+        toggle_option("adaptive_pressure_advance", pa);
+        toggle_option("adaptive_pressure_advance_overhangs", pa);
+        bool has_adaptive_pa = m_config->opt_bool("adaptive_pressure_advance", 0);
+        toggle_line("adaptive_pressure_advance_overhangs", has_adaptive_pa && pa);
+        toggle_line("adaptive_pressure_advance_model", has_adaptive_pa && pa);
+        toggle_line("adaptive_pressure_advance_bridges", has_adaptive_pa && pa);

        bool is_pellet_printer = printer_cfg.opt_bool("pellet_modded_printer");
        toggle_line("pellet_flow_coefficient", is_pellet_printer);
@@ -4874,6 +4871,8 @@ void TabFilament::toggle_options()

        toggle_line("activate_chamber_temp_control", printer_cfg.opt_bool("support_chamber_temp_control"));

+        const int selection = m_variant_combo ? m_variant_combo->GetSelection() : 0;
+        const unsigned int variant_idx = (unsigned int) std::max(selection, 0);
        std::string volumetric_speed_cos = m_config->opt_string("volumetric_speed_coefficients", variant_idx);
        bool enable_fit = volumetric_speed_cos != "0 0 0 0 0 0";
        toggle_option("filament_adaptive_volumetric_speed", enable_fit, 256 + variant_idx);
@@ -5206,6 +5205,7 @@ void TabPrinter::build_fff()
        optgroup->append_single_option_line("adaptive_bed_mesh_margin", "printer_basic_information_adaptive_bed_mesh#mesh-margin");

        optgroup = page->new_optgroup(L("Accessory"), "param_accessory");
+        optgroup->append_single_option_line("nozzle_type", "printer_basic_information_accessory#nozzle-type", 0);
        optgroup->append_single_option_line("nozzle_hrc", "printer_basic_information_accessory#nozzle-hrc");
        optgroup->append_single_option_line("auxiliary_fan", "printer_basic_information_accessory#auxiliary-part-cooling-fan");
        optgroup->append_single_option_line("fan_direction");
@@ -5720,7 +5720,6 @@ if (is_marlin_flavor)

        auto optgroup = page->new_optgroup(L("Basic information"), L"param_information", -1, true);
            optgroup->append_single_option_line("nozzle_diameter", "printer_extruder_basic_information#nozzle-diameter", extruder_idx);
-            optgroup->append_single_option_line("nozzle_type", "printer_basic_information_accessory#nozzle-type", extruder_idx);
            //optgroup->append_single_option_line("nozzle_volume_type", "", extruder_idx);

            optgroup->append_single_option_line("nozzle_volume", "printer_extruder_basic_information#nozzle-volume", extruder_idx);
@@ -5732,7 +5731,7 @@ if (is_marlin_flavor)
            optgroup->m_on_change = [this, extruder_idx](const t_config_option_key& opt_key, boost::any value)
            {
                bool is_SEMM = m_config->opt_bool("single_extruder_multi_material");
-                if (is_SEMM && m_extruders_count > 1 && boost::starts_with(opt_key, "nozzle_diameter"))
+                if (is_SEMM && m_extruders_count > 1 && opt_key.find_first_of("nozzle_diameter") != std::string::npos)
                {
                    SuppressBackgroundProcessingUpdate sbpu;
                    const double new_nd = boost::any_cast<double>(value);
@@ -31,15 +31,14 @@ int UserManager::parse_json(std::string payload)
 {
    bool restored_json = false;
    json j;
-
-    //bind/unbind
-
-    try {
    json j_pre = json::parse(payload);
    if (j_pre.empty()) {
        return -1;
    }

+    //bind/unbind
+
+    try {
        if (j_pre.contains("bind")) {
            if (j_pre["bind"].contains("command")) {

@@ -38,7 +38,9 @@ DownPluginFrame::DownPluginFrame(GUI_App *pGUI) : wxDialog((wxWindow *) (pGUI->m

    // set the frame icon
    wxBoxSizer *topsizer = new wxBoxSizer(wxVERTICAL);
-    wxString TargetUrl    = file_url_from_path(boost::filesystem::path(resources_dir()) / "web/guide/6/index.html");
+    wxString TargetUrl    = from_u8((boost::filesystem::path(resources_dir()) / "web/guide/6/index.html").make_preferred().string());
+
+    TargetUrl = "file://" + TargetUrl;

    // Create the webview
    m_browser = WebView::CreateWebView(this, TargetUrl);
@@ -218,38 +218,37 @@ wxString GuideFrame::SetStartPage(GuidePage startpage, bool load)
    m_page = startpage;
    BOOST_LOG_TRIVIAL(info) << __FUNCTION__<< boost::format(" enter, load=%1%, start_page=%2%")%load%int(startpage);
    //wxLogMessage("GUIDE: webpage_1  %s", (boost::filesystem::path(resources_dir()) / "web\\guide\\1\\index.html").make_preferred().string().c_str() );
-    const wxString guide_url = file_url_from_path(boost::filesystem::path(resources_dir()) / "web/guide/0/index.html");
-    wxString TargetUrl = guide_url + "?target=1";
+    wxString TargetUrl = from_u8( (boost::filesystem::path(resources_dir()) / "web/guide/0/index.html?target=1").make_preferred().string() );
    //wxLogMessage("GUIDE: webpage_2  %s", TargetUrl.mb_str());

    if (startpage == BBL_WELCOME){
        SetTitle(_L("Setup Wizard"));
-        TargetUrl = guide_url + "?target=1";
+        TargetUrl = from_u8((boost::filesystem::path(resources_dir()) / "web/guide/0/index.html?target=1").make_preferred().string());
    } else if (startpage == BBL_REGION) {
        SetTitle(_L("Setup Wizard"));
-        TargetUrl = guide_url + "?target=11";
+        TargetUrl = from_u8((boost::filesystem::path(resources_dir()) / "web/guide/0/index.html?target=11").make_preferred().string());
    } else if (startpage == BBL_MODELS) {
        SetTitle(_L("Setup Wizard"));
-        TargetUrl = guide_url + "?target=21";
+        TargetUrl = from_u8((boost::filesystem::path(resources_dir()) / "web/guide/0/index.html?target=21").make_preferred().string());
    } else if (startpage == BBL_FILAMENTS) {
        SetTitle(_L("Setup Wizard"));

        int nSize = m_ProfileJson["model"].size();

        if (nSize>0)
-            TargetUrl = guide_url + "?target=22";
+            TargetUrl = from_u8((boost::filesystem::path(resources_dir()) / "web/guide/0/index.html?target=22").make_preferred().string());
        else
-            TargetUrl = guide_url + "?target=21";
+            TargetUrl = from_u8((boost::filesystem::path(resources_dir()) / "web/guide/0/index.html?target=21").make_preferred().string());
    } else if (startpage == BBL_FILAMENT_ONLY) {
        SetTitle("");
-        TargetUrl = guide_url + "?target=23";
+        TargetUrl = from_u8((boost::filesystem::path(resources_dir()) / "web/guide/0/index.html?target=23").make_preferred().string());
    } else if (startpage == BBL_MODELS_ONLY) {
        SetTitle("");
-        TargetUrl = guide_url + "?target=24";
+        TargetUrl = from_u8((boost::filesystem::path(resources_dir()) / "web/guide/0/index.html?target=24").make_preferred().string());
    }
    else {
        SetTitle(_L("Setup Wizard"));
-        TargetUrl = guide_url + "?target=21";
+        TargetUrl = from_u8((boost::filesystem::path(resources_dir()) / "web/guide/0/index.html?target=21").make_preferred().string());
    }

    wxString strlang = wxGetApp().current_language_code_safe();
@@ -257,6 +256,7 @@ wxString GuideFrame::SetStartPage(GuidePage startpage, bool load)
    if (strlang != "")
        TargetUrl = wxString::Format("%s&lang=%s", w2s(TargetUrl), strlang);

+    TargetUrl = "file://" + TargetUrl;
    if (load)
        load_url(TargetUrl);

@@ -1284,7 +1284,7 @@ bool GuideFrame::BuildProfileJson(const PresetBundle& bundle, bool require_all_r
                entry["vendor"]          = vp.id;
                entry["nozzle_diameter"] = nozzle_str;
                entry["materials"]       = materials_str;
-                entry["cover"]           = into_u8(file_url_from_path(cover_path));
+                entry["cover"]           = cover_path.string();
                entry["nozzle_selected"] = "";
                entry["sub_path"]        = "";
                m_ProfileJson["model"].push_back(entry);
@@ -1405,26 +1405,23 @@ bool GuideFrame::BuildProfileDataFromVendors()
        // is served from the shipped profiles. Each is stamped by name and
        // version alone: a profile change requires a version bump, so those two
        // determine content wherever the vendor's copy sits.
-        std::vector<PresetBundle::VendorSource> ordered;
-        json stamps = json::array();
-        auto add_vendor = [&ordered, &stamps](const std::string& name, const boost::filesystem::path& dir) {
+        struct VendorSource { std::string name; boost::filesystem::path dir; std::string version; };
+        std::vector<VendorSource> ordered;
+        auto add_vendor = [&ordered](const std::string& name, const boost::filesystem::path& dir) {
            // The version a load from `dir` would serve: the profile's where one
            // exists (a cache is only served while it covers the profile beside
            // it), the cache's own stamp where the cache is the whole vendor.
            // A profile without a version (blacklist.json) carries no presets
            // and is passed over.
            const boost::filesystem::path profile = dir / (name + ".json");
-            std::string version;
            if (boost::filesystem::exists(profile)) {
                const Semver v = get_version_from_json(profile.string());
-                if (! v.valid())
-                    return;
-                version = v.to_string();
+                if (v.valid())
+                    ordered.push_back({name, dir, v.to_string()});
            } else {
-                version = VendorCacheFile::peek_version((dir / (name + ".opc")).string(), name);
+                ordered.push_back({name, dir,
+                    VendorCacheFile::peek_version((dir / (name + ".opc")).string(), name)});
            }
-            ordered.push_back({name, dir});
-            stamps.push_back({name, version});
        };
        const std::string filament_library(PresetBundle::ORCA_FILAMENT_LIBRARY);
        if (auto it = vendor_sources.find(filament_library); it != vendor_sources.end())
@@ -1434,6 +1431,9 @@ bool GuideFrame::BuildProfileDataFromVendors()
                add_vendor(name, dir);
        if (ordered.empty())
            return false;
+        json stamps = json::array();
+        for (const VendorSource& v : ordered)
+            stamps.push_back({v.name, v.version});

        // What this function derives is a pure function of that stamped set, so
        // the derived JSON is cached whole: a fresh cache makes an open one
@@ -1461,18 +1461,26 @@ bool GuideFrame::BuildProfileDataFromVendors()
        }

        // Each vendor comes from its preset cache where one covers it, which is
-        // what makes this worth doing instead of the scan below.
+        // what makes this worth doing instead of the scan below; loading into a
+        // bundle per vendor keeps the install order the startup path has.
        PresetBundle bundle;
-        std::vector<std::string> failed;
-        const std::string errors = bundle.load_vendors(ordered, ForwardCompatibilitySubstitutionRule::EnableSilent,
-                                                       /*allow_cache=*/true, m_cancel_token.get(), &failed).second;
-        if (*m_cancel_token || bundle.vendors.empty())
-            return false;
-        if (! errors.empty())
-            BOOST_LOG_TRIVIAL(warning) << "GuideFrame: loading the vendors reported: " << errors;
-        // A vendor that failed to load sends this open to the scan below, which lists
-        // what it can read of every vendor.
-        if (! failed.empty())
+        auto load_vendor = [](PresetBundle& into, const std::string& vendor,
+                              const boost::filesystem::path& dir, const PresetBundle* base) {
+            into.load_vendor_configs_from_json(dir.string(), vendor, PresetBundle::LoadSystem,
+                                               ForwardCompatibilitySubstitutionRule::EnableSilent, base);
+        };
+        for (const VendorSource& v : ordered) {
+            if (*m_cancel_token)
+                return false;   // as in the scan below: a vendor without a cache is parsed, and that takes time
+            if (v.name == filament_library) {
+                load_vendor(bundle, v.name, v.dir, nullptr);
+            } else {
+                PresetBundle tmp;
+                load_vendor(tmp, v.name, v.dir, &bundle);
+                bundle.merge_presets(std::move(tmp));
+            }
+        }
+        if (bundle.vendors.empty())
            return false;
        if (! BuildProfileJson(bundle, /*require_all_resource_vendors=*/false))
            return false;
@@ -1724,7 +1732,7 @@ int GuideFrame::LoadProfileFamily(std::string strVendor, std::string strFilePath
                    cover_path = (boost::filesystem::absolute(boost::filesystem::path(resources_dir()) / "/web/image/printer/") / cover_file)
                                     .make_preferred();
            }
-            OneModel["cover"]                  = into_u8(file_url_from_path(cover_path));
+            OneModel["cover"]                  = cover_path.string();

            OneModel["nozzle_selected"] = "";

@@ -599,7 +599,7 @@ void ZUserLogin::OnScriptResponseMessage(wxCommandEvent &WXUNUSED(evt))

 bool  ZUserLogin::ShowErrorPage()
 {
-    wxString ErrortUrl = file_url_from_path(boost::filesystem::path(resources_dir()) / "web/login/error.html");
+    wxString ErrortUrl = from_u8((boost::filesystem::path(resources_dir()) / "web\\login\\error.html").make_preferred().string());
    load_url(ErrortUrl);

    return true;
@@ -36,10 +36,10 @@ namespace GUI {
 WebViewPanel::WebViewPanel(wxWindow *parent)
        : wxPanel(parent, wxID_ANY, wxDefaultPosition, wxDefaultSize)
 {
-    wxString url = file_url_from_path(boost::filesystem::path(resources_dir()) / "web/homepage/index.html");
+    wxString url = wxString::Format("file://%s/web/homepage/index.html", from_u8(resources_dir()));
    wxString strlang = wxGetApp().current_language_code_safe();
    if (strlang != "")
-        url += "?lang=" + strlang;
+        url = wxString::Format("file://%s/web/homepage/index.html?lang=%s", from_u8(resources_dir()), strlang);

    wxBoxSizer* topsizer = new wxBoxSizer(wxVERTICAL);
    
@@ -1,6 +1,5 @@
 #include "MultiNozzleSync.hpp"

-#include "../GUI.hpp"
 #include "../GUI_App.hpp"
 #include "../I18N.hpp"
 #include "../Plater.hpp"
@@ -22,6 +21,8 @@
 #include <set>

 #include <wx/choice.h>
+#include <wx/filename.h>
+#include <wx/filesys.h>
 #include <wx/sizer.h>
 #include <wx/stattext.h>

@@ -640,7 +641,8 @@ NozzleListTable::NozzleListTable(wxWindow* parent) : wxPanel(parent,wxID_ANY,wxD
    m_web_view->AddScriptMessageHandler("nozzleListTable");
    m_web_view->EnableContextMenu(false);
    fs::path filepath = fs::path(resources_dir()) / "web/flush/NozzleListTable.html";
-    wxString url = file_url_from_path(filepath);
+    wxFileName fn(wxString::FromUTF8(filepath.string()));
+    wxString url = wxFileSystem::FileNameToURL(fn);
    m_web_view->LoadURL(url);

    auto sizer = new wxBoxSizer(wxVERTICAL);
@@ -48,19 +48,20 @@ constexpr char ORCA_BRIDGE_JS[] = R"JS(

 wxString bootstrap_url()
 {
-    return file_url_from_path(boost::filesystem::path(resources_dir()) / BOOTSTRAP_PAGE);
+    return wxString("file://") + from_u8((boost::filesystem::path(resources_dir()) / BOOTSTRAP_PAGE).make_preferred().string());
 }

 wxString content_base_url()
 {
-    return file_url_from_path(boost::filesystem::path(resources_dir()) / "web") + "/";
+    const std::string dir = (boost::filesystem::path(resources_dir()) / "web").make_preferred().string();
+    return wxString("file://") + from_u8(dir) + "/";
 }

 bool is_content_url(const wxString& url)
 {
-    // The web view reports the URL it parsed, which may escape the resources path differently
-    // from content_base_url().
-    return wxURI::Unescape(url.BeforeFirst('#')) == wxURI::Unescape(content_base_url());
+    // The web view reports the URL it parsed, which escapes anything the resources path holds
+    // (a space, a non-ASCII character), while content_base_url() is the raw path.
+    return wxURI::Unescape(url.BeforeFirst('#')) == content_base_url();
 }

 const char* orca_bridge_script() { return ORCA_BRIDGE_JS; }
@@ -192,7 +192,7 @@ bool WebViewHostDialog::create_webview(const std::string& resource_path,

 wxString WebViewHostDialog::build_resource_url(const std::string& resource_path) const
 {
-    wxString target_url = file_url_from_path(boost::filesystem::path(resources_dir()) / resource_path);
+    wxString target_url = from_u8((boost::filesystem::path(resources_dir()) / resource_path).make_preferred().string());

    if (append_language_to_url()) {
        const wxString lang = wxGetApp().current_language_code_safe();
@@ -202,7 +202,7 @@ wxString WebViewHostDialog::build_resource_url(const std::string& resource_path)
        }
    }

-    return target_url;
+    return wxString("file://") + target_url;
 }

 void WebViewHostDialog::load_url(const wxString& url)
@@ -464,7 +464,7 @@ WipingDialog::WipingDialog(wxWindow* parent, const int max_flush_volume) :
    wxString filepath_str = from_path(filepath);
    wxFileName fn(filepath_str);
    if(fn.FileExists()) {
-        wxString url = file_url_from_path(filepath);
+        wxString url = wxFileSystem::FileNameToURL(fn);
        BOOST_LOG_TRIVIAL(debug) << __FUNCTION__<< "File exists and load url " << url.ToStdString();
        m_webview->LoadURL(url);
        BOOST_LOG_TRIVIAL(debug) << __FUNCTION__<< "Successfully loaded url: " << url.ToStdString();
@@ -274,4 +274,13 @@ bool Duet::start_print(wxString &msg, const std::string &filename, ConnectionTyp
 	return res;
 }

+int Duet::get_err_code_from_body(const std::string &body) const
+{
+	pt::ptree root;
+	std::istringstream iss (body); // wrap returned json to istringstream
+	pt::read_json(iss, root);
+
+	return root.get<int>("err", 0);
+}
+
 }
@@ -40,6 +40,7 @@ private:
 	ConnectionType connect(wxString &msg) const;
 	void disconnect(ConnectionType connectionType) const;
 	bool start_print(wxString &msg, const std::string &filename, ConnectionType connectionType, bool simulationMode) const;
+	int get_err_code_from_body(const std::string &body) const;
 };

 }
@@ -146,6 +146,15 @@ bool ESP3D::start_print(wxString& msg, const std::string& filename) const
    return ret;
 }

+int ESP3D::get_err_code_from_body(const std::string& body) const
+{
+    pt::ptree          root;
+    std::istringstream iss(body); // wrap returned json to istringstream
+    pt::read_json(iss, root);
+
+    return root.get<int>("err", 0);
+}
+
 // ESP3D only accepts 8.3 filenames else it crashes marlin and other undefined behaviour
 std::string ESP3D::get_short_name(const std::string& filename) const
 {
@@ -33,6 +33,7 @@ private:
    std::string m_console_port;

    bool        start_print(wxString& msg, const std::string& filename) const;
+    int         get_err_code_from_body(const std::string& body) const;
    std::string get_short_name(const std::string& filename) const;
    std::string format_command(const std::string& path, const std::string& arg, const std::string& val) const;
 };
@@ -340,7 +340,9 @@ namespace Slic3r {
        if (classify_printer_model(config->opt_string("printer_model")) != ElegooPrinterType::CC2)
            return fallback_webui;

-        std::string web_path = GUI::into_u8(GUI::file_url_from_path(boost::filesystem::path(resources_dir()) / "web/elegoolink/lan_service_web/index.html"));
+        std::string web_path = resources_dir() + "/web/elegoolink/lan_service_web/index.html";
+        std::replace(web_path.begin(), web_path.end(), '\\', '/');
+        web_path = "file://" + web_path;
        const std::string token   = get_cc2_token(config->opt_string("printhost_apikey"));
        const std::string host_ip = Http::get_host_header_value(host);

--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
SoftFever	12b6d6b9ba	Merge branch 'main' into hanif/preview-drag-detail	2026-09-29 16:14:34 +08:00
Hanif Koh	c6d89d6978	Hide Infill in the Shell Drag Mode Only Where the Profile Covers It A profile with no top or bottom shell layers, or no walls, leaves the infill on the surface, so hiding it changed the picture. The viewer now reads the print's default region settings when it loads a print and leaves the infill in place for such a print; per-object overrides are not consulted.	2026-09-28 17:10:54 +08:00
Hanif Koh	abecef53b0	Keep Only the Solid Model and Shell Modes While Dragging The skip-layers and outer-walls modes drew one layer in every N, and every visual complaint on the review came from the gaps that leaves at close range. The shell mode draws every layer and looks the same from outside, and the solid model is the one mode whose cost does not depend on the toolpaths, so the two of them cover what the stride modes were for. The layer stride goes with them; a saved preference naming a removed mode falls back to off.	2026-09-28 17:10:54 +08:00
Hanif Koh	44d5a22a32	Add a Shell-Only Drag Mode That Keeps What Can Be Seen From Outside A third mode of the drag preference: the reduced set keeps every role but the sparse infill, internal solid infill, internal bridge infill and gap fill, which lie under the skins or between the walls, on every layer. Walls, top and bottom surfaces, bridges, supports and the prime tower are drawn whole, so from outside the print looks as it does at rest, and the two end layers of the visible range stay whole as in every mode. The roles come from the slicer, so the classification is exact wherever the slicer's is. What a role cannot tell apart is the inside of the prime tower or of a support from its outside; both are kept whole. A profile with no top or bottom shell layers exposes infill, which this mode hides.	2026-09-28 17:10:54 +08:00
Hanif Koh	dec146f1e6	Let the User Choose What the Preview Draws While Dragging The solid model is one answer to a preview that cannot keep up with a drag; a reviewer asked for the two that keep the drag view made of toolpaths. The checkbox is now a combobox, "Simplify preview while dragging", with Off, Solid model, Skip layers and Outer walls, and a spin, "Draw one layer in every N", for the toolpath modes. Off is the default, and with it nothing is built. Skip layers keeps one layer in every N. Outer walls keeps the outer and overhang perimeters of those layers, so the prime tower and supports, whose segments have other roles, drop out of it. Both keep the bottom and top layers of the visible range whole, as the solid model does, so the faces the range cuts open stay what was printed there. libvgcode takes the choice as EReducedDetailMode and a stride; the sets are rebuilt when either changes, and drawing from the reduced one is still a buffer binding. A mode change reaches the loaded preview at once, as the checkbox did.	2026-09-28 16:20:11 +08:00
Hanif Koh	a9fec0ffc4	Release the Reduced Set When Unused and Share the Drag Check With the Scene Cache The reduced index buffers were only re-uploaded while the preference was on, so the last set stayed allocated until the next load once it was switched off, and their size was missing from get_used_gpu_memory(). They are now uploaded on every rebuild, empty when nothing was built, and counted. The scene cache and the solid model both asked whether the user was dragging, with different lists: the cache knew about gizmos and the rectangle selection, the solid model about the navigator and the sliders. One is_user_interacting() now answers both. The tooltip says that negative volumes are not cut out of the solid model, since load_shells() drops every non-model-part volume, and the preferences handler keeps the dimming comment with the branch it documents.	2026-09-28 16:20:11 +08:00
Hanif Koh	9ab6bbebf0	Offer the Sliced Objects as a Solid Model While Dragging The G-code preview draws every toolpath segment as an instanced box, and its frame cost is linear in the number of segments drawn. On a plate of large objects that is enough that dragging the camera or a preview slider cannot keep up, and no amount of per-segment work changes that; only drawing fewer segments does. The objects themselves are cheaper: a mesh costs its triangles once, however many layers it has, and the preview already loads the objects as shells for its translucent ghost. A new preference, "Only render solid model when dragging" (off by default), draws those shells opaque in their filament colours instead of the toolpaths while the user drags. The visible layer range still holds. The shells are cut at the range's top and bottom through the gouraud shader's z range, and libvgcode keeps a second index buffer holding just the range's bottom and top layers, filled in the same walk as the full one, which is drawn afterwards so that it caps the cut with what was really printed there. Switching between the two sets is a buffer binding, never a rebuild. The prime tower is added to the shells from its sliced mesh while the preference is on, positioned as the print placed it; it keeps its opaque colour and so stays out of the translucent ghost. Supports have no mesh and are not shown. Dragging is the camera, the navigator or either slider being held; a slider reports it from ImGui's active id, since its dirty flag is raised and consumed inside one frame. A wheel step holds the solid model for a 150 ms settle time, with the frame that restores the toolpaths scheduled for when it runs out. The switch is decided at the top of the frame, before the cached scene is consulted, and a frame that switches redraws the scene. A drag cut short by focus or capture loss is ended explicitly, and a button release wakes the idle loop, since on some platforms no idle event follows it until the next input. With the preference off, nothing is built and the preview is unchanged.	2026-09-28 16:20:11 +08:00