fix: clang-tidy

## Speeds up OrcaSlicer incremental rebuild on Linux

Profiled `build_linux_image.sh`: 96 s, of which 51 s in the dependency
audit.

**`appimage_is_elf_file()`** ran `file` and `grep` per candidate. An
AppDir holds ~9.6k of them, 4.8k being the bundled Python runtime and
none of them ELF: ~19k processes, 14 s. Reads the four-byte magic
instead. Checked against the old result on 4000 files, no disagreement.

**The dependency walk** popped its queue with `"${queue[@]:1}"`, which
rebuilds the whole array each time. At ~4.8k entries that was 22 s of
copying an array around. Uses a read index.

Audit still passes. `shellcheck` v0.11.0, the version CI uses, is clean.

## Notes
The 96 s -> 12.7 s. Measured on a 32-core / 48 GB machine, but the audit
is a serial bash loop, so cores and RAM is not the bottleneck. On slower
hardware the saving should be larger

## Images
<img width="1987" height="782" alt="Screenshot_20261007_092516"
src="https://github.com/user-attachments/assets/96fcb917-38e5-49e7-8cbe-b37be1a2f23a"
/>
<img width="1807" height="742" alt="Screenshot_20261007_092621"
src="https://github.com/user-attachments/assets/4a65ffae-4d59-41f0-a1c7-ee5b49f3c4be"
/>

.claude/skills/orca-profiles/references/extruder-variants.md

@@ -105,11 +105,12 @@ Rules:
    `single_extruder_multi_material` off, and in the app when the printer tab loads a printer with a
    different number of extruders, the pair is rebuilt from `extruder_variant_list` (one
    `Direct Drive Standard` per extruder when the list is absent) and the variant arrays are resized to
-   the rebuilt pair, padded with their first value or cut. The resize skips the `machine_max_*` limits
-   and `hotend_heating_rate` / `hotend_cooling_rate`: they keep their width, and an extruder beyond it
-   reads their first value, so extruder 2 and up of a list-less printer take extruder 1's normal limit
-   as their silent one too. With the three in agreement that changes nothing; a pair written without
-   the list is replaced. A listed variant the pair lacks is a menu choice that reads variant index 0.
+   the rebuilt pair, padded with their first value or cut. The `machine_max_*` limits are padded the
+   same way, so extruder 2 and up of a list-less printer take extruder 1's normal limit as their
+   silent one too. The resize skips `hotend_heating_rate` / `hotend_cooling_rate`: they keep their
+   width, and an extruder beyond it reads their first value. With the three in agreement that changes
+   nothing; a pair written without the list is replaced. A listed variant the pair lacks is a menu
+   choice that reads variant index 0.
    - The pair without `extruder_variant_list` slices, but the sidebar offers no variant switch and
      the app cannot add variants to a list-less process: nothing is lost while every extruder
      has exactly one variant, and every further variant is unreachable.

docs/HLSD/multi-extruder-ams.md

@@ -0,0 +1,195 @@
+# Multi-extruder and multi-AMS device control
+
+`DeviceManager`/`MachineObject` model the toolheads, AMS units, and filament slots of a connected
+printer and drive the device-control UI from that model. The model represents the counts as
+device-reported runtime values rather than compile-time caps, so a printer with an arbitrary number
+of toolheads, several AMS units, and a non-uniform number of slots per unit is handled by the same
+code paths. The printer agent is responsible for translating its printer's state into the shared
+JSON dialect this model consumes; the agent boundary is described in
+[printer-agent.md](printer-agent.md), and this document describes the dialect and the model.
+
+## Model layout
+
+`MachineObject` owns the device subsystems that this document covers:
+
+- `DevExtderSystem` — the toolheads (extruders) and their per-toolhead filament/temperature state.
+- `DevFilaSystem` — the AMS units (`DevAms`) and their trays (`DevAmsTray`).
+- `DevNozzleSystem` — the nozzles and, on rack printers, `DevNozzleRack`.
+- `DevFilaSwitch` — a filament switch that can feed several AMS units to more than one extruder.
+
+Each subsystem exposes its own count — `DevExtderSystem::GetTotalExtderCount()`,
+`DevFilaSystem::GetAmsCount()`, `DevAms::GetSlotCount()` — and the rest of the application derives
+its layout from those values rather than from fixed assumptions.
+
+## Wire dialect
+
+The dialect is the Bambu-shaped JSON that `DeviceManager` and `MachineObject` already consume. An
+agent whose printer speaks something else is expected to translate into it; the agent is not free
+to invent a new shape. Two representations coexist for extruders, and one for AMS/slots.
+
+### Extruders
+
+The generic representation is `print.device.extruder`, parsed by
+`ExtderSystemParser::ParseV2_0` (`DevExtruderSystem.cpp`). It has a packed `state` integer and an
+`info` array with one object per toolhead:
+
+```text
+device.extruder.state           packed integer
+  bits  0..3   total extruder count
+  bits  4..7   current extruder id
+  bits  8..11  target extruder id
+  bits 12..14  switch state
+  bits 15..18  currently loading extruder id
+  bit   19     busy for loading
+
+device.extruder.info[]          one entry per toolhead
+  id          extruder id
+  filam_bak   array of backup-group bits
+  info        bit 1 has filament, bit 2 buffer has filament, bit 3 nozzle present
+  temp        bits 0..15 current temperature, bits 16..31 target temperature
+  spre        slot_id bits 0..7, ams_id bits 8..15 (previous)
+  snow        same packing (current)
+  star        same packing (target)
+  stat        bit 0..15 AMS status, bits 16..31 RFID status
+  hnow        current nozzle id
+```
+
+The legacy single/dual representation is the pair of scalar fields `nozzle_temper` /
+`nozzle_target_temper`, plus the `print.ams.tray_tar` / `tray_now` tray pointer, parsed by
+`ExtderSystemParser::ParseV1_0`. That parser is a fallback and only fills the main extruder when the
+reported toolhead count is one.
+
+Physical extruder ids are fixed (`MAIN_EXTRUDER_ID = 0`, `DEPUTY_EXTRUDER_ID = 1`). Bambu printers
+present the two toolheads as a left/right pair and invert the physical-to-logical mapping; generic
+printers use the toolhead id itself as the logical id. `DevNozzle::GetLogicExtruderId()` /
+`GetExtruderId()` centralise that distinction.
+
+### AMS units and slots
+
+AMS units arrive as `print.ams.ams[]` and are parsed by `DevFilaSystemParser::ParseV1_0`. Each unit
+carries an `id` and an `info` bitfield:
+
+```text
+info bits  0..3    type: 0 dummy, 1 AMS, 2 AMS-Lite, 3 N3F, 4 N3S, 5 AMS-Lite-mixed (N9)
+info bits  8..11   bound extruder id (0xE marks a switch-bound unit)
+info bits 24..27   switch inlet when the unit is switch-bound
+```
+
+`DevAmsType` (`DevDefs.h`) enumerates the resulting unit kinds: `EXT_SPOOL`, `AMS`, `AMS_LITE`,
+`N3F`, `N3S`, and the `AMS_LITE_MIXED` N9 variant. `AMS_LITE_MIXED` reports itself as `AMS_LITE` to
+generic callers; code that needs the distinction uses `IsAmsLiteMixed()`.
+
+A unit whose bound-extruder nibble is `0xE` is switch-bound: it is kept only when a `DevFilaSwitch`
+is installed, in which case its extruder id is pinned to the main extruder and its binding set
+becomes `{0, 1}`; otherwise the unit is dropped from the AMS list.
+
+Each unit owns a map of `DevAmsTray` keyed by the tray id from the payload. The slot count is a
+property of the unit kind and the reported trays:
+
+- `AMS`, `AMS_LITE`, and `N3F` report four slots on Bambu printers, matching the firmware contract;
+- `N3S` reports one slot;
+- `EXT_SPOOL` and any non-Bambu unit report the number of trays actually present.
+
+The tray ids are the payload's slot indices; they are expected to be unique, 0-based, and contiguous
+within a unit, because the generic tray-index mapping below is cumulative.
+
+Bulk/extended spools are carried by `print.vir_slot`, which `DeviceManager` parses into
+`MachineObject::vt_slot`. Two ids are fixed: `VIRTUAL_TRAY_MAIN_ID = 255` (extruder 0) and
+`VIRTUAL_TRAY_DEPUTY_ID = 254` (extruder 1); the id convention is `vt_id = 255 - extruder_id`, so
+further extruders use 253, 252, … . The `vir_slot` parser recognises the 255/254 pair; the agent
+filament descriptor path `DevFilaSystemParser::ParseAgentFilament` is the entry that stores a fuller
+descending set in `vt_slot`.
+
+## Mapping
+
+Several subsystems relate AMS units, trays, and extruders, and more than one place derives a tray
+index. The Bambu mapping path (`DevMappingUtil`) computes `ams_id * 4 + slot_id` and knows only the
+Bambu unit kinds; `DevFilaSystem` provides the device model's own mapping below. The two agree for
+Bambu units and diverge for a non-Bambu unit whose slot count is not four.
+
+### AMS id to extruder id
+
+`DevFilaSystem::GetExtruderIdByAmsId()` resolves an AMS id to the extruder it feeds:
+
+- an AMS unit returns its bound extruder (`DevAms::GetExtruderId()`);
+- a virtual tray returns `VIRTUAL_TRAY_MAIN_ID - vt_id`;
+- Bambu's virtual AMS ids map to the main/deputy extruder.
+
+A unit may be bound to more than one extruder when a `DevFilaSwitch` feeds it; the binding set
+(`DevAms::m_binded_extruder_set`) and switch inlet are read by switch-aware code while the
+single-extruder id stays pinned for legacy callers.
+
+### Tray index
+
+`DevFilaSystem::GetTrayIndexMap()` maps a global tray index to an `(ams_id, slot_id)` pair and is
+used for backup-slot translation, calibration addressing, and the mapping popups.
+
+- Bambu AMS: `ams_id * 4 + slot_id`; N3S: the AMS id; AMS-Lite-mixed (N9): `24 + slot_id`.
+- Generic (non-Bambu): a running lane index — the count of trays in preceding units plus the slot
+  id. This depends on each unit's tray ids being 0-based and contiguous.
+
+### Virtual-slot recognition
+
+`devPrinterUtil::IsVirtualSlot()` decides whether an id denotes a virtual tray. On Bambu printers it
+is the fixed pair `{255, 254}`. On generic printers it is the descending range
+`[255 - count + 1, 255]`, where `count` is the selected printer preset's extruder count. The preset
+is expected to match the connected device; when the two disagree the virtual range is wrong, which
+is why a mismatch is reported rather than silently accepted.
+
+## Device-control UI
+
+The device-control widgets follow the same device-reported counts.
+
+- `AMSModel` (`AMSItem.hpp`) mirrors `DevAmsType` numerically: `EXT_AMS`, `GENERIC_AMS`, `AMS_LITE`,
+  `N3F_AMS`, `N3S_AMS`. A plain `AMS` maps to `GENERIC_AMS`.
+- On non-Bambu printers `use_generic_ams_layout()` routes `GENERIC_AMS` units through a variable-lane
+  rendering that draws one lane per reported tray; Bambu keeps its fixed four-slot rendering.
+- `AMSControl` picks its layout by vendor: Bambu keeps the left/right presentation
+  (`CreateAmsSingleNozzle` for one toolhead, `CreateAmsDoubleNozzle` for two), while non-Bambu
+  printers use `CreateAmsMultiNozzle`, which builds one preview and one AMS simplebook per toolhead
+  for any count.
+- The status panel's `ExtruderImage` renders one per-toolhead state per nozzle and is resized to
+  `GetTotalExtderCount()`. Non-Bambu printers choose the active toolhead through
+  `m_generic_nozzle_selector` (shown when more than one toolhead exists); Bambu keeps its left/right
+  `m_nozzle_btn_panel`. Nozzle temperature controls are created on demand per toolhead.
+
+## Constraints
+
+- **Single dialect.** The agent translates its protocol into this JSON; the model does not learn
+  vendor protocols. Extending the model with a new unit kind or field means extending the dialect.
+- **Agent-produced counts.** Toolhead, AMS, and slot counts come from the device payload. Nothing
+  caps them at two toolheads or four slots except the Bambu contract described above.
+- **Extruder dialect invariants.** `device.extruder.state`'s count field must equal the length of
+  `info[]`, and `info[]` must be ordered by extruder id with `id` equal to the array index: the
+  parser places toolheads by array position while `GetExtderById()` indexes by id.
+- **Preset/device agreement.** The generic layout and virtual-slot range derive their count from the
+  selected printer preset. A printer preset must therefore declare the same number of
+  `nozzle_diameter` entries as the device has toolheads; a mismatch is surfaced because the sidebar
+  and extruder logic would otherwise disagree.
+- **Bambu compatibility.** Bambu-specific presentation (left/right pair, fixed 4-slot units, fixed
+  virtual ids, physical/logical inversion) is preserved behind the vendor check. Generic paths do
+  not alter it.
+- **Tray-index invariant.** The generic tray-index map is cumulative, so payload tray ids must be
+  unique, 0-based, and contiguous per unit. A malformed id is a producer error.
+- **Protocol markers.** The dialect has no neutral equivalent for some Bambu state, so agents that
+  lack it send empty `print.cfg`, `print.fun`, `print.aux`, and `print.stat`. Their presence selects
+  the new-protocol parse path; they are compatibility markers, not feature switches.
+
+## Main implementation locations
+
+- [`DevExtruderSystem`](../../src/slic3r/GUI/DeviceCore/DevExtruderSystem.h) — toolhead model and the
+  `device.extruder` parser
+- [`DevFilaSystem`](../../src/slic3r/GUI/DeviceCore/DevFilaSystem.h) — AMS/tray model, the AMS parser,
+  and the mapping helpers
+- [`DevDefs.h`](../../src/slic3r/GUI/DeviceCore/DevDefs.h) — `DevAmsType`, extruder ids, and virtual
+  tray ids
+- [`DeviceManager.cpp`](../../src/slic3r/GUI/DeviceManager.cpp) — message dispatch, `vir_slot`
+  parsing, and device state assembly
+- [`AMSControl.cpp`](../../src/slic3r/GUI/Widgets/AMSControl.cpp) — per-toolhead AMS panes
+  (`CreateAmsMultiNozzle`) and the generic layout
+- [`AMSItem.hpp`](../../src/slic3r/GUI/Widgets/AMSItem.hpp) — `AMSModel` and the variable-lane AMS
+  rendering
+- [`StatusPanel.cpp`](../../src/slic3r/GUI/StatusPanel.cpp) — `ExtruderImage`, the toolhead selector,
+  and per-toolhead temperature controls
+- [`MoonrakerPrinterAgent.cpp`](../../src/slic3r/Utils/MoonrakerPrinterAgent.cpp) — producer example
+  (AMS payload and the `device.extruder` encoding)

scripts/appimage_lib_policy.sh

@@ -23,7 +23,13 @@ appimage_is_host_library() {
 }
 
 appimage_is_elf_file() {
-    file -b "$1" 2>/dev/null | grep -q '^ELF '
+    # Read the four-byte ELF magic rather than asking file(1): this runs once per candidate, and an
+    # AppDir holds thousands of them (the bundled Python runtime alone is ~5k files, none of them
+    # ELF). Two processes per call made this ~14 s of a ~95 s image build on its own.
+    local magic
+    [[ -f "$1" && -r "$1" ]] || return 1
+    IFS= read -r -n 4 -d '' magic < "$1" 2>/dev/null
+    [[ $magic == $'\177ELF' ]]
 }
 
 appimage_list_direct_dependencies() {

src/dev-utils/platform/unix/build_linux_image.sh.in

@@ -118,9 +118,13 @@ bundle_dependency_closure() {
     # (scripts/check_appimage_libs.sh).
     local -a search_dirs=("$dst_dir")
 
-    while [ ${#queue[@]} -gt 0 ]; do
-        target="${queue[0]}"
-        queue=("${queue[@]:1}")
+    # Walked with a read index rather than by reslicing the array: "${queue[@]:1}" rebuilds the whole
+    # queue on every pop, so draining it costs O(n^2). At the ~5k entries this bundle reaches that was
+    # ~22 s of the image build spent copying an array around.
+    local head=0
+    while [ "$head" -lt ${#queue[@]} ]; do
+        target="${queue[$head]}"
+        head=$((head + 1))
 
         if [ ! -e "$target" ] || ! appimage_is_elf_file "$target"; then
             continue

src/libslic3r/PrintConfig.cpp

@@ -10030,6 +10030,13 @@ static void extend_extruder_variant(DynamicPrintConfig& config, const unsigned i
             printer_extruder_variant_opt->values.insert(printer_extruder_variant_opt->values.end(), variants_list.begin(), variants_list.end());
         }
     }
+
+    // 3. Size the machine limits to the rebuilt variants, padded with their first value like the other variant keys.
+    // They are not extruder option keys, so the resize loop in set_num_extruders skips them.
+    const auto &defaults = FullPrintConfig::defaults();
+    for (const std::string &key : printer_options_with_variant_2)
+        if (auto *opt = config.option<ConfigOptionFloats>(key))
+            opt->resize(config.get_parameter_size(key, num_extruders), defaults.option(key));
 }
 
 void DynamicPrintConfig::set_num_extruders(unsigned int num_extruders)

src/slic3r/GUI/DeviceCore/DevDefs.h

@@ -163,8 +163,8 @@ public:
     ~devPrinterUtil() = delete;
 
 public:
-    static bool IsVirtualSlot(int ams_id) { return (ams_id == VIRTUAL_TRAY_MAIN_ID || ams_id == VIRTUAL_TRAY_DEPUTY_ID);}
-    static bool IsVirtualSlot(const std::string& ams_id) { return (ams_id == VIRTUAL_AMS_MAIN_ID_STR || ams_id == VIRTUAL_AMS_DEPUTY_ID_STR); }
+    static bool IsVirtualSlot(int ams_id);
+    static bool IsVirtualSlot(const std::string& ams_id);
 };
 
 namespace GUI
@@ -200,4 +200,4 @@ template<> struct std::hash<NozzleDef>
 };
 
 // key(extruder_id) -> { key1(nozzle type info), val1( number of the nozzle type)}
-using ExtruderNozzleInfos = std::unordered_map<int, std::unordered_map<NozzleDef, int>>;
+using ExtruderNozzleInfos = std::unordered_map<int, std::unordered_map<NozzleDef, int>>;

src/slic3r/GUI/DeviceCore/DevFilaSystem.cpp

@@ -8,6 +8,7 @@
 #include <cstdlib>
 #include <chrono>
 #include <nlohmann/json.hpp>
+#include <wx/app.h>
 #include <wx/colour.h>
 #include <string>
 #include <wx/string.h>
@@ -33,6 +34,25 @@
 using namespace nlohmann;
 
 namespace Slic3r {
+
+bool devPrinterUtil::IsVirtualSlot(int ams_id)
+{
+    if (wxTheApp == nullptr || GUI::wxGetApp().preset_bundle == nullptr || GUI::wxGetApp().preset_bundle->is_bbl_vendor())
+        return ams_id == VIRTUAL_TRAY_MAIN_ID || ams_id == VIRTUAL_TRAY_DEPUTY_ID;
+
+    const int extruder_count = GUI::wxGetApp().preset_bundle->get_printer_extruder_count();
+    return ams_id >= VIRTUAL_TRAY_MAIN_ID - extruder_count + 1 && ams_id <= VIRTUAL_TRAY_MAIN_ID;
+}
+
+bool devPrinterUtil::IsVirtualSlot(const std::string& ams_id)
+{
+    try {
+        return IsVirtualSlot(std::stoi(ams_id));
+    } catch (...) {
+        return false;
+    }
+}
+
 static int _hex_digit_to_int(const char c) { return (c >= '0' && c <= '9') ? c - '0' : (c >= 'A' && c <= 'F') ? c - 'A' + 10 : (c >= 'a' && c <= 'f') ? c - 'a' + 10 : -1; }
 
 wxColour DevAmsTray::decode_color(const std::string &color)
@@ -200,18 +220,21 @@ wxString DevAms::GetDisplayName() const
 
 int DevAms::GetSlotCount() const
 {
-    // GetAmsType() maps AMS_LITE_MIXED -> AMS_LITE, so N9 reports 4 slots like AMS-Lite.
-    auto ams_type = GetAmsType();
-    if (ams_type == AMS || ams_type == AMS_LITE || ams_type == N3F)
-    {
-        return 4;
-    }
-    else if (ams_type == N3S)
-    {
-        return 1;
+    if (wxTheApp != nullptr && GUI::wxGetApp().preset_bundle != nullptr &&
+        GUI::wxGetApp().preset_bundle->is_bbl_vendor()) {
+        // GetAmsType() maps AMS_LITE_MIXED -> AMS_LITE, so N9 reports 4 slots like AMS-Lite.
+        auto ams_type = GetAmsType();
+        if (ams_type == AMS || ams_type == AMS_LITE || ams_type == N3F)
+        {
+            return 4;
+        }
+        else if (ams_type == N3S)
+        {
+            return 1;
+        }
     }
 
-    return 1;
+    return static_cast<int>(m_trays.size());
 }
 
 DevAmsTray* DevAms::GetTray(const std::string& tray_id) const
@@ -302,13 +325,21 @@ int DevFilaSystem::GetExtruderIdByAmsId(const std::string& ams_id) const
     {
         return it->second->GetExtruderId();
     }
-    else if (stoi(ams_id) == VIRTUAL_TRAY_MAIN_ID)
-    {
-        return MAIN_EXTRUDER_ID;
+
+    const bool is_bbl_vendor = wxTheApp != nullptr && GUI::wxGetApp().preset_bundle != nullptr && GUI::wxGetApp().preset_bundle->is_bbl_vendor();
+    if (!is_bbl_vendor && GetOwner()) {
+        for (const auto& tray : GetOwner()->vt_slot) {
+            if (tray.id == ams_id)
+                return VIRTUAL_TRAY_MAIN_ID - std::stoi(ams_id);
+        }
     }
-    else if (stoi(ams_id) == VIRTUAL_TRAY_DEPUTY_ID)
-    {
+
+    if (is_bbl_vendor && ams_id == VIRTUAL_AMS_MAIN_ID_STR)
+        return MAIN_EXTRUDER_ID;
+    if (is_bbl_vendor && ams_id == VIRTUAL_AMS_DEPUTY_ID_STR)
         return DEPUTY_EXTRUDER_ID;
+    if (!is_bbl_vendor && devPrinterUtil::IsVirtualSlot(ams_id)) {
+        return VIRTUAL_TRAY_MAIN_ID - std::stoi(ams_id);
     }
 
     assert(false && __FUNCTION__);
@@ -325,9 +356,22 @@ std::string DevFilaSystem::GetNozzleFlowStringByAmsId(const std::string& ams_id)
 std::map<int, DevAmsSlotId> DevFilaSystem::GetTrayIndexMap()
 {
     std::map<int, DevAmsSlotId> tray_id_map;
-    tray_id_map[VIRTUAL_TRAY_MAIN_ID]   = DevAmsSlotId{VIRTUAL_TRAY_MAIN_ID, 0};
-    tray_id_map[VIRTUAL_TRAY_DEPUTY_ID] = DevAmsSlotId{VIRTUAL_TRAY_DEPUTY_ID, 0};
+    const bool is_bbl_vendor = wxTheApp != nullptr && GUI::wxGetApp().preset_bundle != nullptr && GUI::wxGetApp().preset_bundle->is_bbl_vendor();
+    if (is_bbl_vendor) {
+        tray_id_map[VIRTUAL_TRAY_MAIN_ID]   = DevAmsSlotId{VIRTUAL_TRAY_MAIN_ID, 0};
+        tray_id_map[VIRTUAL_TRAY_DEPUTY_ID] = DevAmsSlotId{VIRTUAL_TRAY_DEPUTY_ID, 0};
+    } else if (GetOwner()) {
+        for (const auto& tray : GetOwner()->vt_slot) {
+            try {
+                const int tray_id = std::stoi(tray.id);
+                tray_id_map[tray_id] = DevAmsSlotId{tray_id, 0};
+            } catch (...) {
+                BOOST_LOG_TRIVIAL(warning) << __FUNCTION__ << " invalid virtual tray id: " << tray.id;
+            }
+        }
+    }
 
+    int generic_tray_index = 0;
     for (auto& [ams_id, ams_item] : GetAmsList()) {
         for (auto &[slot_id, slot_item] : ams_item->GetTrays()) {
             if (ams_item && slot_item) {
@@ -335,9 +379,11 @@ std::map<int, DevAmsSlotId> DevFilaSystem::GetTrayIndexMap()
                     int ams_id_int  = stoi(ams_id);
                     int slot_id_int = stoi(slot_id);
                     int tray_index  = -1;
-                    if (ams_item->GetAmsType() == DevAms::N3S) {
+                    if (!is_bbl_vendor) {
+                        tray_index = generic_tray_index + slot_id_int;
+                    } else if (ams_item->GetAmsType() == DevAms::N3S) {
                         tray_index = ams_id_int;
-                    } else if(ams_item->GetAmsType() == DevAms::AMS_LITE && ams_item->IsAmsLiteMixed()) {
+                    } else if (ams_item->GetAmsType() == DevAms::AMS_LITE && ams_item->IsAmsLiteMixed()) {
                         tray_index = 24 + slot_id_int;
                     } else {
                         tray_index = (ams_id_int * 4 + slot_id_int);
@@ -348,6 +394,8 @@ std::map<int, DevAmsSlotId> DevFilaSystem::GetTrayIndexMap()
                 }
             }
         }
+        if (!is_bbl_vendor)
+            generic_tray_index += static_cast<int>(ams_item->GetTrays().size());
     }
 
     return  tray_id_map;
@@ -913,6 +961,8 @@ void DevFilaSystemParser::ParseAgentFilament(const json& data, MachineObject* ob
             }
 
             ams->m_exist               = true;
+            ams->m_binded_extruder_set = {ext_id};
+            ams->m_binded_switcher_pos.reset();
             ams->m_current_temperature = u.value("temperature", (float) INVALID_AMS_TEMPERATURE);
             ams->m_humidity_percent    = u.value("humidity_percent", -1);
             ams->m_left_dry_time       = u.value("dry_time_min", 0);
@@ -995,16 +1045,22 @@ void DevFilaSystemParser::ParseAgentFilament(const json& data, MachineObject* ob
     }
 
     // --- external / direct spools -> obj->vt_slot ---
-    // extruder 0 -> main virtual slot, extruder >0 -> deputy.
+    // Keep one virtual slot per extruder. The legacy two-extruder mapping uses
+    // 255 for extruder 0 and 254 for extruder 1; continue that sequence for
+    // additional extruders (253, 252, ...).
     if (obj && data.contains("external") && data["external"].is_array())
     {
+        std::map<int, DevAmsTray> external_slots;
         obj->vt_slot.clear();
         for (const auto& e : data["external"])
         {
             if (!e.is_object())
                 continue;
             const int  ext   = e.value("extruder", MAIN_EXTRUDER_ID);
-            const int  vt_id = (ext == MAIN_EXTRUDER_ID) ? VIRTUAL_TRAY_MAIN_ID : VIRTUAL_TRAY_DEPUTY_ID;
+            if (ext < MAIN_EXTRUDER_ID || ext > VIRTUAL_TRAY_MAIN_ID)
+                continue;
+
+            const int  vt_id = VIRTUAL_TRAY_MAIN_ID - ext;
             DevAmsTray tray(std::to_string(vt_id));
             tray.is_exists       = e.value("loaded", false);
             tray.m_fila_type     = e.value("material", std::string());
@@ -1013,8 +1069,11 @@ void DevFilaSystemParser::ParseAgentFilament(const json& data, MachineObject* ob
             tray.nozzle_temp_min = std::to_string(e.value("nozzle_temp_min", 0));
             tray.nozzle_temp_max = std::to_string(e.value("nozzle_temp_max", 0));
             tray.remain          = e.value("remain_percent", -1);
-            obj->vt_slot.push_back(tray);
+            external_slots.insert_or_assign(ext, std::move(tray));
         }
+
+        for (auto& entry : external_slots)
+            obj->vt_slot.push_back(std::move(entry.second));
     }
 }
 

src/slic3r/GUI/DeviceCore/DevFilaSystem.h

@@ -349,7 +349,7 @@ public:
     DevAmsTray* GetAmsTray(const std::string& ams_id, const std::string& tray_id) const;
     void        CollectAmsColors(std::vector<wxColour>& ams_colors) const;
 
-    // Map a linear tray index -> {ams_id, slot_id}. Includes the two virtual (external-spool) trays,
+    // Map a linear tray index -> {ams_id, slot_id}. Includes virtual external-spool trays,
     // N3S single-slot units, and the A2L/N9 AMS-Lite-mixed layout (trays 24-27).
     std::map<int, DevAmsSlotId> GetTrayIndexMap();
 
@@ -434,4 +434,4 @@ struct DevFilamentDryingPreset
     float filament_dev_ams_drying_heat_distortion_temperature = 0.0f;
 };
 
-}// namespace Slic3r
+}// namespace Slic3r

src/slic3r/GUI/DeviceCore/DevNozzleSystem.cpp

@@ -13,6 +13,7 @@
 #include "slic3r/GUI/DeviceCore/DevDefs.h"
 #include "libslic3r/PrintConfig.hpp"
 #include <boost/log/trivial.hpp>
+#include <wx/app.h>
 #include <wx/string.h>
 #include <string>
 #include "libslic3r/CommonDefs.hpp"
@@ -27,6 +28,7 @@
 #include <unordered_map>
 #include <optional>
 #include <cmath>
+#include "slic3r/GUI/GUI_App.hpp"
 
 using json = nlohmann::json;
 
@@ -176,34 +178,52 @@ DevFirmwareVersionInfo DevNozzle::GetFirmwareInfo() const
 int DevNozzle::GetLogicExtruderId() const
 {
     int total_ext_count = GetTotalExtruderCount();
-    if (total_ext_count == 1) {
-        return LOGIC_UNIQUE_EXTRUDER_ID;
-    } else if (total_ext_count == 2) {
-        if (AtLeftExtruder()) {
-            return LOGIC_L_EXTRUDER_ID;
-        } else if (AtRightExtruder()) {
-            return LOGIC_R_EXTRUDER_ID;
+
+    const bool is_bbl_vendor = wxTheApp != nullptr && GUI::wxGetApp().preset_bundle != nullptr &&
+                               GUI::wxGetApp().preset_bundle->is_bbl_vendor();
+    if (is_bbl_vendor) {
+        if (total_ext_count == 1) {
+            return LOGIC_UNIQUE_EXTRUDER_ID;
+        } else if (total_ext_count == 2) {
+            if (AtLeftExtruder()) {
+                return LOGIC_L_EXTRUDER_ID;
+            } else if (AtRightExtruder()) {
+                return LOGIC_R_EXTRUDER_ID;
+            }
         }
+
+        assert(0);
+        return LOGIC_UNIQUE_EXTRUDER_ID;
     }
 
-    assert(0);
-    return LOGIC_UNIQUE_EXTRUDER_ID;
+    // For some reason, BBL's logical extruder ID is inverted:
+    // physical extruder id = 0 (MAIN_EXTRUDER_ID) vs logical extruder id = 1 (LOGIC_R_EXTRUDER_ID)
+    // Likely because logical id reads from left to right (left = 0, right = 1)
+    // For generic N extruders, this inversion does not apply.
+    if (IsOnRack()) return INVALID_EXTRUDER_ID;
+    return m_nozzle_id;
 }
 
 int DevNozzle::GetExtruderId() const
 {
-    int total_ext_count = GetTotalExtruderCount();
-    if (total_ext_count == 1) {
-        return MAIN_EXTRUDER_ID;
-    } else if (total_ext_count == 2) {
-        if (AtRightExtruder()) {
+    const bool is_bbl_vendor = wxTheApp != nullptr && GUI::wxGetApp().preset_bundle != nullptr &&
+                               GUI::wxGetApp().preset_bundle->is_bbl_vendor();
+    if (is_bbl_vendor) {
+        int total_ext_count = GetTotalExtruderCount();
+        if (total_ext_count == 1) {
             return MAIN_EXTRUDER_ID;
-        } else if (AtLeftExtruder()) {
-            return DEPUTY_EXTRUDER_ID;
+        } else if (total_ext_count == 2) {
+            if (AtRightExtruder()) {
+                return MAIN_EXTRUDER_ID;
+            } else if (AtLeftExtruder()) {
+                return DEPUTY_EXTRUDER_ID;
+            }
         }
+    
+        return MAIN_EXTRUDER_ID;
     }
 
-    return MAIN_EXTRUDER_ID;
+    return m_nozzle_id;
 }
 
 bool DevNozzle::AtLeftExtruder() const

src/slic3r/GUI/DeviceManager.cpp

@@ -65,6 +65,7 @@
 #include <unordered_set>
 #include <utility>
 #include <vector>
+#include <wx/app.h>
 #include <wx/colour.h>
 #include <tuple>
 #include <wx/dir.h>
@@ -1274,19 +1275,24 @@ int MachineObject::get_bed_temperature_limit()
 
 bool MachineObject::is_filament_installed()
 {
-    if (m_extder_system->GetTotalExtderCount() > 0) {
-        // right//or single
-        auto ext = m_extder_system->m_extders[MAIN_EXTRUDER_ID];
-        if (ext.m_ext_has_filament) {
+    // if (m_extder_system->GetTotalExtderCount() > 0) {
+    //     // right//or single
+    //     auto ext = m_extder_system->m_extders[MAIN_EXTRUDER_ID];
+    //     if (ext.m_ext_has_filament) {
+    //         return true;
+    //     }
+    // }
+    // /*left*/
+    // if (m_extder_system->GetTotalExtderCount() > 1) {
+    //     auto ext = m_extder_system->m_extders[DEPUTY_EXTRUDER_ID];
+    //     if (ext.m_ext_has_filament) {
+    //         return true;
+    //     }
+    // }
+
+    for (auto& ext : m_extder_system->m_extders) {
+        if (ext.m_ext_has_filament)
             return true;
-        }
-    }
-    /*left*/
-    if (m_extder_system->GetTotalExtderCount() > 1) {
-        auto ext = m_extder_system->m_extders[DEPUTY_EXTRUDER_ID];
-        if (ext.m_ext_has_filament) {
-            return true;
-        }
     }
     return false;
 }
@@ -5263,16 +5269,17 @@ DevAmsTray MachineObject::parse_vt_tray(json vtray)
 
 bool MachineObject::contains_tray(const std::string &ams_id, const std::string &tray_id) const
 {
-    if (ams_id != VIRTUAL_AMS_MAIN_ID_STR && ams_id != VIRTUAL_AMS_DEPUTY_ID_STR) {
-
+    const bool is_bbl_vendor = wxTheApp != nullptr && GUI::wxGetApp().preset_bundle != nullptr && GUI::wxGetApp().preset_bundle->is_bbl_vendor();
+    if (is_bbl_vendor && ams_id != VIRTUAL_AMS_MAIN_ID_STR && ams_id != VIRTUAL_AMS_DEPUTY_ID_STR)
         return m_fila_system->GetAmsTray(ams_id, tray_id) != nullptr;
-    } else {
+
+    if (!is_bbl_vendor || ams_id == VIRTUAL_AMS_MAIN_ID_STR || ams_id == VIRTUAL_AMS_DEPUTY_ID_STR) {
         for (const auto& tray : vt_slot) {
-            if (tray.id == ams_id) { return true; }
+            if (tray.id == ams_id) return true;
         }
     }
 
-    return false;
+    return !is_bbl_vendor && m_fila_system->GetAmsTray(ams_id, tray_id) != nullptr;
 }
 
 DevAmsTray MachineObject::get_tray(const std::string &ams_id, const std::string &tray_id) const
@@ -5282,13 +5289,19 @@ DevAmsTray MachineObject::get_tray(const std::string &ams_id, const std::string
         return DevAmsTray(tray_id);
     }
 
-    if (ams_id != VIRTUAL_AMS_MAIN_ID_STR && ams_id != VIRTUAL_AMS_DEPUTY_ID_STR) {
+    const bool is_bbl_vendor = wxTheApp != nullptr && GUI::wxGetApp().preset_bundle != nullptr && GUI::wxGetApp().preset_bundle->is_bbl_vendor();
+    if (is_bbl_vendor && ams_id != VIRTUAL_AMS_MAIN_ID_STR && ams_id != VIRTUAL_AMS_DEPUTY_ID_STR) {
         auto tray = m_fila_system->GetAmsTray(ams_id, tray_id);
-        if (tray) { return *tray;};
+        if (tray) return *tray;
     }
-    else {
+    else if (!is_bbl_vendor || ams_id == VIRTUAL_AMS_MAIN_ID_STR || ams_id == VIRTUAL_AMS_DEPUTY_ID_STR) {
         for (const auto &tray : vt_slot) {
-            if (tray.id == ams_id) { return tray; }
+            if (tray.id == ams_id) return tray;
+        }
+
+        if (!is_bbl_vendor) {
+            auto tray = m_fila_system->GetAmsTray(ams_id, tray_id);
+            if (tray) return *tray;
         }
     }
 

src/slic3r/GUI/PublishSettingsDialog.cpp

@@ -14,6 +14,7 @@
 #include "Widgets/DialogButtons.hpp"
 #include "Widgets/StaticLine.hpp"
 #include "Widgets/StateColor.hpp"
+#include "Widgets/SwitchButton.hpp"
 
 #include "libslic3r/PrintConfig.hpp"
 #include "libslic3r/Preset.hpp"
@@ -864,34 +865,25 @@ void PublishSettingsDialog::build_option_model()
     };
 
     // --- Phase 1: printer per-extruder retraction settings (first, mirroring the sidebar's
-    // Printer group), from the printer tab's "Extruder"/"Extruder N" pages. One inner tab per
-    // extruder (e.g. "Left Extruder"/"Right Extruder" via Tab::translate_category), each holding
-    // that extruder's Retraction and Z-Hop rows with per-extruder "#N" values.
+    // Printer group), from the printer tab's "Extruder" page. One inner tab per extruder (named
+    // as on the printer tab's switch, e.g. "Left Extruder"/"Right Extruder" via
+    // Tab::translate_category), each holding that extruder's Retraction and Z-Hop rows with
+    // per-extruder "#N" values.
     {
         size_t g = section_group_for(Section::Printer);
         std::set<std::string> printer_added;
         for (Tab* tab : wxGetApp().tabs_list) {
-            if (tab->m_type != Preset::TYPE_PRINTER)
+            // The page's controls edit the extruder chosen on the printer tab's switch, so its
+            // option list is read once per extruder.
+            auto*       printer_tab = dynamic_cast<TabPrinter*>(tab);
+            const Page* page        = printer_tab ? printer_tab->extruder_page() : nullptr;
+            if (page == nullptr)
                 continue;
-            for (const PageShp& page : tab->m_pages) {
-                if (!page->title().StartsWith("Extruder"))
-                    continue;
-                // The extruder index of this page: its options are appended with the same
-                // "#N" opt_index (opt.second.second), so derive the tab's index from the first
-                // allowlisted option; skip the page when none is found (defensive).
-                int extruder_idx = -1;
-                for (const ConfigOptionsGroupShp& optgroup : page->m_optgroups) {
-                    if (optgroup->title != "Retraction" && optgroup->title != "Z-Hop")
-                        continue;
-                    for (const auto& opt : optgroup->opt_map())
-                        if (extruder_idx < 0)
-                            extruder_idx = opt.second.second;
-                    if (extruder_idx >= 0)
-                        break;
-                }
-                if (extruder_idx < 0)
-                    continue;
-                const wxString page_title = Tab::translate_category(page->title(), tab->m_type);
+            const size_t extruders_count = printer_tab->m_extruders_count;
+            for (size_t extruder_idx = 0; extruder_idx < extruders_count; ++extruder_idx) {
+                const wxString page_title = Tab::translate_category(extruders_count > 1 ? wxString::Format("Extruder %d", int(extruder_idx + 1)) : wxString("Extruder"), tab->m_type);
+                // Retraction and Z-Hop values are stored per variant column, not per extruder.
+                const int variant_index = printer_tab->extruder_variant_index(int(extruder_idx));
                 for (const ConfigOptionsGroupShp& optgroup : page->m_optgroups) {
                     // Allowlist on the untranslated optgroup title; the "Retraction when
                     // switching material" group is intentionally skipped.
@@ -899,17 +891,17 @@ void PublishSettingsDialog::build_option_model()
                         continue;
                     const wxString subcategory = _(optgroup->title);
                     for (const auto& opt : optgroup->opt_map()) {
-                        const std::string& opt_id   = opt.first;
                         const std::string& pure_key = opt.second.first;
                         // Rows are keyed by the full per-extruder "#N" opt_id so each extruder
                         // tab publishes its own value; GetPublishedKeys() emits the checked rows
                         // as-is.
+                        const std::string opt_id = pure_key + "#" + std::to_string(variant_index);
                         if (!printer_added.insert(opt_id).second)
                             continue;
                         wxString label, value, unit;
                         if (!option_text(opt_id, pure_key, label, value, unit))
                             continue;
-                        size_t cat_index = category_index_for(page_title, Section::Printer, g, size_t(extruder_idx));
+                        size_t cat_index = category_index_for(page_title, Section::Printer, g, extruder_idx);
                         size_t sub_index = subcategory_index_for(cat_index, subcategory, optgroup->icon);
                         add_row_ui(opt_id, label, value, unit, cat_index, sub_index);
                     }
@@ -1098,6 +1090,10 @@ void PublishSettingsDialog::build_option_model()
     for (SectionGroup& section : m_sections)
         if (!section.categories.empty())
             section.tabs->SelectItem(0);
+    // Orca: the Printer section shows its extruders on the same switch as the printer tab's Extruder page.
+    for (size_t s = 0; s < m_sections.size(); ++s)
+        if (m_sections[s].kind == Section::Printer && m_sections[s].categories.size() > 1)
+            setup_variant_switch(s);
     if (!m_sections.empty()) {
         m_outer_tabs->SelectItem(0);
         show_outer_page(0);
@@ -1630,6 +1626,8 @@ void PublishSettingsDialog::show_inner_page(size_t section_index, int inner_inde
         section.selected_mixed = -1;
     }
     section.selected_inner = inner_index;
+    if (section.variant_switch != nullptr)
+        section.variant_switch->SetSelection(inner_index); // fires its event, which ignores the shown page
     Category& category     = m_categories[section.categories[inner_index]];
     category.page->Show();
     category.scroll->FitInside();
@@ -1639,6 +1637,32 @@ void PublishSettingsDialog::show_inner_page(size_t section_index, int inner_inde
     section.page_host_sizer->Layout();
 }
 
+void PublishSettingsDialog::setup_variant_switch(size_t section_index)
+{
+    SectionGroup& section = m_sections[section_index];
+    std::vector<wxString> titles;
+    for (size_t category : section.categories)
+        titles.push_back(m_categories[category].title);
+
+    section.variant_switch = new MultiSwitchButton(section.page);
+    section.variant_switch->SetFitToOptions();
+    section.variant_switch->SetOptions(titles);
+    section.variant_switch->SetSelection(section.selected_inner);
+    section.variant_switch->Bind(wxCUSTOMEVT_MULTISWITCH_SELECTION, [this, section_index](wxCommandEvent& evt) {
+        evt.Skip();
+        // The hidden tab strip stays the selection model; its event shows the page.
+        SectionGroup& sec = m_sections[section_index];
+        if (evt.GetInt() != sec.selected_inner)
+            sec.tabs->SelectItem(evt.GetInt());
+    });
+
+    // The switch takes the place of the tab strip, centered like on the printer tab.
+    wxSizer* page_sizer = section.page->GetSizer();
+    page_sizer->Insert(1, section.variant_switch, 0, wxALIGN_CENTER_HORIZONTAL | wxTOP, FromDIP(4));
+    section.tabs->Hide();
+    section.page->Layout();
+}
+
 void PublishSettingsDialog::show_mixed_page(size_t section_index, int mixed_index)
 {
     if (section_index >= m_sections.size())
@@ -2184,6 +2208,13 @@ void PublishSettingsDialog::refresh_tab_indicators()
         for (size_t i = 0; i < section.categories.size(); ++i) {
             const bool on = category_has_selection(m_categories[section.categories[i]]);
             section.tabs->SetItemIndicator(static_cast<unsigned int>(i), on);
+            // The switch has no indicator dot; mark its option text instead.
+            if (section.variant_switch != nullptr) {
+                const wxString& title = m_categories[section.categories[i]].title;
+                const wxString  text  = on ? title + wxString(" ") + wxString(wxUniChar(0x2022)) : title;
+                if (section.variant_switch->GetOptionText(static_cast<unsigned int>(i)) != text)
+                    section.variant_switch->SetOptionText(static_cast<unsigned int>(i), text);
+            }
             any = any || on;
         }
         if (section.mixed_tabs != nullptr)
@@ -2248,6 +2279,8 @@ void PublishSettingsDialog::on_dpi_changed(const wxRect& suggested_rect)
         section.tabs->Rescale();
         if (section.mixed_tabs != nullptr)
             section.mixed_tabs->Rescale();
+        if (section.variant_switch != nullptr)
+            section.variant_switch->Rescale();
     }
 
     // Refresh the per-row Color chips at the new DPI (they carry the slot number too).

src/slic3r/GUI/PublishSettingsDialog.hpp

@@ -37,6 +37,7 @@ namespace Slic3r { class DynamicPrintConfig; }
 class TextInput;
 class StaticLine;
 class CheckBox;
+class MultiSwitchButton;
 
 namespace Slic3r { namespace GUI {
 
@@ -195,6 +196,10 @@ private:
         ScalableBitmap icon_bmp;      // tab icon next to the title; rescaled on DPI change
         wxPanel* page{nullptr};
         TabCtrl* tabs{nullptr};
+        // Printer section with several extruders: the extruder switch shown instead of `tabs`, the
+        // same MultiSwitchButton (and option names) as the printer tab's Extruder page. One option
+        // per entry of `categories`, named by its title; `tabs` stays as the hidden selection model.
+        MultiSwitchButton* variant_switch{nullptr};
         // Second tab strip, below the main one, listing only the mixed-color filament slots.
         // Present on the Material section only (null elsewhere).
         TabCtrl* mixed_tabs{nullptr};
@@ -277,6 +282,8 @@ private:
     bool row_is_visible(const Row& row) const;
     void apply_visibility();
     void bind_tab_events();
+    // Replaces a section's inner tab strip with a variant switch (see SectionGroup::variant_switch).
+    void setup_variant_switch(size_t section_index);
 
     TabCtrl* m_outer_tabs{nullptr};
     wxPanel* m_outer_host{nullptr};

src/slic3r/GUI/StatusPanel.hpp

@@ -1,6 +1,8 @@
 #ifndef slic3r_StatusPanel_hpp_
 #define slic3r_StatusPanel_hpp_
 
+#include <vector>
+
 #include "libslic3r/ProjectTask.hpp"
 #include "DeviceManager.hpp"
 #include "MonitorPage.hpp"
@@ -66,6 +68,7 @@
 #include "StagedBuild.hpp"
 
 class StepIndicator;
+class wxChoice;
 
 #define COMMAND_TIMEOUT         5
 
@@ -140,28 +143,35 @@ class ExtruderImage : public wxWindow
     ScalableBitmap *m_left_extruder_active_empty;
     ScalableBitmap *m_left_extruder_unactive_filled;
     ScalableBitmap *m_left_extruder_unactive_empty;
+
     ScalableBitmap *m_right_extruder_active_filled;
     ScalableBitmap *m_right_extruder_active_empty;
     ScalableBitmap *m_right_extruder_unactive_filled;
     ScalableBitmap *m_right_extruder_unactive_empty;
-
+    
     ScalableBitmap *m_extruder_single_nozzle_empty_load;
     ScalableBitmap *m_extruder_single_nozzle_empty_unload;
     ScalableBitmap *m_extruder_single_nozzle_filled_load;
     ScalableBitmap *m_extruder_single_nozzle_filled_unload;
-
+    
     ExtruderState m_left_ext_state   = {ExtruderState::EMPTY_LOAD};
     ExtruderState m_right_ext_state  = {ExtruderState::EMPTY_LOAD};
     ExtruderState m_single_ext_state = {ExtruderState::EMPTY_LOAD};
+    std::vector<ExtruderState> m_multi_extruder_states;
+    bool m_generic_nozzle_display{false};
 
 public:
     void update(int nozzle_num, int nozzle_id);
     void update(ExtruderState single_state);
     void update(ExtruderState right_state, ExtruderState left_state);
 
+    void update(ExtruderState state, int idx);
+
     void msw_rescale();
     void setExtruderCount(int nozzle_num);
+    void setGenericNozzleDisplay(bool enabled);
     void setExtruderUsed(std::string loc);
+    void setExtruderUsed(int nozzle_idx);
     void paintEvent(wxPaintEvent &evt);
 
     void     render(wxDC &dc);
@@ -495,6 +505,8 @@ protected:
     std::vector<ExtruderImage *> m_extruderImage;
 
     SwitchBoard *   m_nozzle_btn_panel;
+    wxChoice*       m_generic_nozzle_selector{nullptr};
+    int             m_generic_nozzle_selector_count{0};
 
     wxStaticText *  m_text_tasklist_caption;
 
@@ -507,10 +519,23 @@ protected:
     wxBoxSizer *    m_misc_ctrl_sizer;
     StaticBox*      m_fan_panel;
     StaticLine *    m_line_nozzle;
-    TempInput*      m_tempCtrl_nozzle;
+    wxWindowID      m_nozzle_temp_control_id{wxID_ANY};
+    wxWindow*       m_temp_nozzle_parent{nullptr};
+    wxBoxSizer*     m_temp_nozzle_sizer{nullptr};
+    size_t          m_temp_nozzle_active_count{0};
+    TempInput*      m_tempCtrl_nozzle{nullptr};
     int             m_temp_nozzle_timeout{ 0 };
-    TempInput*      m_tempCtrl_nozzle_deputy;
+    TempInput*      m_tempCtrl_nozzle_deputy{nullptr};
     int             m_temp_nozzle_deputy_timeout{ 0 };
+
+    std::vector<TempInput*> m_tempCtrl_nozzles;
+    std::vector<int> m_temp_nozzle_timeouts;
+
+    // Last (dev_id, device toolhead count, preset nozzle count) we warned about, to avoid log spam.
+    std::string m_last_mismatch_dev_id;
+    int         m_last_mismatch_device_count{-1};
+    int         m_last_mismatch_preset_count{-1};
+
     TempInput *     m_tempCtrl_bed;
     int             m_temp_bed_timeout {0};
     TempInput *     m_tempCtrl_chamber;
@@ -550,6 +575,7 @@ protected:
 
     /* AMS control box <-> live nozzle-rack panel toggle (rack printers only) */
     SwitchBoard*    m_ams_rack_switch{ nullptr };
+    MultiSwitchButton* m_ams_nozzle_switch{ nullptr };
 
     AMSControl*     m_ams_control;
     StaticBox*      m_ams_control_box;
@@ -624,6 +650,9 @@ public:
 
     wxBoxSizer *create_temp_axis_group(wxWindow *parent);
     wxBoxSizer *create_temp_control(wxWindow *parent);
+    TempInput* create_nozzle_temp_control(wxWindow *parent, wxWindowID id);
+    void set_temp_input_colors(TempInput* temp_ctrl);
+    void ensure_nozzle_temp_controls(size_t count);
     wxBoxSizer *create_misc_control(wxWindow *parent);
     wxBoxSizer *create_axis_control(wxWindow *parent);
     wxPanel *create_bed_control(wxWindow *parent);
@@ -654,6 +683,7 @@ private:
     friend class MonitorPanel;
     void wire_controls();
     bool load_thumbnail_from_url(const wxString &url, MachineObject *obj);
+    void sync_nozzle_temp_controls(size_t count);
 
 protected:
     std::shared_ptr<SliceInfoPopup> m_slice_info_popup;
@@ -801,6 +831,7 @@ protected:
     void update_cloud_subtask(MachineObject *obj);
     void update_sdcard_subtask(MachineObject *obj);
     void update_temp_ctrl(MachineObject *obj);
+    void check_extruder_count_mismatch(MachineObject* obj);
     void update_misc_ctrl(MachineObject *obj);
     void update_ams(MachineObject* obj);
     void update_rack(MachineObject* obj);

src/slic3r/GUI/Tab.cpp

@@ -811,6 +811,12 @@ wxString Tab::translate_category(const wxString& title, Preset::Type preset_type
         }
         return _("Extruder") + title.SubString(8, title.Last());
     }
+    // Orca: one "Extruder" page serves all extruders; name it "Extruders" when there are several.
+    if (preset_type == Preset::TYPE_PRINTER && title == "Extruder") {
+        auto preset = wxGetApp().preset_bundle;
+        if (preset && preset->get_printer_extruder_count() > 1)
+            return _("Extruders");
+    }
     return _(title);
 }
 
@@ -1153,6 +1159,38 @@ std::string Tab::options_list_storage_key(const std::string& opt_key) const
     return (serialized || is_plugin_field) ? opt_key : opt_key + "#0";
 }
 
+// Orca: deep_diff() flags every vector entry at or past the reference vector's length as changed,
+// whatever its value (e.g. the values of an extruder added by raising the extruder count). A vector
+// grows by copying its first entry (ConfigOptionVector::resize), so such an entry only counts as
+// changed when it differs from the reference's first entry, as before Orca's deep_diff() change.
+// The change of the count itself shows on "extruders_count".
+static void drop_unchanged_added_entries(std::vector<std::string> &options, const DynamicPrintConfig &current, const Preset *reference)
+{
+    if (reference == nullptr)
+        return;
+    // deep_diff() lists a key's entries one after another, so serialize each key's vectors once.
+    std::string              serialized_key;
+    std::vector<std::string> cur_values;
+    std::string              ref_first;
+    options.erase(std::remove_if(options.begin(), options.end(), [&](const std::string &opt) {
+        const auto pos = opt.find('#');
+        if (pos == std::string::npos)
+            return false;
+        const std::string key = opt.substr(0, pos);
+        const size_t      idx = size_t(std::atoi(opt.c_str() + pos + 1));
+        auto ref = dynamic_cast<const ConfigOptionVectorBase *>(reference->config.option(key));
+        auto cur = dynamic_cast<const ConfigOptionVectorBase *>(current.option(key));
+        if (ref == nullptr || cur == nullptr || idx < ref->size() || ref->size() == 0 || idx >= cur->size())
+            return false;
+        if (key != serialized_key) {
+            serialized_key = key;
+            cur_values     = cur->vserialize();
+            ref_first      = ref->vserialize().front();
+        }
+        return cur_values[idx] == ref_first;
+    }), options.end());
+}
+
 void Tab::update_all_extruder_options_status()
 {
     if (!m_extruder_switch && !m_variant_combo) {
@@ -1183,6 +1221,8 @@ void Tab::update_all_extruder_options_status()
 
     auto dirty_options = m_presets->current_dirty_options(true);
     auto nonsys_options = m_presets->current_different_from_parent_options(true);
+    if (m_type == Preset::TYPE_PRINTER)
+        update_custom_dirty(dirty_options, nonsys_options);
     auto filter_extruder_options = [](const std::vector<std::string>& options) {
         std::vector<std::string> filtered_options;
         for (const auto& opt : options) {
@@ -1231,7 +1271,7 @@ void Tab::update_extruder_switch_colors()
 
         if (m_active_page) {
             if (m_active_page->title() == "Speed" || m_active_page->title() == "Motion ability" || m_active_page->title() == "Filament" ||
-                m_active_page->title() == "Setting Overrides" || m_active_page->title() == "Multimaterial") {
+                m_active_page->title() == "Setting Overrides" || m_active_page->title() == "Multimaterial" || is_printer_extruder_page(m_active_page)) {
                 for (auto page_ptr : m_pages) {
                     if (page_ptr.get() == m_active_page) {
                         pages_to_check.push_back(page_ptr);
@@ -1262,8 +1302,8 @@ void Tab::update_extruder_switch_colors()
 void Tab::check_extruder_options_status(int index, bool &sys_extruder, bool &modified_extruder, const std::vector<PageShp>& pages_to_check)
 {
     int config_index = index;
+    int extruder_id  = index;
     if (m_type == Preset::TYPE_PRINT || m_type == Preset::TYPE_PRINTER || m_type == Preset::TYPE_MODEL) {
-        int extruder_id;
         NozzleVolumeType nozzle_type;
         parse_extruder_selection(index, extruder_id, nozzle_type);
 
@@ -1296,6 +1336,10 @@ void Tab::check_extruder_options_status(int index, bool &sys_extruder, bool &mod
                 }
 
                 std::string target_opt_key = base_opt_key + "#" + std::to_string(config_index * stride);
+                // Orca: on the printer's Extruder page only per-variant options use the variant column,
+                // the others (nozzle_diameter, extruder_offset, ...) are indexed by the extruder.
+                if (is_printer_extruder_page(page.get()) && printer_options_with_variant_1.count(base_opt_key) == 0)
+                    target_opt_key = base_opt_key + "#" + std::to_string(extruder_id);
 
                 auto status_iter = m_all_extruder_options_status.find(target_opt_key);
                 if (status_iter != m_all_extruder_options_status.end()) {
@@ -1336,18 +1380,6 @@ void TabPrinter::init_options_list()
     Tab::init_options_list();
     if (m_printer_technology == ptFFF)
         m_options_list.emplace("extruders_count", m_opt_status_value);
-    for (size_t i = 1; i < m_extruders_count; ++i) {
-        wxString target_title = wxString::Format("Extruder %d", int(i + 1));
-        for (auto &page : m_pages) {
-            if (page->title() == target_title) {
-                for (auto group : page->m_optgroups) {
-                    for (auto &opt : group->opt_map())
-                        m_options_list.emplace(opt.first, m_opt_status_value);
-                }
-                break;
-            }
-        }
-    }
 }
 
 void TabPrinter::msw_rescale()
@@ -1437,7 +1469,7 @@ void Tab::update_changed_tree_ui()
                     get_sys_and_mod_flags("compatible_printers", sys_page, modified_page);
                 }
             }
-            if (page->title() == "Speed" || page->title() == "Motion ability" || page->title() == "Filament" || page->title() == "Setting Overrides" || page->title() == "Multimaterial") {
+            if (page->title() == "Speed" || page->title() == "Motion ability" || page->title() == "Filament" || page->title() == "Setting Overrides" || page->title() == "Multimaterial" || is_printer_extruder_page(page.get())) {
                 auto options = generate_extruder_options();
                 for (size_t switch_index = 0; switch_index < options.size(); ++switch_index) {
                     std::vector<PageShp> pages_to_check = { page };
@@ -1540,6 +1572,10 @@ void Tab::on_roll_back_value(const bool to_sys /*= true*/)
 
     m_postpone_update_ui = false;
 
+    // Orca: the restored config may have another extruder count than the tab shows.
+    if (auto printer_tab = dynamic_cast<TabPrinter *>(this))
+        printer_tab->sync_extruders_count();
+
     // When all values are rolled, then we have to update whole tab in respect to the reverted values
     update();
     if (m_active_page)
@@ -1877,6 +1913,17 @@ static wxString pad_combo_value_for_config(const DynamicPrintConfig &config)
     return config.opt_bool("pad_enable") ? (config.opt_bool("pad_around_object") ? _("Around object") : _("Below object")) : _("None");
 }
 
+// Rebuilds the variant switch of every tab that has one, e.g. after the extruder count or a nozzle volume type changed.
+static void update_all_extruder_variants(int extruder_idx = -1)
+{
+    for (auto tab : wxGetApp().tabs_list)
+        tab->update_extruder_variants(extruder_idx);
+    if (auto tab = wxGetApp().plate_tab)
+        tab->update_extruder_variants(extruder_idx);
+    for (auto tab : wxGetApp().model_tabs_list)
+        tab->update_extruder_variants(extruder_idx);
+}
+
 void Tab::on_value_change(const std::string& opt_key, const boost::any& value)
 {
     // Orca:
@@ -2319,15 +2366,7 @@ void Tab::on_value_change(const std::string& opt_key, const boost::any& value)
 
     if (opt_key.find("nozzle_volume_type") != std::string::npos) {
         int extruder_idx = std::atoi(opt_key.substr(opt_key.find_last_of('#') + 1).c_str());
-        for (auto tab : wxGetApp().tabs_list) {
-            tab->update_extruder_variants(extruder_idx);
-        }
-        if (auto tab = wxGetApp().plate_tab) {
-            tab->update_extruder_variants(extruder_idx);
-        }
-        for (auto tab : wxGetApp().model_tabs_list) {
-            tab->update_extruder_variants(extruder_idx);
-        }
+        update_all_extruder_variants(extruder_idx);
         if (wxGetApp().app_config->get("auto_calculate_flush") == "all") {
             wxGetApp().plater()->sidebar().auto_calc_flushing_volumes(-1,extruder_idx);
         }
@@ -5685,9 +5724,13 @@ if (is_marlin_flavor)
             size_t extruders_count = size_t(boost::any_cast<int>(v));
             wxTheApp->CallAfter([this, opt_key, value, extruders_count]() {
                 if (opt_key == "extruders_count" || opt_key == "single_extruder_multi_material") {
+                    const size_t old_extruders_count = m_extruders_count;
                     extruders_count_changed(extruders_count);
                     init_options_list(); // m_options_list should be updated before UI updating
                     update_dirty();
+                    // Orca: the variant switches (here, Process in the sidebar, ...) list one option per extruder.
+                    if (m_extruders_count != old_extruders_count)
+                        update_all_extruder_variants();
                     if (opt_key == "single_extruder_multi_material") { // the single_extruder_multimaterial was added to force pages
                         on_value_change(opt_key, value);                      // rebuild - let's make sure the on_value_change is not skipped
 
@@ -5697,6 +5740,7 @@ if (is_marlin_flavor)
 // Orca: we use a different logic here. If SEMM is enabled, we set extruder count to 1.
 #if 1
                             extruders_count_changed(1);
+                            update_all_extruder_variants();
 #else
 
                             std::vector<double> nozzle_diameters =
@@ -5768,14 +5812,13 @@ if (is_marlin_flavor)
         m_pages.insert(m_pages.end() - n_after_single_extruder_MM, page);
     }
 
-    // Orca: build missed extruder pages
-    for (auto extruder_idx = m_extruders_count_old; extruder_idx < m_extruders_count; ++extruder_idx) {
-        const wxString& page_name = (m_extruders_count > 1) ? wxString::Format("Extruder %d", int(extruder_idx + 1)) : wxString::Format("Extruder");
-
-        //# build page
-        //const wxString& page_name = wxString::Format("Extruder %d", int(extruder_idx + 1));
-        auto page = add_options_page(page_name, "custom-gcode_extruder", true); // ORCA: icon only visible on placeholders
-        m_pages.insert(m_pages.begin() + n_before_extruders + extruder_idx, page);
+    // Orca: a single "Extruder" page serves all extruders. Its controls are created once for extruder 0;
+    // switch_excluder() re-targets them to the extruder selected on the variant switch (m_extruder_switch),
+    // which the printer tab shows on this page too.
+    if (extruder_page() == nullptr && m_extruders_count > 0) {
+        const size_t extruder_idx = 0;
+        auto page = add_options_page(L("Extruder"), "custom-gcode_extruder", true); // ORCA: icon only visible on placeholders
+        m_pages.insert(m_pages.begin() + n_before_extruders, page);
 
         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);
@@ -5788,8 +5831,10 @@ if (is_marlin_flavor)
             option.opt.full_width = true;
             optgroup->append_single_option_line(option, "printer_extruder_basic_information#extruder-offset-position");
 
-            optgroup->m_on_change = [this, extruder_idx](const t_config_option_key& opt_key, boost::any value)
+            optgroup->m_on_change = [this](const t_config_option_key& opt_key, boost::any value)
             {
+                // The page edits the extruder selected on the variant switch.
+                const size_t extruder_idx = size_t(get_current_active_extruder());
                 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"))
                 {
@@ -5884,22 +5929,22 @@ if (is_marlin_flavor)
             //optgroup->append_line(line);
 #endif
     }
-    // BBS. No extra extruder page for single physical extruder machine
-    // # remove extra pages
-    auto &first_extruder_title = const_cast<wxString &>(m_pages[n_before_extruders]->title());
-    if (m_extruders_count < m_extruders_count_old) {
-        m_pages.erase(	m_pages.begin() + n_before_extruders + m_extruders_count,
-                        m_pages.begin() + n_before_extruders + m_extruders_count_old);
-        if (m_extruders_count == 1)
-            first_extruder_title = wxString::Format("Extruder");
-    } else if (m_extruders_count_old == 1) {
-        first_extruder_title = wxString::Format("Extruder %d", 1);
-    }
-    auto & index = wxGetApp().sidebar().settings_index();
-    for (auto &group : m_pages[n_before_extruders]->m_optgroups) {
-        group->set_config_category_and_type(first_extruder_title, m_type);
-        for (auto &opt : group->opt_map())
-            index.add_key(opt.first + "#0", m_type, group->title, first_extruder_title, group->icon);
+
+    // The page holds only the "#0" controls, so register every extruder's options with the search
+    // index under "Extruder N"; a search hit selects that extruder (TabPrinter::activate_option()).
+    if (Page *page = extruder_page()) {
+        auto &index = wxGetApp().sidebar().settings_index();
+        for (auto &group : page->m_optgroups) {
+            group->set_config_category_and_type(page->title(), m_type);
+            for (auto &opt : group->opt_map()) {
+                if (opt.second.second < 0)
+                    continue;
+                for (size_t i = 0; i < m_extruders_count; ++i) {
+                    const wxString category = m_extruders_count > 1 ? wxString::Format("Extruder %d", int(i + 1)) : wxString("Extruder");
+                    index.add_key(opt.second.first + "#" + std::to_string(i), m_type, group->title, category, group->icon);
+                }
+            }
+        }
     }
 
     Thaw();
@@ -6180,12 +6225,6 @@ void TabPrinter::toggle_options()
         return;
 
     auto nozzle_volumes = m_preset_bundle->project_config.option<ConfigOptionEnumsGeneric>("nozzle_volume_type");
-    auto extruders      = m_config->option<ConfigOptionEnumsGeneric>("extruder_type");
-        auto get_index_for_extruder =
-            [this, &extruders](int extruder_id, int stride = 1) {
-        return m_config->get_index_for_extruder(extruder_id + 1, "printer_extruder_id",
-            ExtruderType(extruders->values[extruder_id]), get_actual_nozzle_volume_type(extruder_id), "printer_extruder_variant", stride);
-    };
 
     //BBS: whether the preset is Bambu Lab printer
     bool is_BBL_printer = false;
@@ -6260,14 +6299,13 @@ void TabPrinter::toggle_options()
         toggle_option("tool_change_on_wipe_tower", !bSEMM && supports_wipe_tower_2 && extruders_count > 1);
         toggle_option("wait_for_temp_on_wipe_tower", !bSEMM && supports_wipe_tower_2 && extruders_count > 1);
     }
-    wxString extruder_number;
-    long val = 1;
-    if ( m_active_page->title().IsSameAs(L("Extruder")) ||
-        (m_active_page->title().StartsWith("Extruder ", &extruder_number) && extruder_number.ToLong(&val) &&
-        val > 0 && (size_t)val <= m_extruders_count))
+    if (m_active_page->title() == L("Extruder") && m_extruders_count > 0)
     {
-        size_t i = size_t(val - 1);
-        int variant_index = get_index_for_extruder(i);
+        // Orca: the single Extruder page edits the extruder selected on the variant switch; its
+        // controls carry field index 0 (i), the values are read for `extruder`.
+        const size_t i        = 0;
+        const size_t extruder = std::min<size_t>(size_t(get_current_active_extruder()), m_extruders_count - 1);
+        const int    variant_index = extruder_variant_index(int(extruder));
         bool have_retract_length = m_config->opt_float("retraction_length", variant_index) > 0;
 
         toggle_option("extruder_printable_area", false, i);          // disable
@@ -6294,7 +6332,7 @@ void TabPrinter::toggle_options()
         vec.resize(0);
         vec = {"retract_lift_above", "retract_lift_below", "retract_lift_enforce"};
         for (auto el : vec)
-          toggle_option(el, retraction && (m_config->opt_float("z_hop", i) > 0), i);
+          toggle_option(el, retraction && (m_config->opt_float("z_hop", variant_index) > 0), i);
 
         // some options only apply when not using firmware retraction
         vec.resize(0);
@@ -6347,7 +6385,7 @@ void TabPrinter::toggle_options()
         toggle_option("long_retractions_when_cut", !use_firmware_retraction && m_config->opt_int("enable_long_retraction_when_cut"), i);
         toggle_line("retraction_distances_when_cut", m_config->opt_bool("long_retractions_when_cut", variant_index), i);
 
-        toggle_option("travel_slope", m_config->opt_enum("z_hop_types", i) != ZHopType::zhtNormal, i);
+        toggle_option("travel_slope", m_config->opt_enum("z_hop_types", variant_index) != ZHopType::zhtNormal, i);
     }
 
     if (m_active_page->title() == L("Motion ability")) {
@@ -6421,12 +6459,16 @@ void TabPrinter::on_value_change(const std::string& opt_key, const boost::any& v
         return;
 
     const int pos = opt_key.find("#");
+    // Orca: fields of the single Extruder page keep index 0 but edit the selected extruder.
+    const int data_idx = pos > 0 ? extruder_page_data_index(opt_key) : -1;
 
     if (pos > 0) {
         std::string temp_str = opt_key;
         boost::erase_head(temp_str, pos + 1);
         int orig_opt_idx = static_cast<size_t>(atoi(temp_str.c_str()));
         int opt_idx = orig_opt_idx >= 0 ? orig_opt_idx : 0;
+        if (data_idx >= 0)
+            opt_idx = data_idx;
 
         std::string opt_key_pure = opt_key;
         boost::erase_tail(opt_key_pure, opt_key_pure.size() - pos);
@@ -6461,7 +6503,12 @@ void TabPrinter::on_value_change(const std::string& opt_key, const boost::any& v
         }
     }
 
-    Tab::on_value_change(opt_key, value);
+    // Orca: report Extruder page changes as "key#<extruder>", as the former "Extruder N" pages did,
+    // so per-extruder handling in Tab::on_value_change() sees the extruder that was edited.
+    if (data_idx >= 0)
+        Tab::on_value_change(opt_key.substr(0, pos) + "#" + std::to_string(get_current_active_extruder()), value);
+    else
+        Tab::on_value_change(opt_key, value);
 }
 
 void TabPrinter::update()
@@ -7393,12 +7440,7 @@ bool Tab::tree_sel_change_delayed(wxCommandEvent& event)
         // update_undo_buttons();
         this->OnActivate();
         m_parent->set_active_tab(this);
-        if (m_variant_sizer) {
-            wxWindow *variant_ctrl = m_extruder_switch ? (wxWindow *) m_extruder_switch : m_variant_combo;
-            m_main_sizer->Show(m_variant_sizer, variant_ctrl->IsThisEnabled() && !m_active_page->m_opt_id_map.empty() && !m_active_page->title().StartsWith("Extruder "));
-            if (m_extruder_sync) m_extruder_sync->Show(variant_ctrl->IsShown());
-            GetParent()->Layout();
-        }
+        update_variant_sizer_visibility();
 
         m_page_view->Thaw();
         return false;
@@ -7409,12 +7451,7 @@ bool Tab::tree_sel_change_delayed(wxCommandEvent& event)
         return false;
 
     m_active_page = page;
-    if (m_variant_sizer) {
-        wxWindow *variant_ctrl = m_extruder_switch ? (wxWindow *) m_extruder_switch : m_variant_combo;
-        m_main_sizer->Show(m_variant_sizer, variant_ctrl->IsThisEnabled() && !m_active_page->m_opt_id_map.empty() && !m_active_page->title().StartsWith("Extruder"));
-        if (m_extruder_sync) m_extruder_sync->Show(variant_ctrl->IsShown());
-        GetParent()->Layout();
-    }
+    update_variant_sizer_visibility();
 
     auto throw_if_canceled = std::function<void()>([this](){
 #ifdef WIN32
@@ -8240,9 +8277,11 @@ void Tab::update_extruder_variants(int extruder_id, bool reload)
         m_actual_nozzle_volumes.resize(extruder_nums, NozzleVolumeType::nvtStandard);
         for (int i = 0; i < extruder_nums; i++) m_actual_nozzle_volumes[i] = (NozzleVolumeType)nozzle_volumes->values[i];
 
-        // Orca: a non-Bambu dual-nozzle printer has two extruders but a single variant column, so
-        // the nozzle switch and sync button have nothing to act on. Only enable with real variants.
-        if (extruder_nums >= 2 && m_preset_bundle->support_different_extruders()) {
+        // Orca: when every extruder uses the same variant (e.g. a non-Bambu dual-nozzle printer), the
+        // switch has no nozzle variants to select and nothing to sync. The printer tab still enables it
+        // to choose the extruder its Extruder and Motion ability pages edit.
+        m_extruder_switch_variants = extruder_nums >= 2 && m_preset_bundle->support_different_extruders();
+        if (m_extruder_switch_variants || (m_type == Preset::TYPE_PRINTER && extruder_nums >= 2)) {
             auto options = generate_extruder_options();
             m_extruder_switch->SetOptions(options);
 
@@ -8281,12 +8320,8 @@ void Tab::update_extruder_variants(int extruder_id, bool reload)
     if (m_type == Preset::TYPE_PRINT) {
         update_pages_with_multi_variant();
     }
-    if (m_variant_sizer) {
-        wxWindow *variant_ctrl = m_extruder_switch ? (wxWindow *) m_extruder_switch : m_variant_combo;
-        m_main_sizer->Show(m_variant_sizer, variant_ctrl->IsThisEnabled() && m_active_page && !m_active_page->m_opt_id_map.empty() && !m_active_page->title().StartsWith("Extruder "));
-        if (m_extruder_sync) m_extruder_sync->Show(variant_ctrl->IsShown());
-        GetParent()->Layout();
-    }
+    update_extruder_switch_colors();
+    update_variant_sizer_visibility();
 }
 
 // The variant switch tags are the narrowest place a volume type is named, so they abbreviate it;
@@ -8361,12 +8396,21 @@ std::vector<wxString> Tab::generate_extruder_options()
         return options;
     }
 
+    // Orca: the printer tab has one tag per extruder, named as its former "Extruder N" pages were.
+    // parse_extruder_selection() counts a hybrid extruder as two tags; that still lines up because
+    // only the last extruder can be hybrid.
+    if (m_type == Preset::TYPE_PRINTER) {
+        for (int i = 0; i < extruder_nums; ++i)
+            options.push_back(translate_category(wxString::Format("Extruder %d", i + 1), m_type));
+        return options;
+    }
+
     std::string pt = m_preset_bundle->printers.get_edited_preset().get_printer_type(m_preset_bundle);
-    // Orca: the main/deputy toolhead names describe a dual-nozzle printer, where extruder 0 is the
-    // left (deputy) and extruder 1 the right (main) nozzle. From three extruders on the tools are
-    // interchangeable, so name them by index instead of repeating one side.
+    // Orca: the main/deputy toolhead names describe a Bambu dual-nozzle printer, where extruder 0 is
+    // the left (deputy) and extruder 1 the right (main) nozzle. Other printers number their tools.
+    const bool toolhead_names = extruder_nums == 2 && m_preset_bundle->is_bbl_vendor();
     for (int i = 0; i < extruder_nums; ++i) {
-        wxString extruder_name = extruder_nums > 2 ? wxString::Format("T%d", i + 1) :
+        wxString extruder_name = !toolhead_names ? wxString::Format("T%d", i + 1) :
                                                      _L(DevPrinterConfigUtil::get_toolhead_display_name(
                                                          pt, (i == 0) ? DEPUTY_EXTRUDER_ID : MAIN_EXTRUDER_ID,
                                                          ToolHeadComponent::Nozzle, ToolHeadNameCase::TitleCase, true));
@@ -8383,6 +8427,71 @@ std::vector<wxString> Tab::generate_extruder_options()
     return options;
 }
 
+Page *TabPrinter::extruder_page() const
+{
+    for (const PageShp &page : m_pages)
+        if (page->title() == "Extruder")
+            return page.get();
+    return nullptr;
+}
+
+int TabPrinter::extruder_page_data_index(const std::string &field_id) const
+{
+    if (Page *page = extruder_page())
+        for (const auto &group : page->m_optgroups)
+            if (auto it = group->opt_map().find(field_id); it != group->opt_map().end())
+                return it->second.second;
+    return -1;
+}
+
+int TabPrinter::extruder_variant_index(int extruder)
+{
+    const auto *extruders = m_config->option<ConfigOptionEnumsGeneric>("extruder_type");
+    const int   index     = extruder < int(extruders->size()) ?
+                                m_config->get_index_for_extruder(extruder + 1, "printer_extruder_id", ExtruderType(extruders->values[extruder]),
+                                                                 get_actual_nozzle_volume_type(extruder), "printer_extruder_variant") :
+                                -1;
+    return index < 0 ? extruder : index;
+}
+
+void TabPrinter::update_custom_dirty(std::vector<std::string> &dirty_options, std::vector<std::string> &nonsys_options)
+{
+    drop_unchanged_added_entries(dirty_options, *m_config, &m_presets->get_selected_preset());
+    drop_unchanged_added_entries(nonsys_options, *m_config, m_presets->get_selected_preset_parent());
+}
+
+void TabPrinter::sync_extruders_count()
+{
+    if (m_printer_technology != ptFFF)
+        return;
+    const auto *nozzle_diameter = m_config->option<ConfigOptionFloats>("nozzle_diameter");
+    if (nozzle_diameter == nullptr || nozzle_diameter->size() == m_extruders_count)
+        return;
+    extruders_count_changed(nozzle_diameter->size());
+    init_options_list();
+    update_all_extruder_variants();
+}
+
+void TabPrinter::activate_option(const std::string &opt_key, const wxString &category)
+{
+    wxString number;
+    long     n = 0;
+    const bool numbered = category.StartsWith("Extruder ", &number) && number.ToLong(&n);
+    if (extruder_page() == nullptr || (!numbered && category != "Extruder")) {
+        Tab::activate_option(opt_key, category);
+        return;
+    }
+
+    // Selecting fires the switch's event, which re-targets the page (switch_excluder()).
+    const int extruder_idx = (n >= 1 && n <= long(m_extruders_count)) ? int(n - 1) : 0;
+    if (m_extruder_switch && m_extruder_switch->IsThisEnabled() && extruder_idx != get_current_active_extruder())
+        m_extruder_switch->SetSelection(calculate_selection_index_for_extruder(extruder_idx, get_actual_nozzle_volume_type(extruder_idx)));
+
+    // The page's controls are created for index 0.
+    const auto pos = opt_key.find('#');
+    Tab::activate_option(pos == std::string::npos ? opt_key : opt_key.substr(0, pos) + "#0", "Extruder");
+}
+
 NozzleVolumeType Tab::get_actual_nozzle_volume_type(int extruder_id)
 {
     int extruder_count = m_preset_bundle->get_printer_extruder_count();
@@ -8459,18 +8568,44 @@ bool Tab::get_extruder_sync_enable_state(int extruder_id)
     return false;
 }
 
+bool Tab::variant_switch_active() const
+{
+    if (m_extruder_switch)
+        return m_extruder_switch->IsThisEnabled();
+    return m_variant_combo && m_variant_combo->IsThisEnabled();
+}
+
+void Tab::update_variant_sizer_visibility()
+{
+    if (!m_variant_sizer)
+        return;
+    const bool show = variant_switch_active() && m_active_page && !m_active_page->m_opt_id_map.empty();
+    m_main_sizer->Show(m_variant_sizer, show);
+    if (m_extruder_sync) {
+        m_extruder_sync->Show(show);
+        // Orca: copying between extruders is offered only between nozzle variants, and not on the Extruder page.
+        m_extruder_sync->Enable(m_extruder_switch_variants && !is_printer_extruder_page(m_active_page) &&
+                                get_extruder_sync_enable_state(get_current_active_extruder()));
+    }
+    GetParent()->Layout();
+}
+
 void Tab::switch_excluder(int extruder_id, bool reload)
 {
     Preset & printer_preset = m_preset_bundle->printers.get_edited_preset();
     auto nozzle_volumes = m_preset_bundle->project_config.option<ConfigOptionEnumsGeneric>("nozzle_volume_type");
     auto extruders      = printer_preset.config.option<ConfigOptionEnumsGeneric>("extruder_type");
 
+    // Orca: the printer tab re-targets its pages to the extruder selected on the switch. Resolved before
+    // the range check below, which keeps the extruder_type read in get_index_for_extruder in range.
+    if (m_type == Preset::TYPE_PRINTER && extruder_id == -1)
+        extruder_id = get_current_active_extruder();
     if (!m_variant_combo && (extruder_id >= (int)nozzle_volumes->size() || extruder_id >= (int)extruders->size()))
         extruder_id = 0;
     if (m_extruder_switch) {
         int current_extruder = get_current_active_extruder();
         bool sync_enable = get_extruder_sync_enable_state(current_extruder);
-        m_extruder_sync->Enable(m_extruder_switch->IsThisEnabled() && sync_enable);
+        m_extruder_sync->Enable(m_extruder_switch_variants && sync_enable && !is_printer_extruder_page(m_active_page));
         m_extruder_sync->Show();
         if (m_type != Preset::TYPE_PRINTER) {
             if (extruder_id == -1)
@@ -8497,24 +8632,26 @@ void Tab::switch_excluder(int extruder_id, bool reload)
         return;
     if (m_extruder_switch) m_extruder_switch->SetClientData(reinterpret_cast<void*>(static_cast<std::uintptr_t>(index)));
     if (m_variant_combo) m_variant_combo->SetClientData(reinterpret_cast<void *>(static_cast<std::uintptr_t>(index)));
-    wxWindow *variant_ctrl = m_extruder_switch ? (wxWindow *) m_extruder_switch : m_variant_combo;
     for (auto page : m_pages) {
         bool is_extruder = false;
+        int  page_index  = index;
         if (m_type == Preset::TYPE_PRINTER) {
-            if (page->title().StartsWith("Extruder")) {
-                int extruder_id2 = std::atoi(page->title().Mid(9).ToUTF8()) - 1;
-                if (extruder_id >= 0 && extruder_id2 != extruder_id)
-                    continue;
-                if (extruder_id2 > 0)
-                    index = get_index_for_extruder(extruder_id2);
+            if (page->title() == "Extruder")
                 is_extruder = true;
-            } else if (page->title().StartsWith("Motion ability")) {
-                index = get_index_for_extruder(extruder_id == -1 ? 0 : extruder_id, 2);
-            }
+            else if (page->title().StartsWith("Motion ability"))
+                page_index = get_index_for_extruder(extruder_id == -1 ? 0 : extruder_id, 2);
         }
         page->m_opt_id_map.clear();
         for (auto group : page->m_optgroups) {
             for (auto &opt : group->opt_map()) {
+                if (is_extruder && opt.second.second >= 0) {
+                    // Per-variant options use the variant column, the others (nozzle_diameter,
+                    // extruder_offset, ...) are sized by the extruder count and use the extruder.
+                    const int idx = printer_options_with_variant_1.count(opt.second.first) > 0 ? page_index : extruder_id;
+                    const_cast<int &>(opt.second.second) = idx;
+                    page->m_opt_id_map.insert({opt.second.first + "#" + std::to_string(idx), opt.first});
+                    continue;
+                }
                 auto iter = std::find(printer_extruder_options.begin(), printer_extruder_options.end(), opt.second.first);
                 if (iter != printer_extruder_options.end()) {
                     page->m_opt_id_map.insert({opt.first, opt.first});
@@ -8522,9 +8659,9 @@ void Tab::switch_excluder(int extruder_id, bool reload)
                 }
 
                 if (opt.second.second >= 0) {
-                    const_cast<int &>(opt.second.second) = index;
-                    page->m_opt_id_map.insert({opt.second.first + "#" + std::to_string(index), opt.first});
-                    group->draw_multi_extruder = !is_extruder && variant_ctrl->IsThisEnabled();
+                    const_cast<int &>(opt.second.second) = page_index;
+                    page->m_opt_id_map.insert({opt.second.first + "#" + std::to_string(page_index), opt.first});
+                    group->draw_multi_extruder = variant_switch_active();
                 }
             }
         }

src/slic3r/GUI/Tab.hpp

@@ -331,6 +331,10 @@ public:
     MultiSwitchButton *  m_variant_combo   = nullptr;
     ScalableButton *m_extruder_sync   = nullptr;
 	wxPanel *       m_extruder_sync_box  = nullptr;
+    // Orca: whether m_extruder_switch switches nozzle variants (it then offers sync between them).
+    // The printer tab also enables the switch for printers without variants, to choose the extruder
+    // its Extruder and Motion ability pages edit.
+    bool            m_extruder_switch_variants = false;
     std::vector<NozzleVolumeType> m_actual_nozzle_volumes;
 
 public:
@@ -387,6 +391,13 @@ public:
     void        update_changed_tree_ui();
 	void		update_undo_buttons();
     void        update_extruder_switch_colors();
+    // Whether the variant switch (m_extruder_switch / m_variant_combo) is enabled: on the printer tab for
+    // any multi-extruder printer, on the other tabs when it switches nozzle variants.
+    bool        variant_switch_active() const;
+    // Orca: whether `page` is the printer tab's single "Extruder" page, which edits the extruder selected on the switch.
+    bool        is_printer_extruder_page(const Page* page) const { return m_type == Preset::TYPE_PRINTER && page && page->title() == "Extruder"; }
+    // Shows the variant switch row on pages with options that follow it.
+    void        update_variant_sizer_visibility();
     void        update_all_extruder_options_status();
     void        check_extruder_options_status(int index, bool &sys_extruder, bool &modified_extruder, const std::vector<PageShp>& pages_to_check);
 
@@ -444,7 +455,7 @@ public:
 	virtual void    on_value_change(const std::string& opt_key, const boost::any& value);
 
     void            update_wiping_button_visibility();
-	void			activate_option(const std::string& opt_key, const wxString& category);
+	virtual void	activate_option(const std::string& opt_key, const wxString& category);
     void			apply_searcher();
 	void			cache_config_diff(const std::vector<std::string>& selected_options, const DynamicPrintConfig* config = nullptr);
 	void			apply_config_from_cache();
@@ -710,6 +721,25 @@ public:
 	void		cache_extruder_cnt(const DynamicPrintConfig* config = nullptr);
 	bool		apply_extruder_cnt_from_cache();
 	void		refresh_printer_agent_dropdown() const;
+
+	// Orca: a single "Extruder" page for all extruders. Its controls are created once (index 0) and
+	// switch_excluder() re-targets them to the extruder selected on m_extruder_switch.
+	Page*		extruder_page() const;
+	// Config index an "Extruder" page field (e.g. "retraction_length#0") currently edits, -1 if not on that page.
+	int			extruder_page_data_index(const std::string& field_id) const;
+	// Config index of an extruder's per-variant options (Retraction, Z-Hop, ...): its variant column
+	// for the nozzle selected on the switch, or the extruder index on a printer without variants.
+	int			extruder_variant_index(int extruder);
+	// After the config was restored (roll back): follow its extruder count, if it differs.
+	void		sync_extruders_count();
+	// Search jump to "Extruder N" / "key#N": selects extruder N on the switch, then activates the
+	// page's own field on the "Extruder" page.
+	void		activate_option(const std::string& opt_key, const wxString& category) override;
+
+protected:
+	// Orca: values of extruders added by raising the extruder count have no saved / system value to
+	// revert to; the change is shown on "extruders_count", not on each of their parameters.
+	void		update_custom_dirty(std::vector<std::string> &dirty_options, std::vector<std::string> &nonsys_options) override;
 };
 
 class TabSLAMaterial : public Tab

src/slic3r/GUI/Widgets/AMSControl.cpp

@@ -244,7 +244,7 @@ AMSControl::AMSControl(wxWindow *parent, wxWindowID id, const wxPoint &pos, cons
     m_sizer_ams_body->Add(m_sizer_ams_area_right, wxALIGN_CENTER, 0);
 
     m_sizer_body->Add(m_sizer_ams_items, 0, wxALIGN_CENTER, 0);
-    m_sizer_body->Add(0, 0, 1, wxEXPAND | wxTOP, FromDIP(10));
+    m_sizer_ams_gap = m_sizer_body->Add(0, 0, 1, wxEXPAND | wxTOP, FromDIP(10));
     m_sizer_body->Add(m_sizer_ams_body, 0, wxALIGN_CENTER, 0);
     m_sizer_body->Add(m_sizer_down_road, 0, wxALIGN_CENTER, 0);
     m_sizer_body->Add(m_sizer_ams_option, 0, wxEXPAND, 0);
@@ -371,7 +371,7 @@ bool AMSControl::IsAmsInRightPanel(std::string ams_id) {
             return false;
         }
     }
-    else{
+    else if (m_total_ext_count == 1){
         for (auto id : m_item_ids[MAIN_EXTRUDER_ID]){
             if (id == ams_id){
                 return true;
@@ -379,6 +379,10 @@ bool AMSControl::IsAmsInRightPanel(std::string ams_id) {
         }
         return false;
     }
+    else {
+        // Generic N Nozzles
+    }
+    return false;
 }
 
 void AMSControl::AmsSelectedSwitch(wxCommandEvent& event) {
@@ -519,7 +523,7 @@ void AMSControl::msw_rescale()
     m_button_ams_setting_press.msw_rescale();
     m_button_ams_setting->SetBitmap(m_button_ams_setting_normal.bmp());
 
-    m_extruder->msw_rescale();
+    if (m_extruder) m_extruder->msw_rescale();
 
     if (m_button_extruder_feed) m_button_extruder_feed->Rescale(); // ORCA
     if (m_button_extruder_back) m_button_extruder_back->Rescale(); // ORCA
@@ -603,6 +607,8 @@ void AMSControl::CreateAms()
 
 
 void AMSControl::ClearAms() {
+    m_sizer_ams_items->Clear(false);
+
     m_simplebook_ams_right->DeleteAllPages();
     m_simplebook_ams_left->DeleteAllPages();
     m_simplebook_ams_right->DestroyChildren();
@@ -613,7 +619,7 @@ void AMSControl::ClearAms() {
     m_simplebook_ams_left->Refresh();
 
     for (auto it : m_ams_preview_list) {
-        delete it.second;
+        if (it.second) it.second->Destroy();
     }
     m_ams_preview_list.clear();
     m_ext_image_list.clear();
@@ -624,12 +630,167 @@ void AMSControl::ClearAms() {
     m_ams_item_list.clear();
     m_sizer_prv_right->Clear();
     m_sizer_prv_left->Clear();
-    m_item_ids = { {}, {} };
+
+    if (m_nozzle_book) {
+        m_nozzle_book->Destroy();
+        m_nozzle_book = nullptr;
+    } else {
+        for (auto &pane : m_nozzle_panes) {
+            if (pane.preview_panel) pane.preview_panel->Destroy();
+            if (pane.ams_book) pane.ams_book->Destroy();
+        }
+    }
+    m_item_ids.assign(std::max(m_total_ext_count, 2), {});
+    m_nozzle_panes.clear();
+    m_active_nozzle_id = 0;
+    m_current_ams.clear();
+    m_current_show_ams_left.clear();
+    m_current_show_ams_right.clear();
     pair_id.clear();
 }
 
+void AMSControl::restore_legacy_ams_layout()
+{
+    m_sizer_ams_items->Clear(false);
+    m_sizer_ams_items->SetOrientation(wxHORIZONTAL);
+    m_sizer_body->GetItem(m_sizer_ams_items)->SetFlag(wxALIGN_CENTER);
+    m_sizer_ams_items->Add(m_panel_prv_left, 0, wxLEFT | wxRIGHT, FromDIP(5));
+    m_sizer_ams_items->Add(m_panel_prv_right, 0, wxLEFT | wxRIGHT, FromDIP(5));
+
+    m_panel_prv_left->Show();
+    m_panel_prv_right->Show();
+    m_simplebook_ams_left->Show();
+    m_simplebook_ams_right->Show();
+    m_panel_down_road->Show();
+    m_sizer_body->Show(m_sizer_ams_body, true);
+    m_sizer_option_mid->Show(m_extruder, true);
+    m_down_road->SetSingleSideLayout(false);
+    m_sizer_ams_gap->SetProportion(1);
+    m_sizer_ams_gap->SetBorder(FromDIP(10));
+    m_down_road->SetNozzleCount(m_total_ext_count);
+}
+
+void AMSControl::CreateAmsMultiNozzle(const std::string &series_name, const std::string &printer_type) {
+    const size_t pane_count = static_cast<size_t>(std::max(m_total_ext_count, 0));
+    m_nozzle_panes.resize(pane_count);
+    m_active_nozzle_id = 0;
+
+    m_sizer_ams_items->Clear(false);
+    m_sizer_ams_items->SetOrientation(wxVERTICAL);
+    m_sizer_body->GetItem(m_sizer_ams_items)->SetFlag(wxALIGN_CENTER);
+    m_sizer_body->Show(m_sizer_ams_body, false);
+    m_sizer_ams_gap->SetProportion(0);
+    m_sizer_ams_gap->SetBorder(0);
+
+    m_panel_prv_left->Hide();
+    m_panel_prv_right->Hide();
+    m_simplebook_ams_left->Hide();
+    m_simplebook_ams_right->Hide();
+    m_panel_down_road->Show();
+    m_sizer_option_mid->Show(m_extruder, true);
+    m_switcher->Hide();
+    m_down_road->SetNozzleCount(1);
+    m_down_road->SetSingleSideLayout(true, AMSPanelPos::LEFT_PANEL);
+    m_down_road->UpdateLeft(1, AMSRoadShowMode::AMS_ROAD_MODE_SINGLE);
+    m_down_road->UpdateRight(1, AMSRoadShowMode::AMS_ROAD_MODE_NONE);
+    m_extruder->updateNozzleNum(1, series_name);
+
+    m_nozzle_book = new wxSimplebook(m_amswin, wxID_ANY, wxDefaultPosition, wxDefaultSize, 0);
+    m_nozzle_book->SetMinSize(wxSize(FromDIP(264), -1));
+    m_nozzle_book->SetBackgroundColour(StateColor::darkModeColorFor(AMS_CONTROL_DEF_BLOCK_BK_COLOUR));
+    m_sizer_ams_items->Add(m_nozzle_book, 0, wxALIGN_CENTER);
+
+    for (size_t nozzle_id = 0; nozzle_id < pane_count; ++nozzle_id) {
+        auto &pane = m_nozzle_panes[nozzle_id];
+        // A generic page is one H2C side. Keep the left-side geometry as the
+        // canonical single-nozzle presentation; the road and AMS item code
+        // still use the same side-specific paths as the legacy layout.
+        pane.panel_pos = AMSPanelPos::LEFT_PANEL;
+        pane.page = new wxPanel(m_nozzle_book, wxID_ANY);
+        pane.page->SetMinSize(wxSize(FromDIP(264), -1));
+        pane.page->SetBackgroundColour(StateColor::darkModeColorFor(AMS_CONTROL_DEF_BLOCK_BK_COLOUR));
+        pane.page_sizer = new wxBoxSizer(wxVERTICAL);
+        pane.page->SetSizer(pane.page_sizer);
+
+        pane.preview_panel = new wxScrolledWindow(pane.page, wxID_ANY);
+        pane.preview_panel->SetScrollRate(10, 0);
+        pane.preview_panel->SetSize(AMS_ITEMS_PANEL_SIZE);
+        pane.preview_panel->SetMinSize(AMS_ITEMS_PANEL_SIZE);
+        pane.preview_panel->SetBackgroundColour(StateColor::darkModeColorFor(AMS_CONTROL_DEF_BLOCK_BK_COLOUR));
+
+        pane.preview_sizer = new wxBoxSizer(wxHORIZONTAL);
+        pane.preview_panel->SetSizer(pane.preview_sizer);
+
+        // Generic lane cards grow to their calculated width for 1-8 lanes. Keep the
+        // book at the legacy minimum, but allow the page to expand to that width.
+        pane.ams_book = new wxSimplebook(pane.page, wxID_ANY, wxDefaultPosition, wxDefaultSize, 0);
+        pane.ams_book->SetMinSize(wxSize(FromDIP(264), -1));
+        pane.ams_book->SetBackgroundColour(StateColor::darkModeColorFor(AMS_CONTROL_DEF_BLOCK_BK_COLOUR));
+        pane.ams_area = new wxBoxSizer(wxHORIZONTAL);
+        pane.ams_area->Add(pane.ams_book, 0, wxALIGN_CENTER, 0);
+
+        pane.page_sizer->Add(pane.preview_panel, 0, wxALIGN_CENTER | wxTOP, FromDIP(5));
+        pane.page_sizer->Add(pane.ams_area, 0, wxALIGN_CENTER | wxTOP, FromDIP(10));
+
+        m_nozzle_book->AddPage(pane.page, wxEmptyString, nozzle_id == 0);
+    }
+
+    auto add_info = [this, series_name, printer_type, pane_count](AMSinfo info) {
+        if (pane_count == 0) return;
+
+        info.nozzle_id = std::clamp(info.nozzle_id, 0, static_cast<int>(pane_count) - 1);
+        AddAmsPreview(info, info.ams_type);
+        if (info.ams_type == AMSModel::EXT_AMS && info.cans.size() == 1)
+            AddAms({info}, series_name, printer_type, m_nozzle_panes[info.nozzle_id].panel_pos);
+        else
+            AddAms(info);
+    };
+
+    for (const auto &info : m_ams_info)
+        add_info(info);
+
+    for (auto &info : m_ext_info) {
+        const int virtual_tray_id = std::atoi(info.ams_id.c_str());
+        if (virtual_tray_id <= VIRTUAL_TRAY_MAIN_ID &&
+            virtual_tray_id >= VIRTUAL_TRAY_MAIN_ID - static_cast<int>(pane_count) + 1)
+            info.nozzle_id = VIRTUAL_TRAY_MAIN_ID - virtual_tray_id;
+        add_info(info);
+    }
+
+    for (auto &pane : m_nozzle_panes) {
+        if (pane.ams_book && pane.ams_book->GetPageCount() > 0)
+            pane.ams_book->SetSelection(0);
+        if (pane.preview_sizer) pane.preview_sizer->Layout();
+        if (pane.preview_panel) pane.preview_panel->FitInside();
+        if (pane.ams_book) pane.ams_book->Layout();
+        if (pane.page) pane.page->Layout();
+
+        if (!pane.current_ams.empty()) {
+            auto preview = m_ams_preview_list.find(pane.current_ams);
+            if (preview != m_ams_preview_list.end() && preview->second)
+                preview->second->OnSelected();
+        }
+    }
+
+    if (m_nozzle_book && pane_count > 0) {
+        m_nozzle_book->SetSelection(0);
+        m_current_ams = m_nozzle_panes[0].current_ams;
+        if (!m_current_ams.empty())
+            SwitchAms(m_current_ams);
+        else {
+            m_down_road->UpdateLeft(1, AMSRoadShowMode::AMS_ROAD_MODE_NONE);
+            m_down_road->UpdateRight(1, AMSRoadShowMode::AMS_ROAD_MODE_NONE);
+        }
+    }
+    m_amswin->Layout();
+    m_amswin->Fit();
+    // Generic N Nozzles
+}
+
 void AMSControl::CreateAmsDoubleNozzle(const std::string &series_name, const std::string &printer_type)
 {
+    restore_legacy_ams_layout();
+
     std::vector<AMSinfo> single_info_left;
     std::vector<AMSinfo> single_info_right;
 
@@ -751,6 +912,8 @@ void AMSControl::CreateAmsDoubleNozzle(const std::string &series_name, const std
 
 void AMSControl::CreateAmsSingleNozzle(const std::string &series_name, const std::string &printer_type)
 {
+    restore_legacy_ams_layout();
+
     std::vector<int>m_item_nums{0,0};
     std::vector<AMSinfo> single_info;
 
@@ -979,6 +1142,17 @@ void AMSControl::UpdateAms(const std::string   &series_name,
                 if (m_ams_info[i].routes_to_main_extruder() != ams_info[i].routes_to_main_extruder()) {
                     fresh = true;
                 }
+                if (m_ams_info[i].nozzle_id != ams_info[i].nozzle_id) {
+                    fresh = true;
+                }
+            }
+
+            for (int i = 0; i < static_cast<int>(m_ext_info.size()); ++i) {
+                if (m_ext_info[i].ams_id != ext_info[i].ams_id ||
+                    m_ext_info[i].nozzle_id != ext_info[i].nozzle_id ||
+                    m_ext_info[i].ext_type != ext_info[i].ext_type) {
+                    fresh = true;
+                }
             }
         }
         else{
@@ -993,11 +1167,19 @@ void AMSControl::UpdateAms(const std::string   &series_name,
         m_dev_id = dev_id;
         if (fresh){
             ClearAms();
-            if (m_total_ext_count >= 2){
-                CreateAmsDoubleNozzle(series_name, printer_type);
-            }else{
-                CreateAmsSingleNozzle(series_name, printer_type);
+            // Keep the established Bambu left/right AMS presentation. Generic N-nozzle
+            // tabs are for non-Bambu printers; the current checkout exposes this behavior
+            // through PresetBundle::is_bbl_vendor().
+            const bool is_bbl_behavior = wxGetApp().preset_bundle && wxGetApp().preset_bundle->is_bbl_vendor();
+            if (is_bbl_behavior) {
+                if (m_total_ext_count == 1)
+                    CreateAmsSingleNozzle(series_name, printer_type);
+                else if (m_total_ext_count == 2)
+                    CreateAmsDoubleNozzle(series_name, printer_type);
             }
+            else
+                CreateAmsMultiNozzle(series_name, printer_type);
+
             SetSize(wxSize(FromDIP(578), -1));
             SetMinSize(wxSize(FromDIP(578), -1));
             Layout();
@@ -1070,7 +1252,7 @@ void AMSControl::UpdateAms(const std::string   &series_name,
     }
 
     /*update ams extruder*/
-    if (m_extruder->updateNozzleNum(m_total_ext_count, series_name))
+    if (m_total_ext_count <= 2 && m_extruder->updateNozzleNum(m_total_ext_count, series_name))
     {
         m_amswin->Layout();
     }
@@ -1106,7 +1288,13 @@ void AMSControl::AddAmsPreview(AMSinfo info, AMSModel type)
 {
     AMSPreview *ams_prv = nullptr;
 
-    if (info.routes_to_main_extruder())
+    if (m_total_ext_count > 2) {
+        const int nozzle_id = std::clamp(info.nozzle_id, 0, m_total_ext_count - 1);
+        auto &pane = m_nozzle_panes[nozzle_id];
+        ams_prv = new AMSPreview(pane.preview_panel, wxID_ANY, info, type);
+        pane.preview_sizer->Add(ams_prv, 0, wxALIGN_CENTER | wxLEFT, FromDIP(6));
+    }
+    else if (info.routes_to_main_extruder())
     {
         ams_prv = new AMSPreview(m_panel_prv_right, wxID_ANY, info, type);
         m_sizer_prv_right->Add(ams_prv, 0, wxALIGN_CENTER | wxLEFT, FromDIP(6));
@@ -1129,6 +1317,40 @@ void AMSControl::AddAmsPreview(AMSinfo info, AMSModel type)
 void AMSControl::createAms(wxSimplebook* parent, int& idx, AMSinfo info, AMSPanelPos pos) {
     auto ams_item = new AmsItem(parent, info, info.ams_type, pos);
     parent->InsertPage(idx, ams_item, wxEmptyString, true);
+
+    // Generic AMS cards may be wider than the legacy 264 DIP page. Propagate
+    // that calculated width through the page and simplebook so 5-8 lanes are
+    // laid out fully instead of being clipped by the old minimum width.
+    if (info.ams_type == AMSModel::GENERIC_AMS) {
+        const int required_width = ams_item->GetMinSize().x;
+        if (required_width > 0) {
+            const int page_width = std::max(parent->GetMinSize().x, required_width);
+            parent->SetMinSize(wxSize(page_width, -1));
+            if (auto *page = parent->GetParent()) {
+                page->SetMinSize(wxSize(std::max(page->GetMinSize().x, page_width), -1));
+                if (auto *nozzle_book = page->GetParent())
+                    nozzle_book->SetMinSize(wxSize(std::max(nozzle_book->GetMinSize().x, page_width), -1));
+            }
+        }
+        // Above eight lanes, AmsItem is a fixed-minimum viewport over a wider
+        // lane strip. Expand the viewport through its page's sizers rather
+        // than propagating the strip's virtual width into the card/book.
+        const bool generic_lane_layout = !wxGetApp().preset_bundle || !wxGetApp().preset_bundle->is_bbl_vendor();
+        if (generic_lane_layout && info.cans.size() > 8) {
+            if (auto *page = parent->GetParent()) {
+                auto pane = std::find_if(m_nozzle_panes.begin(), m_nozzle_panes.end(),
+                    [page](const NozzleAmsPane &candidate) { return candidate.page == page; });
+                if (pane != m_nozzle_panes.end()) {
+                    pane->ams_area->GetItem(pane->ams_book)->SetProportion(1);
+                    pane->ams_area->GetItem(pane->ams_book)->SetFlag(wxEXPAND);
+                    pane->page_sizer->GetItem(pane->ams_area)->SetFlag(wxEXPAND | wxTOP);
+                    m_sizer_ams_items->GetItem(m_nozzle_book)->SetFlag(wxEXPAND);
+                    m_sizer_body->GetItem(m_sizer_ams_items)->SetFlag(wxEXPAND);
+                    m_amswin->Layout();
+                }
+            }
+        }
+    }
     ams_item->set_selection(idx);
     idx++;
 
@@ -1153,7 +1375,10 @@ AMSRoadShowMode AMSControl::findFirstMode(AMSPanelPos pos) {
         if (item->second->get_ams_model() == AMSModel::EXT_AMS && item->second->get_ext_type() == AMSModelOriginType::LITE_EXT) return AMSRoadShowMode::AMS_ROAD_MODE_AMS_LITE;
         return AMSRoadShowMode::AMS_ROAD_MODE_FOUR;
     }
-    else{
+    else if (item->second->get_can_count() > GENERIC_AMS_SLOT_NUM) {
+        return AMSRoadShowMode::AMS_ROAD_MODE_GENERIC;
+    }
+    else {
         for (auto ids : pair_id){
             if (ids.first == ams_id || ids.second == ams_id){
                 return AMSRoadShowMode::AMS_ROAD_MODE_DOUBLE;
@@ -1200,6 +1425,11 @@ void AMSControl::createAmsPanel(wxSimplebook *parent, int &idx, std::vector<AMSi
                 //book_sizer->Add(ams1, 0, wxALIGN_CENTER_HORIZONTAL, 0);
                 book_sizer->Add(ams1, 0, wxLEFT, (book_panel->GetSize().x - ams1->GetSize().x) / 2);
             }
+            else if (pos == AMSPanelPos::SINGLE_PANEL) {
+                book_sizer->AddStretchSpacer(1);
+                book_sizer->Add(ams1, 0, wxALIGN_CENTER_VERTICAL, 0);
+                book_sizer->AddStretchSpacer(1);
+            }
             else{
                 auto ext_image = new AMSExtImage(book_panel, pos, m_total_ext_count, false);
                 book_sizer->Add(ams1, 0, wxLEFT, FromDIP(30));
@@ -1228,7 +1458,17 @@ void AMSControl::createAmsPanel(wxSimplebook *parent, int &idx, std::vector<AMSi
 
 void AMSControl::AddAms(AMSinfo info, AMSPanelPos pos)
 {
-    if (m_total_ext_count > 1){
+    if (m_total_ext_count > 2) {
+        const int nozzle_id = std::clamp(info.nozzle_id, 0, m_total_ext_count - 1);
+        auto &pane = m_nozzle_panes[nozzle_id];
+        pane.item_ids.push_back(info.ams_id);
+        m_item_ids[nozzle_id].push_back(info.ams_id);
+        if (pane.current_ams.empty()) pane.current_ams = info.ams_id;
+        createAms(pane.ams_book, pane.page_index, info, AMSPanelPos::SINGLE_PANEL);
+        pane.ams_book->Fit();
+        pane.ams_book->Layout();
+    }
+    else if (m_total_ext_count == 2){
         if (info.routes_to_main_extruder()){
             createAms(m_simplebook_ams_right, m_right_page_index, info, AMSPanelPos::RIGHT_PANEL);
         }
@@ -1239,6 +1479,9 @@ void AMSControl::AddAms(AMSinfo info, AMSPanelPos pos)
     else if (m_total_ext_count == 1){
         createAms(m_simplebook_ams_left, m_left_page_index, info, AMSPanelPos::LEFT_PANEL);
     }
+    else {
+        // Generic N Nozzles
+    }
     m_simplebook_ams_left->Layout();
     m_simplebook_ams_right->Layout();
     m_simplebook_ams_left->Refresh();
@@ -1269,7 +1512,19 @@ void AMSControl::AddAms(std::vector<AMSinfo> single_info, const std::string &ser
      if (single_info.size() <= 0){
         return;
     }
-    if (m_total_ext_count == 2) {
+    if (m_total_ext_count > 2) {
+        const int nozzle_id = std::clamp(single_info.front().nozzle_id, 0, m_total_ext_count - 1);
+        auto &pane = m_nozzle_panes[nozzle_id];
+        for (const auto &info : single_info) {
+            pane.item_ids.push_back(info.ams_id);
+            m_item_ids[nozzle_id].push_back(info.ams_id);
+        }
+        if (pane.current_ams.empty()) pane.current_ams = single_info.front().ams_id;
+        createAmsPanel(pane.ams_book, pane.page_index, single_info, series_name, printer_type, AMSPanelPos::SINGLE_PANEL, m_total_ext_count);
+        pane.ams_book->Fit();
+        pane.ams_book->Layout();
+    }
+    else if (m_total_ext_count == 2) {
         if (single_info[0].routes_to_main_extruder()) {
             createAmsPanel(m_simplebook_ams_right, m_right_page_index, single_info, series_name, printer_type, AMSPanelPos::RIGHT_PANEL, m_total_ext_count);
         }
@@ -1285,6 +1540,9 @@ void AMSControl::AddAms(std::vector<AMSinfo> single_info, const std::string &ser
             createAmsPanel(m_simplebook_ams_left, m_left_page_index, single_info, series_name, printer_type, AMSPanelPos::LEFT_PANEL, m_total_ext_count);
         }
     }
+    else {
+        // Generic N Nozzles
+    }
 
     m_simplebook_ams_left->Layout();
     m_simplebook_ams_right->Layout();
@@ -1322,6 +1580,21 @@ void AMSControl::AddAms(std::vector<AMSinfo> single_info, const std::string &ser
 void AMSControl::AddAmsPreview(std::vector<AMSinfo>single_info, AMSPanelPos pos) {
     if (single_info.size() <= 0) return;
 
+    if (m_total_ext_count > 2) {
+        const int nozzle_id = std::clamp(single_info.front().nozzle_id, 0, m_total_ext_count - 1);
+        auto &pane = m_nozzle_panes[nozzle_id];
+        for (const auto &info : single_info) {
+            auto *ams_prv = new AMSPreview(pane.preview_panel, wxID_ANY, info, info.ams_type);
+            pane.preview_sizer->Add(ams_prv, 0, wxALIGN_CENTER | wxLEFT, FromDIP(6));
+            ams_prv->Bind(wxEVT_LEFT_DOWN, [this, ams_prv](wxMouseEvent &e) {
+                SwitchAms(ams_prv->get_ams_id());
+                e.Skip();
+            });
+            m_ams_preview_list[info.ams_id] = ams_prv;
+        }
+        return;
+    }
+
     AMSPreview* ams_prv = nullptr;
     AMSPreview* ams_prv2 = nullptr;
     if (pos == AMSPanelPos::RIGHT_PANEL){
@@ -1360,8 +1633,97 @@ void AMSControl::AddAmsPreview(std::vector<AMSinfo>single_info, AMSPanelPos pos)
     }
 }
 
+void AMSControl::SelectNozzle(int nozzle_id)
+{
+    if (nozzle_id < 0 || nozzle_id >= static_cast<int>(m_nozzle_panes.size()))
+        return;
+
+    if (m_active_nozzle_id == nozzle_id &&
+        (!m_nozzle_book || m_nozzle_book->GetSelection() == nozzle_id))
+        return;
+
+    m_active_nozzle_id = nozzle_id;
+    if (m_nozzle_book && m_nozzle_book->GetSelection() != nozzle_id)
+        m_nozzle_book->SetSelection(nozzle_id);
+    m_current_ams = m_nozzle_panes[nozzle_id].current_ams;
+    if (!m_current_ams.empty()) {
+        SwitchAms(m_current_ams);
+        return;
+    }
+    if (m_down_road) {
+        m_down_road->UpdateLeft(1, AMSRoadShowMode::AMS_ROAD_MODE_NONE);
+        m_down_road->UpdateRight(1, AMSRoadShowMode::AMS_ROAD_MODE_NONE);
+    }
+    if (m_extruder)
+        m_extruder->OnAmsLoading(false, 0);
+    post_event(SimpleEvent(EVT_AMS_SWITCH));
+}
+
 void AMSControl::SwitchAms(std::string ams_id)
 {
+    if (m_total_ext_count > 2) {
+        NozzleAmsPane *pane = nullptr;
+        int nozzle_id = -1;
+        for (int index = 0; index < static_cast<int>(m_nozzle_panes.size()); ++index) {
+            auto &candidate = m_nozzle_panes[index];
+            if (std::find(candidate.item_ids.begin(), candidate.item_ids.end(), ams_id) != candidate.item_ids.end()) {
+                pane = &candidate;
+                nozzle_id = index;
+                break;
+            }
+        }
+        if (!pane) return;
+
+        m_active_nozzle_id = nozzle_id;
+        if (m_nozzle_book && m_nozzle_book->GetSelection() != nozzle_id)
+            m_nozzle_book->SetSelection(nozzle_id);
+
+        pane->current_ams = ams_id;
+        m_current_ams = ams_id;
+        m_current_select = ams_id;
+
+        for (const auto &id : pane->item_ids) {
+            auto preview = m_ams_preview_list.find(id);
+            if (preview == m_ams_preview_list.end() || !preview->second) continue;
+            if (id == ams_id) preview->second->OnSelected();
+            else preview->second->UnSelected();
+        }
+
+        auto item = m_ams_item_list.find(ams_id);
+        if (item != m_ams_item_list.end() && item->second) {
+            if (pane->ams_book)
+                pane->ams_book->SetSelection(item->second->get_selection());
+
+            AMSRoadShowMode road_mode = AMSRoadShowMode::AMS_ROAD_MODE_SINGLE;
+            if (item->second->get_can_count() == GENERIC_AMS_SLOT_NUM)
+                road_mode = AMSRoadShowMode::AMS_ROAD_MODE_FOUR;
+            else if (item->second->get_can_count() > GENERIC_AMS_SLOT_NUM)
+                road_mode = AMSRoadShowMode::AMS_ROAD_MODE_GENERIC;
+            else if (item->second->get_ams_model() == AMSModel::N3S_AMS)
+                road_mode = AMSRoadShowMode::AMS_ROAD_MODE_SINGLE_N3S;
+            else if (item->second->get_ams_model() == AMSModel::AMS_LITE ||
+                     (item->second->get_ams_model() == AMSModel::EXT_AMS &&
+                      item->second->get_ext_type() == AMSModelOriginType::LITE_EXT))
+                road_mode = AMSRoadShowMode::AMS_ROAD_MODE_AMS_LITE;
+
+            if (m_down_road) {
+                if (pane->panel_pos == AMSPanelPos::LEFT_PANEL) {
+                    m_down_road->UpdateLeft(1, road_mode);
+                    m_down_road->UpdateRight(1, AMSRoadShowMode::AMS_ROAD_MODE_NONE);
+                } else {
+                    m_down_road->UpdateLeft(1, AMSRoadShowMode::AMS_ROAD_MODE_NONE);
+                    m_down_road->UpdateRight(1, road_mode);
+                }
+                m_down_road->UpdatePassRoad(pane->panel_pos, -1, AMSPassRoadSTEP::AMS_ROAD_STEP_NONE);
+            }
+            if (m_extruder)
+                m_extruder->OnAmsLoading(false, 0);
+        }
+
+        post_event(SimpleEvent(EVT_AMS_SWITCH));
+        return;
+    }
+
     if(ams_id == m_current_show_ams_left || ams_id == m_current_show_ams_right){return;}
 
     bool is_in_right = IsAmsInRightPanel(ams_id);
@@ -1432,13 +1794,17 @@ void AMSControl::SwitchAms(std::string ams_id)
                     else {
                         AMSRoadShowMode mode = AMSRoadShowMode::AMS_ROAD_MODE_SINGLE;
 
-                        if (item->get_ams_model() == AMSModel::N3S_AMS)
+                        if (item->get_can_count() > GENERIC_AMS_SLOT_NUM)
+                            mode = AMSRoadShowMode::AMS_ROAD_MODE_GENERIC;
+                        else if (item->get_ams_model() == AMSModel::N3S_AMS)
                             mode = AMSRoadShowMode::AMS_ROAD_MODE_SINGLE_N3S;
 
-                        for (auto it : pair_id) {
-                            if (it.first == ams_id || it.second == ams_id) {
-                                mode = AMSRoadShowMode::AMS_ROAD_MODE_DOUBLE;
-                                break;
+                        if (item->get_can_count() <= GENERIC_AMS_SLOT_NUM) {
+                            for (auto it : pair_id) {
+                                if (it.first == ams_id || it.second == ams_id) {
+                                    mode = AMSRoadShowMode::AMS_ROAD_MODE_DOUBLE;
+                                    break;
+                                }
                             }
                         }
                         pos == AMSPanelPos::LEFT_PANEL ? m_down_road->UpdateLeft(m_total_ext_count, mode)
@@ -1500,6 +1866,20 @@ void AMSControl::SetExtruder(bool on_off, int nozzle_id, std::string ams_id, std
     AmsItem *item = nullptr;
     if (m_ams_item_list.find(ams_id) != m_ams_item_list.end()) { item = m_ams_item_list[ams_id]; }
 
+    if (m_total_ext_count > 2) {
+        if (nozzle_id < 0 || nozzle_id >= static_cast<int>(m_nozzle_panes.size()))
+            return;
+
+        if (!m_extruder)
+            return;
+
+        if (on_off && item)
+            m_extruder->OnAmsLoading(true, 0, item->GetTagColr(slot_id));
+        else
+            m_extruder->OnAmsLoading(false, 0);
+        return;
+    }
+
     if (on_off && item) {
         auto col = item->GetTagColr(slot_id);
         m_extruder->OnAmsLoading(true, nozzle_id, col);
@@ -1624,6 +2004,69 @@ void AMSControl::SetAmsStep(std::string ams_id, std::string canid, AMSPassRoadTy
     else{
         return;
     }
+
+    if (m_total_ext_count > 2) {
+        const int nozzle_id = std::clamp(ams->get_nozzle_id(), 0, m_total_ext_count - 1);
+        if (nozzle_id >= static_cast<int>(m_nozzle_panes.size()))
+            return;
+        auto &pane = m_nozzle_panes[nozzle_id];
+        AMSRoadShowMode road_mode = AMSRoadShowMode::AMS_ROAD_MODE_SINGLE;
+        if (ams->get_can_count() == GENERIC_AMS_SLOT_NUM)
+            road_mode = AMSRoadShowMode::AMS_ROAD_MODE_FOUR;
+        else if (ams->get_can_count() > GENERIC_AMS_SLOT_NUM)
+            road_mode = AMSRoadShowMode::AMS_ROAD_MODE_GENERIC;
+        else if (ams->get_ams_model() == AMSModel::N3S_AMS)
+            road_mode = AMSRoadShowMode::AMS_ROAD_MODE_SINGLE_N3S;
+        else if (ams->get_ams_model() == AMSModel::AMS_LITE ||
+                 (ams->get_ams_model() == AMSModel::EXT_AMS && ams->get_ext_type() == AMSModelOriginType::LITE_EXT))
+            road_mode = AMSRoadShowMode::AMS_ROAD_MODE_AMS_LITE;
+
+        if (can_index >= 0 && can_index < static_cast<int>(info.cans.size()) && m_down_road)
+            m_down_road->SetPassRoadColour(pane.panel_pos == AMSPanelPos::LEFT_PANEL,
+                                           info.cans[can_index].material_colour);
+        if (m_down_road) {
+            if (pane.panel_pos == AMSPanelPos::LEFT_PANEL) {
+                m_down_road->UpdateLeft(1, road_mode);
+                m_down_road->UpdateRight(1, AMSRoadShowMode::AMS_ROAD_MODE_NONE);
+            } else {
+                m_down_road->UpdateLeft(1, AMSRoadShowMode::AMS_ROAD_MODE_NONE);
+                m_down_road->UpdateRight(1, road_mode);
+            }
+        }
+
+        int road_length = 0;
+
+        if (step == AMSPassRoadSTEP::AMS_ROAD_STEP_NONE) {
+            ams->SetAmsStep(ams_id, canid, type, AMSPassRoadSTEP::AMS_ROAD_STEP_NONE);
+            if (m_down_road)
+                m_down_road->UpdatePassRoad(pane.panel_pos, -1, AMSPassRoadSTEP::AMS_ROAD_STEP_NONE);
+            if (m_extruder)
+                m_extruder->OnAmsLoading(false, 0);
+        }
+        else if (step == AMSPassRoadSTEP::AMS_ROAD_STEP_COMBO_LOAD_STEP1) {
+            ams->SetAmsStep(ams_id, canid, type, AMSPassRoadSTEP::AMS_ROAD_STEP_1);
+            if (m_down_road)
+                m_down_road->UpdatePassRoad(pane.panel_pos, road_length, AMSPassRoadSTEP::AMS_ROAD_STEP_1);
+            if (m_extruder)
+                m_extruder->OnAmsLoading(false, 0);
+        }
+        else if (step == AMSPassRoadSTEP::AMS_ROAD_STEP_COMBO_LOAD_STEP2) {
+            ams->SetAmsStep(ams_id, canid, type, AMSPassRoadSTEP::AMS_ROAD_STEP_2);
+            if (m_down_road)
+                m_down_road->UpdatePassRoad(pane.panel_pos, road_length, AMSPassRoadSTEP::AMS_ROAD_STEP_2);
+            if (m_extruder)
+                m_extruder->OnAmsLoading(true, 0, ams->GetTagColr(canid));
+        }
+        else if (step == AMSPassRoadSTEP::AMS_ROAD_STEP_COMBO_LOAD_STEP3) {
+            ams->SetAmsStep(ams_id, canid, type, AMSPassRoadSTEP::AMS_ROAD_STEP_3);
+            if (m_down_road)
+                m_down_road->UpdatePassRoad(pane.panel_pos, road_length, AMSPassRoadSTEP::AMS_ROAD_STEP_3);
+            if (m_extruder)
+                m_extruder->OnAmsLoading(true, 0, ams->GetTagColr(canid));
+        }
+        return;
+    }
+
     if (can_index >= 0 && can_index < info.cans.size())
     {
         m_down_road->SetPassRoadColour(left, info.cans[can_index].material_colour);

src/slic3r/GUI/Widgets/AMSControl.hpp

@@ -47,6 +47,20 @@ public:
     void on_retry();
 
 protected:
+    struct NozzleAmsPane
+    {
+        wxPanel*          page{nullptr};
+        wxBoxSizer*       page_sizer{nullptr};
+        wxScrolledWindow* preview_panel{nullptr};
+        wxBoxSizer*       preview_sizer{nullptr};
+        wxSimplebook*     ams_book{nullptr};
+        wxBoxSizer*       ams_area{nullptr};
+        AMSPanelPos        panel_pos{AMSPanelPos::LEFT_PANEL};
+        std::vector<std::string> item_ids;
+        std::string current_ams;
+        int page_index{0};
+    };
+
     std::string  m_current_ams;
     std::string  m_current_slot_left;
     std::string  m_current_slot_right;
@@ -63,6 +77,9 @@ protected:
 
     std::string                      m_dev_id;
     std::vector<std::vector<std::string>> m_item_ids{ {}, {} };
+    std::vector<NozzleAmsPane>       m_nozzle_panes;
+    wxSimplebook*                    m_nozzle_book{nullptr};
+    int                              m_active_nozzle_id{0};
     std::vector<std::pair<std::string, std::string>> pair_id;
 
     int         m_total_ext_count = 1;
@@ -103,6 +120,7 @@ protected:
     wxSimplebook *m_simplebook_ams_left{nullptr};
     wxSimplebook *m_simplebook_ams_right{ nullptr };
     wxSimplebook *m_simplebook_bottom{nullptr};
+    wxSizerItem  *m_sizer_ams_gap{nullptr};
     wxPanel      *m_panel_down_road{ nullptr };
     int          m_left_page_index = 0;
     int          m_right_page_index = 0;
@@ -156,6 +174,7 @@ public:
     void createAms(wxSimplebook* parent, int& idx, AMSinfo info, AMSPanelPos pos);
     void createAmsPanel(wxSimplebook *parent, int &idx, std::vector<AMSinfo> infos, const std::string &series_name, const std::string &printer_type, AMSPanelPos pos, int total_ext_num);
     AMSRoadShowMode findFirstMode(AMSPanelPos pos);
+    void restore_legacy_ams_layout();
 
     AMSModel m_ams_model{AMSModel::EXT_AMS};
     AMSModel m_ext_model{AMSModel::EXT_AMS};
@@ -183,6 +202,7 @@ public:
 
     void UpdatePassRoad(std::string ams_id, AMSPassRoadType type, AMSPassRoadSTEP step);
     void CreateAms();
+    void CreateAmsMultiNozzle(const std::string& series_name, const std::string& printer_type);
     void CreateAmsDoubleNozzle(const std::string &series_name, const std::string& printer_type);
     void CreateAmsSingleNozzle(const std::string &series_name, const std::string &printer_type);
     void ClearAms();
@@ -210,6 +230,8 @@ public:
     void SetExtruder(bool on_off, int nozzle_id, std::string ams_id, std::string slot_id);
     void SetAmsStep(std::string ams_id, std::string canid, AMSPassRoadType type, AMSPassRoadSTEP step);
     void SwitchAms(std::string ams_id);
+    void SelectNozzle(int nozzle_id);
+    int  GetActiveNozzleId() const { return m_active_nozzle_id; }
 
     void msw_rescale();
     void on_filament_load(wxCommandEvent &event);

src/slic3r/GUI/Widgets/AMSItem.cpp

@@ -42,6 +42,7 @@
 #include <boost/log/trivial.hpp>
 #include <wx/timer.h>
 #include <wx/sizer.h>
+#include <wx/scrolwin.h>
 
 #include "CalibUtils.hpp"
 #include "slic3r/GUI/wxExtensions.hpp"
@@ -76,6 +77,48 @@ namespace Slic3r { namespace GUI {
 //#define AMS_SINGLE_CAN_SIZE wxSize(FromDIP(78), 144)
 #define AMS_CANS_WINDOW_SIZE wxSize(FromDIP(264), FromDIP(174))
 #define AMS_SINGLE_CAN_SIZE wxSize(FromDIP(78), FromDIP(174))
+
+int generic_ams_layout_width(wxWindow *window, int lane_count)
+{
+    const int base_width = window->FromDIP(264);
+    const int lane_width = window->FromDIP(52);
+    const int lane_gap = window->FromDIP(4);
+    if (lane_count <= 4)
+        return base_width;
+
+    // Lane centers are distributed as width * (index + 1) / (count + 1).
+    // Keep at least one card width plus the requested gap between centers.
+    return std::max(base_width, (lane_count + 1) * (lane_width + lane_gap));
+}
+
+std::vector<int> generic_ams_lane_centers(int lane_count, int width)
+{
+    std::vector<int> centers;
+    if (lane_count <= 0)
+        return centers;
+
+    centers.reserve(lane_count);
+    for (int lane = 0; lane < lane_count; ++lane)
+        centers.push_back(width * (lane + 1) / (lane_count + 1));
+    return centers;
+}
+
+int generic_ams_preview_width(wxWindow *window, int lane_count)
+{
+    const int base_width = window->FromDIP(52);
+    const int lane_width = window->FromDIP(9);
+    const int lane_gap = window->FromDIP(4);
+    if (lane_count <= 0)
+        return base_width;
+
+    return std::max(base_width, lane_count * lane_width + (lane_count + 1) * lane_gap);
+}
+
+bool use_generic_ams_layout(AMSModel model)
+{
+    return model == AMSModel::GENERIC_AMS &&
+           (!wxGetApp().preset_bundle || !wxGetApp().preset_bundle->is_bbl_vendor());
+}
 bool AMSinfo::parse_ams_info(MachineObject *obj, DevAms *ams, bool remain_flag, bool humidity_flag)
 {
     if (!ams) return false;
@@ -170,10 +213,14 @@ void AMSinfo::parse_ext_info(MachineObject* obj, DevAmsTray tray) {
     info.can_id = std::to_string(0);
     this->cans.clear();
 
-    if (tray.id == std::to_string(VIRTUAL_TRAY_MAIN_ID))
+    try {
+        const int virtual_tray_id = std::stoi(tray.id);
+        if (virtual_tray_id >= 0 && virtual_tray_id <= VIRTUAL_TRAY_MAIN_ID)
+            this->nozzle_id = VIRTUAL_TRAY_MAIN_ID - virtual_tray_id;
+    }
+    catch (...) {
         this->nozzle_id = 0;
-    else if (tray.id == std::to_string(VIRTUAL_TRAY_DEPUTY_ID))
-        this->nozzle_id = 1;
+    }
 
     if (tray.is_tray_info_ready()) {
         info.ctype = tray.ctype;
@@ -856,7 +903,11 @@ AMSextruder::AMSextruder(wxWindow *parent, wxWindowID id, int nozzle_num, const
 
 void AMSextruder::TurnOff()
 {
-    m_left_extruder->TurnOff();
+    if (m_left_extruder) m_left_extruder->TurnOff();
+    if (m_right_extruder) m_right_extruder->TurnOff();
+    for (auto *extruder : m_nozzle_extruders) {
+        if (extruder) extruder->TurnOff();
+    }
 }
 
 void AMSextruder::create(wxWindow *parent, wxWindowID id, const wxPoint &pos, const wxSize &size, int nozzle_num)
@@ -882,7 +933,7 @@ void AMSextruder::OnAmsLoading(bool load, int nozzle_id, wxColour col /*= AMS_CO
         m_left_extruder->OnAmsLoading(load, col);
         if (load) m_current_colur_deputy = col;
     }
-    else if (m_nozzle_num > 1){
+    else if (m_nozzle_num == 2){
         if (nozzle_id == MAIN_EXTRUDER_ID) {
             m_right_extruder->OnAmsLoading(load, col);
             if (m_current_colur != col){
@@ -896,6 +947,15 @@ void AMSextruder::OnAmsLoading(bool load, int nozzle_id, wxColour col /*= AMS_CO
             }
         }
     }
+    else if (m_nozzle_num > 2) {
+        if (nozzle_id >= 0 && nozzle_id < static_cast<int>(m_nozzle_extruders.size())) {
+            m_nozzle_extruders[nozzle_id]->OnAmsLoading(load, col);
+            if (load) m_current_colur = col;
+        }
+    }
+    else {
+        // Generic N Nozzles
+    }
 }
 
 /*return true if something is updated*/
@@ -905,12 +965,26 @@ bool AMSextruder::updateNozzleNum(int nozzle_num, const std::string& series_name
     m_series_name = series_name;
     m_nozzle_num = nozzle_num;
     this->DestroyChildren();
+    m_left_extruder = nullptr;
+    m_right_extruder = nullptr;
+    m_nozzle_extruders.clear();
 
-    m_right_extruder = new AMSextruderImage(this, wxID_ANY, "right_nozzle", AMS_EXTRUDER_DOUBLE_NOZZLE_BITMAP_SIZE);
+    m_bitmap_sizer = new wxBoxSizer(wxHORIZONTAL);
+    if (m_nozzle_num == 1) {
+        if (MachineObject::is_series_n(m_series_name)) {
+            m_left_extruder = new AMSextruderImage(this, wxID_ANY, "single_nozzle_n", AMS_EXTRUDER_SINGLE_NOZZLE_N_SIZE);
+        } else if (MachineObject::is_series_x(m_series_name) || MachineObject::is_series_p(m_series_name)) {
+            m_left_extruder = new AMSextruderImage(this, wxID_ANY, "single_nozzle_xp", AMS_EXTRUDER_SINGLE_NOZZLE_XP_SIZE);
+        } else {
+            m_left_extruder = new AMSextruderImage(this, wxID_ANY, "single_nozzle_xp", AMS_EXTRUDER_SINGLE_NOZZLE_XP_SIZE);
+        }
 
-    wxBoxSizer* m_bitmap_sizer = new wxBoxSizer(wxHORIZONTAL);
-    if (m_nozzle_num >= 2)
+        m_left_extruder->setShowState(true);
+        m_bitmap_sizer->Add(m_left_extruder, 0, wxALIGN_LEFT | wxALIGN_TOP, 0);
+    }
+    else if (m_nozzle_num == 2)
     {
+        m_right_extruder = new AMSextruderImage(this, wxID_ANY, "right_nozzle", AMS_EXTRUDER_DOUBLE_NOZZLE_BITMAP_SIZE);
         m_left_extruder = new AMSextruderImage(this, wxID_ANY, "left_nozzle", AMS_EXTRUDER_DOUBLE_NOZZLE_BITMAP_SIZE);
         m_left_extruder->setShowState(true);
         m_right_extruder->setShowState(true);
@@ -918,25 +992,17 @@ bool AMSextruder::updateNozzleNum(int nozzle_num, const std::string& series_name
         m_bitmap_sizer->Add(m_right_extruder, 0, wxLEFT | wxALIGN_TOP, FromDIP(2));
         m_bitmap_sizer->AddSpacer(2);
     }
+    else if (m_nozzle_num > 2) {
+        for (int nozzle_id = 0; nozzle_id < m_nozzle_num; ++nozzle_id) {
+            auto *extruder = new AMSextruderImage(this, wxID_ANY, "single_nozzle_n", AMS_EXTRUDER_SINGLE_NOZZLE_N_SIZE);
+            extruder->setShowState(true);
+            m_nozzle_extruders.push_back(extruder);
+            m_bitmap_sizer->Add(extruder, 0, wxALIGN_LEFT | wxALIGN_TOP, 0);
+        }
+    }
     else
     {
-        if (MachineObject::is_series_n(m_series_name))
-        {
-            m_left_extruder = new AMSextruderImage(this, wxID_ANY, "single_nozzle_n", AMS_EXTRUDER_SINGLE_NOZZLE_N_SIZE);
-        }
-        else if(MachineObject::is_series_x(m_series_name) || MachineObject::is_series_p(m_series_name))
-        {
-            m_left_extruder = new AMSextruderImage(this, wxID_ANY, "single_nozzle_xp", AMS_EXTRUDER_SINGLE_NOZZLE_XP_SIZE);
-        }
-        else
-        {
-            m_left_extruder = new AMSextruderImage(this, wxID_ANY, "single_nozzle_xp", AMS_EXTRUDER_SINGLE_NOZZLE_XP_SIZE);
-        }
-
-        m_left_extruder->setShowState(true);
-        m_right_extruder->setShowState(false);
-        m_bitmap_sizer->Add(m_left_extruder, 0, wxALIGN_LEFT | wxALIGN_TOP, 0);
-        m_bitmap_sizer->Add(m_right_extruder, 0, wxLEFT | wxALIGN_TOP, FromDIP(3));
+        // Generic N Nozzles
     }
 
     SetSizer(m_bitmap_sizer);
@@ -951,6 +1017,9 @@ void AMSextruder::msw_rescale()
     //m_amsSextruder->msw_rescale();
     if (m_left_extruder) m_left_extruder->msw_rescale();
     if (m_right_extruder) m_right_extruder->msw_rescale();
+    for (auto *extruder : m_nozzle_extruders) {
+        if (extruder) extruder->msw_rescale();
+    }
     Layout();
     Update();
     Refresh();
@@ -2123,7 +2192,10 @@ AMSRoadUpPart::AMSRoadUpPart(wxWindow* parent, wxWindowID id, AMSinfo info, AMSM
     m_ams_model = model;
 
     if (m_ams_model == AMSModel::GENERIC_AMS){
-        create(parent, id, pos, wxSize(FromDIP(264), FromDIP(34)));
+        const int width = use_generic_ams_layout(m_ams_model)
+            ? generic_ams_layout_width(this, static_cast<int>(m_amsinfo.cans.size()))
+            : FromDIP(264);
+        create(parent, id, pos, wxSize(width, FromDIP(34)));
     }
     else{
         create(parent, id, pos, wxSize(FromDIP(78), FromDIP(34)));
@@ -2235,6 +2307,38 @@ void AMSRoadUpPart::doRender(wxDC& dc)
     dc.SetPen(wxPen(AMS_CONTROL_GRAY500, 2, wxPENSTYLE_SOLID));
     dc.SetBrush(wxBrush(*wxTRANSPARENT_BRUSH));
 
+    if (use_generic_ams_layout(m_ams_model)) {
+        const int lane_count = static_cast<int>(m_amsinfo.cans.size());
+        if (lane_count <= 0)
+            return;
+
+        const auto lane_centers = generic_ams_lane_centers(lane_count, size.x);
+        const int height = FromDIP(21);
+        for (const int lane_center : lane_centers)
+            dc.DrawLine(lane_center, 0, lane_center, height);
+
+        if (lane_centers.size() > 1)
+            dc.DrawLine(lane_centers.front(), height, lane_centers.back(), height);
+        dc.DrawLine(size.x / 2, height, size.x / 2, size.y);
+
+        if (m_load_step != AMSPassRoadSTEP::AMS_ROAD_STEP_NONE &&
+            m_load_slot_index >= 0 && m_load_slot_index < lane_count) {
+            const int lane_center = lane_centers[m_load_slot_index];
+            dc.SetPen(wxPen(_get_diff_clr(this, m_amsinfo.cans[m_load_slot_index].material_colour), 4, wxPENSTYLE_SOLID));
+            dc.DrawLine(lane_center, 0, lane_center, height);
+            dc.DrawLine(std::min(lane_center, size.x / 2), height,
+                        std::max(lane_center, size.x / 2), height);
+            if (m_load_step == AMSPassRoadSTEP::AMS_ROAD_STEP_2 ||
+                m_load_step == AMSPassRoadSTEP::AMS_ROAD_STEP_3)
+                dc.DrawLine(size.x / 2, height, size.x / 2, size.y);
+        }
+
+        dc.SetPen(*wxTRANSPARENT_PEN);
+        dc.SetBrush(wxBrush(wxColour(194, 194, 194)));
+        dc.DrawRectangle(size.x / 2 - FromDIP(14), height - FromDIP(5), FromDIP(28), FromDIP(10));
+        return;
+    }
+
     if ((m_ams_model == N3S_AMS || m_ams_model == EXT_AMS) && m_amsinfo.cans.size() != 4){
         dc.DrawLine(((float)size.x / 2), (0), ((float)size.x / 2), (size.y));
         if (m_load_step == AMSPassRoadSTEP::AMS_ROAD_STEP_2 || m_load_step == AMSPassRoadSTEP::AMS_ROAD_STEP_3){
@@ -2360,6 +2464,45 @@ void AMSRoadDownPart::UpdateRight(int nozzle_num, AMSRoadShowMode mode)
     Refresh();
 }
 
+void AMSRoadDownPart::SetNozzleCount(int nozzle_num)
+{
+    const int new_nozzle_num = std::max(1, nozzle_num);
+    if (m_nozzle_num == new_nozzle_num &&
+        (new_nozzle_num <= 2 || static_cast<int>(m_generic_road_states.size()) == new_nozzle_num)) {
+        return;
+    }
+
+    m_nozzle_num = new_nozzle_num;
+    if (m_nozzle_num > 2)
+        m_generic_road_states.resize(m_nozzle_num);
+    else
+        m_generic_road_states.clear();
+    Refresh();
+}
+
+void AMSRoadDownPart::SetSingleSideLayout(bool enabled, AMSPanelPos pos)
+{
+    if (m_single_side_layout == enabled && m_single_side_pos == pos)
+        return;
+
+    m_single_side_layout = enabled;
+    m_single_side_pos = pos;
+    Refresh();
+}
+
+void AMSRoadDownPart::UpdateNozzle(int nozzle_id, AMSRoadShowMode mode)
+{
+    if (nozzle_id < 0) return;
+    if (nozzle_id >= static_cast<int>(m_generic_road_states.size()))
+        m_generic_road_states.resize(nozzle_id + 1);
+
+    auto &state = m_generic_road_states[nozzle_id];
+    if (state.mode == mode && m_nozzle_num > 2) return;
+    state.mode = mode;
+    m_nozzle_num = std::max(m_nozzle_num, nozzle_id + 1);
+    Refresh();
+}
+
 void AMSRoadDownPart::OnVamsLoading(bool load, wxColour col /*= AMS_CONTROL_GRAY500*/)
 {
     /*m_vams_loading = load;
@@ -2389,6 +2532,17 @@ void AMSRoadDownPart::SetPassRoadColour(bool left, wxColour col)
     Refresh();
 }
 
+void AMSRoadDownPart::SetPassRoadColour(int nozzle_id, wxColour col)
+{
+    if (nozzle_id < 0) return;
+    if (nozzle_id >= static_cast<int>(m_generic_road_states.size()))
+        m_generic_road_states.resize(nozzle_id + 1);
+
+    if (m_generic_road_states[nozzle_id].road_color == col) return;
+    m_generic_road_states[nozzle_id].road_color = col;
+    Refresh();
+}
+
 void AMSRoadDownPart::SetShowMode(AMSRoadShowMode left_mode, AMSRoadShowMode right_mode)
 {
     if (m_left_rode_mode == left_mode && m_right_rode_mode == right_mode) { return; }
@@ -2433,8 +2587,34 @@ void AMSRoadDownPart::doRender(wxDC& dc)
     /*if (m_road_color.Alpha() == 0) { dc.SetPen(wxPen(*wxWHITE, m_passroad_width, wxPENSTYLE_SOLID)); }
     else { dc.SetPen(wxPen(m_road_color, m_passroad_width, wxPENSTYLE_SOLID)); }*/
     dc.SetPen(wxPen(AMS_CONTROL_GRAY500, 2, wxPENSTYLE_SOLID));
+
+    if (m_nozzle_num > 2) {
+        const int nozzle_count = std::min(m_nozzle_num, static_cast<int>(m_generic_road_states.size()));
+        for (int nozzle_id = 0; nozzle_id < nozzle_count; ++nozzle_id) {
+            const auto &state = m_generic_road_states[nozzle_id];
+            if (state.mode == AMSRoadShowMode::AMS_ROAD_MODE_NONE) continue;
+
+            const int x = size.x * (nozzle_id + 1) / (nozzle_count + 1);
+            dc.SetPen(wxPen(AMS_CONTROL_GRAY500, 2, wxPENSTYLE_SOLID));
+            dc.DrawLine(x, size.y / 2, x, size.y);
+
+            if (state.road_length > 0 &&
+                (state.pass_road_step == AMSPassRoadSTEP::AMS_ROAD_STEP_2 ||
+                 state.pass_road_step == AMSPassRoadSTEP::AMS_ROAD_STEP_3)) {
+                dc.SetPen(wxPen(_get_diff_clr(this, state.road_color), 4, wxPENSTYLE_SOLID));
+                dc.DrawLine(x - FromDIP(state.road_length), size.y / 2, x, size.y / 2);
+            }
+        }
+        return;
+    }
+
     auto xpos = left_nozzle_pos.x;
-    if (m_left_rode_mode == AMSRoadShowMode::AMS_ROAD_MODE_NONE || m_right_rode_mode == AMSRoadShowMode::AMS_ROAD_MODE_NONE){
+    if (m_single_side_layout) {
+        dc.DrawLine(size.x / 2, 0, size.x / 2, size.y);
+    }
+    else if (
+        (m_left_rode_mode == AMSRoadShowMode::AMS_ROAD_MODE_NONE ||
+         m_right_rode_mode == AMSRoadShowMode::AMS_ROAD_MODE_NONE)){
         auto length = 50;
         if (m_left_rode_mode == AMSRoadShowMode::AMS_ROAD_MODE_AMS_LITE || m_right_rode_mode == AMSRoadShowMode::AMS_ROAD_MODE_AMS_LITE)
             length = -13;
@@ -2465,6 +2645,9 @@ void AMSRoadDownPart::doRender(wxDC& dc)
         case AMSRoadShowMode::AMS_ROAD_MODE_AMS_LITE:
             dc.DrawLine(left_nozzle_pos.x, 0, left_nozzle_pos.x, size.y);
             break;
+        case AMSRoadShowMode::AMS_ROAD_MODE_GENERIC:
+            // Generic N-lane geometry is intentionally left unimplemented.
+            break;
         default:
             break;
         }
@@ -2492,23 +2675,41 @@ void AMSRoadDownPart::doRender(wxDC& dc)
             dc.DrawLine(left_nozzle_pos.x, (size.y / 2), left_nozzle_pos.x + FromDIP(145), (size.y / 2));
             dc.DrawLine(left_nozzle_pos.x + FromDIP(145), 0, left_nozzle_pos.x + FromDIP(145), (size.y / 2));
             break;
+        case AMSRoadShowMode::AMS_ROAD_MODE_GENERIC:
+            // Generic N-lane geometry is intentionally left unimplemented.
+            break;
         default:
             break;
         }
     }
 
+    if (m_single_side_layout) {
+        if (m_pass_road_left_step == AMSPassRoadSTEP::AMS_ROAD_STEP_2 ||
+            m_pass_road_left_step == AMSPassRoadSTEP::AMS_ROAD_STEP_3) {
+            dc.SetPen(wxPen(_get_diff_clr(this, m_road_color[1]), 4, wxPENSTYLE_SOLID));
+            dc.DrawLine(size.x / 2, 0, size.x / 2, size.y);
+        }
+        return;
+    }
+
     if (m_right_rode_mode != AMSRoadShowMode::AMS_ROAD_MODE_AMS_LITE){
-        if (m_nozzle_num == 2) {
+        if (m_nozzle_num == 1) {
+            if (m_right_rode_mode != AMSRoadShowMode::AMS_ROAD_MODE_NONE && m_left_rode_mode != AMSRoadShowMode::AMS_ROAD_MODE_NONE) {
+                dc.DrawLine((left_nozzle_pos.x), (size.y / 2), (right_nozzle_pos.x), (size.y / 2));
+            }
+            const auto &nozzle_pos = m_single_side_layout && m_single_side_pos == AMSPanelPos::RIGHT_PANEL
+                ? right_nozzle_pos
+                : left_nozzle_pos;
+            dc.DrawLine(nozzle_pos.x, (size.y / 2), nozzle_pos.x, (size.y));
+        }
+        else if (m_nozzle_num == 2) {
             /*dc.DrawLine(FromDIP(left_nozzle_pos.x), FromDIP(size.y / 2), FromDIP(left_nozzle_pos.x), FromDIP(size.y));
             dc.DrawLine(FromDIP(right_nozzle_pos.x), FromDIP(size.y / 2), FromDIP(right_nozzle_pos.x), FromDIP(size.y));*/
             dc.DrawLine((left_nozzle_pos.x), (size.y / 2), (left_nozzle_pos.x), (size.y));
             dc.DrawLine((right_nozzle_pos.x), (size.y / 2), (right_nozzle_pos.x), (size.y));
         }
         else {
-            if (m_right_rode_mode != AMSRoadShowMode::AMS_ROAD_MODE_NONE && m_left_rode_mode != AMSRoadShowMode::AMS_ROAD_MODE_NONE) {
-                dc.DrawLine((left_nozzle_pos.x), (size.y / 2), (right_nozzle_pos.x), (size.y / 2));
-            }
-            dc.DrawLine((left_nozzle_pos.x), (size.y / 2), (left_nozzle_pos.x), (size.y));
+            // Generic N Nozzles
         }
     }
 
@@ -2533,10 +2734,16 @@ void AMSRoadDownPart::doRender(wxDC& dc)
                  dc.DrawLine(xpos, size.y / 2, xpos, size.y);*/
                 int x   = left_nozzle_pos.x;
                 int len = m_right_road_length;
-                if (m_nozzle_num == 2) {
+                if (m_nozzle_num == 1) {
+                    // Keep the single-nozzle path anchored at the left nozzle.
+                }
+                else if (m_nozzle_num == 2) {
                     x   = right_nozzle_pos.x;
                     len = len - 14;
                 }
+                else {
+                    // Generic N Nozzles
+                }
                 dc.DrawLine(((x)), (size.y / 2), x + FromDIP(len), (size.y / 2));
                 dc.DrawLine(x + FromDIP(len), (0), x + FromDIP(len), (size.y / 2));
                 dc.DrawLine((x), (size.y / 2), (x), (size.y));
@@ -2544,10 +2751,16 @@ void AMSRoadDownPart::doRender(wxDC& dc)
             else{
                 int x = left_nozzle_pos.x;
                 int len = m_right_road_length;
-                if (m_nozzle_num == 2) {
+                if (m_nozzle_num == 1) {
+                    // Keep the single-nozzle path anchored at the left nozzle.
+                }
+                else if (m_nozzle_num == 2) {
                     x = right_nozzle_pos.x;
                     len = len - 14;
                 }
+                else {
+                    // Generic N Nozzles
+                }
                 dc.DrawLine(((x)), (size.y / 2), x + FromDIP(len), (size.y / 2));
                 dc.DrawLine(x + FromDIP(len), (0), x + FromDIP(len), (size.y / 2));
                 dc.DrawLine((x), (size.y / 2), (x), (size.y));
@@ -2571,7 +2784,7 @@ void AMSRoadDownPart::doRender(wxDC& dc)
 }
 
 void AMSRoadDownPart::UpdatePassRoad(AMSPanelPos pos, int len, AMSPassRoadSTEP step) {
-    if (m_nozzle_num >= 2){
+    if (m_nozzle_num == 2){
         if (pos == AMSPanelPos::LEFT_PANEL){
             if (m_left_road_length == len && m_pass_road_left_step == step){ return; }
             m_left_road_length = len;;
@@ -2583,7 +2796,7 @@ void AMSRoadDownPart::UpdatePassRoad(AMSPanelPos pos, int len, AMSPassRoadSTEP s
             m_pass_road_right_step = step;
         }
     }
-    else{
+    else if (m_nozzle_num == 1){
         if (pos == AMSPanelPos::LEFT_PANEL) {
             if (m_left_road_length == len && m_pass_road_left_step == step && m_right_road_length == -1) { return; }
             m_left_road_length = len;
@@ -2597,6 +2810,22 @@ void AMSRoadDownPart::UpdatePassRoad(AMSPanelPos pos, int len, AMSPassRoadSTEP s
             m_pass_road_right_step = step;
         }
     }
+    else {
+        // Generic N Nozzles
+    }
+    Refresh();
+}
+
+void AMSRoadDownPart::UpdatePassRoad(int nozzle_id, int len, AMSPassRoadSTEP step)
+{
+    if (nozzle_id < 0) return;
+    if (nozzle_id >= static_cast<int>(m_generic_road_states.size()))
+        m_generic_road_states.resize(nozzle_id + 1);
+
+    auto &state = m_generic_road_states[nozzle_id];
+    if (state.road_length == len && state.pass_road_step == step) return;
+    state.road_length = len;
+    state.pass_road_step = step;
     Refresh();
 }
 
@@ -2615,7 +2844,10 @@ AMSPreview::AMSPreview(wxWindow* parent, wxWindowID id, AMSinfo amsinfo, AMSMode
 {
     wxWindow::Create(parent, id, pos);
     if (itemType == AMSModel::GENERIC_AMS || itemType == AMSModel::AMS_LITE || itemType == AMSModel::N3F_AMS) {
-        create(parent, id, pos, AMS_PREV_FOUR_SIZE);
+        if (itemType == AMSModel::GENERIC_AMS && use_generic_ams_layout(itemType))
+            create(parent, id, pos, wxSize(generic_ams_preview_width(this, static_cast<int>(amsinfo.cans.size())), AMS_PREV_FOUR_SIZE.y));
+        else
+            create(parent, id, pos, AMS_PREV_FOUR_SIZE);
     }
     else {
         create(parent, id, pos, AMS_PREV_SINGLE_SIZE);
@@ -2650,7 +2882,13 @@ void AMSPreview::UpdateInfo(AMSinfo amsinfo)
     m_amsinfo = amsinfo;
     m_ams_item_type = amsinfo.ams_type;
 
-    if (m_ams_item_type == AMSModel::GENERIC_AMS || m_ams_item_type == AMSModel::AMS_LITE || m_ams_item_type == AMSModel::N3F_AMS) {
+    if (m_ams_item_type == AMSModel::GENERIC_AMS && use_generic_ams_layout(m_ams_item_type)) {
+        const wxSize generic_size(generic_ams_preview_width(this, static_cast<int>(m_amsinfo.cans.size())), AMS_PREV_FOUR_SIZE.y);
+        SetSize(generic_size);
+        SetMinSize(generic_size);
+        SetMaxSize(generic_size);
+    }
+    else if (m_ams_item_type == AMSModel::GENERIC_AMS || m_ams_item_type == AMSModel::AMS_LITE || m_ams_item_type == AMSModel::N3F_AMS) {
         SetMinSize(AMS_PREV_FOUR_SIZE);
         SetMaxSize(AMS_PREV_FOUR_SIZE);
     } else {
@@ -2758,8 +2996,41 @@ void AMSPreview::doRender(wxDC &dc)
     dc.DrawRoundedRectangle(0, 0, size.x, size.y, FromDIP(3));
 
     auto left = 0;
-    //four slot
-    if (m_ams_item_type != AMSModel::EXT_AMS && m_ams_item_type != AMSModel::N3S_AMS){
+    // Generic AMS previews use the same normalized lane centers as the card row and connector.
+    if (m_ams_item_type == AMSModel::GENERIC_AMS && use_generic_ams_layout(m_ams_item_type)) {
+        const int lane_count = static_cast<int>(m_amsinfo.cans.size());
+        const auto lane_centers = generic_ams_lane_centers(lane_count, size.x);
+        const int cube_width = FromDIP(9);
+        const int cube_height = FromDIP(14);
+
+        for (int lane = 0; lane < lane_count; ++lane) {
+            const Caninfo &can = m_amsinfo.cans[lane];
+            const int cube_left = lane_centers[lane] - cube_width / 2;
+            const int cube_top = (size.y - cube_height) / 2;
+            wxRect rect(cube_left, cube_top, cube_width, cube_height);
+
+            if (can.material_colour.Alpha() == 0) {
+                if (wxGetApp().dark_mode())
+                    dc.DrawBitmap(m_ts_bitmap_cube_dark.bmp(), cube_left - FromDIP(1), (size.y - m_ts_bitmap_cube_dark.GetBmpHeight()) / 2);
+                else
+                    dc.DrawBitmap(m_ts_bitmap_cube.bmp(), cube_left - FromDIP(1), (size.y - m_ts_bitmap_cube.GetBmpHeight()) / 2);
+            }
+            else if (can.material_state == AMSCanType::AMS_CAN_TYPE_EMPTY) {
+                dc.SetPen(wxPen(wxColor(0, 0, 0)));
+                dc.DrawLine(rect.GetRight() - FromDIP(1), rect.GetTop() + FromDIP(1),
+                            rect.GetLeft() + FromDIP(1), rect.GetBottom() - FromDIP(1));
+            }
+            else {
+                wxColour color = can.material_colour;
+                change_the_opacity(color);
+                dc.SetPen(wxPen(*wxTRANSPARENT_PEN));
+                dc.SetBrush(wxBrush(color));
+                dc.DrawRoundedRectangle(rect, 2);
+            }
+        }
+    }
+    // four slot
+    else if (m_ams_item_type != AMSModel::EXT_AMS && m_ams_item_type != AMSModel::N3S_AMS){
         left =  FromDIP(8);
         for (std::vector<Caninfo>::iterator iter = m_amsinfo.cans.begin(); iter != m_amsinfo.cans.end(); iter++) {
 
@@ -3158,10 +3429,19 @@ AmsItem::AmsItem(wxWindow *parent,AMSinfo info,  AMSModel model, AMSPanelPos pos
     m_panel_pos = pos;
 
     if (m_ams_model == AMSModel::GENERIC_AMS){
-        wxWindow::Create(parent, wxID_ANY, wxDefaultPosition, AMS_CANS_WINDOW_SIZE);
-        SetSize(AMS_CANS_WINDOW_SIZE);
-        SetMinSize(AMS_CANS_WINDOW_SIZE);
-        SetMaxSize(AMS_CANS_WINDOW_SIZE);
+        const int lane_count = static_cast<int>(m_info.cans.size());
+        const int width = use_generic_ams_layout(m_ams_model) && lane_count <= 8
+            ? generic_ams_layout_width(this, lane_count)
+            : FromDIP(264);
+        const wxSize generic_size(width, FromDIP(174));
+        wxWindow::Create(parent, wxID_ANY, wxDefaultPosition, generic_size);
+        SetSize(generic_size);
+        SetMinSize(generic_size);
+        // For large lane counts the card is a viewport, not the lane strip. Let
+        // its parent allocate the available width; the scrolled child retains
+        // the wider virtual content size.
+        if (!(use_generic_ams_layout(m_ams_model) && lane_count > 8))
+            SetMaxSize(generic_size);
     }
     else{
         wxWindow::Create(parent, wxID_ANY, wxDefaultPosition, AMS_SINGLE_CAN_SIZE);
@@ -3187,12 +3467,43 @@ void AmsItem::create(wxWindow *parent)
     if (m_ams_model != AMSModel::AMS_LITE) {
         sizer_can = new wxBoxSizer(wxHORIZONTAL);
         sizer_item = new wxBoxSizer(wxVERTICAL);
-        auto it = m_info.cans.begin();
-        for (; it != m_info.cans.end(); it++) {
-            AddCan(*it, m_can_count, m_info.cans.size(), sizer_can);
+        const bool generic_layout = use_generic_ams_layout(m_ams_model);
+        const int lane_count = static_cast<int>(m_info.cans.size());
+        const int content_width = generic_layout ? generic_ams_layout_width(this, lane_count) : 0;
+        const bool scroll_lanes = generic_layout && lane_count > 8;
+        const auto lane_centers = generic_layout
+            ? generic_ams_lane_centers(lane_count, content_width)
+            : std::vector<int>();
+
+        m_can_parent = this;
+        if (scroll_lanes) {
+            m_can_scroll = new wxScrolledWindow(this, wxID_ANY);
+            m_can_scroll->SetScrollRate(FromDIP(10), 0);
+            m_can_scroll->SetMinSize(wxSize(FromDIP(264), FromDIP(143)));
+            m_can_scroll->SetBackgroundColour(StateColor::darkModeColorFor(AMS_CONTROL_DEF_LIB_BK_COLOUR));
+            m_can_scroll_sizer = new wxBoxSizer(wxVERTICAL);
+            m_can_scroll->SetSizer(m_can_scroll_sizer);
+            m_can_parent = m_can_scroll;
+        }
+
+        int previous_right = 0;
+        for (int can_index = 0; can_index < lane_count; ++can_index) {
+            if (generic_layout) {
+                const int left = lane_centers[can_index] - FromDIP(26);
+                sizer_can->AddSpacer(std::max(0, left - previous_right));
+                AddCan(m_info.cans[can_index], m_can_count, m_info.cans.size(), sizer_can);
+                previous_right = left + FromDIP(52);
+            }
+            else {
+                AddCan(m_info.cans[can_index], m_can_count, m_info.cans.size(), sizer_can);
+            }
             m_can_count++;
         }
-        it = m_info.cans.begin();
+        if (generic_layout)
+            sizer_can->AddSpacer(std::max(0, content_width - previous_right));
+        if (generic_layout)
+            sizer_can->SetMinSize(wxSize(content_width, -1));
+
         //auto        road_panel = new wxWindow(this, wxID_ANY);
         //auto        road_panel = new wxPanel(this, wxID_ANY);
         //road_panel->SetSize(AMS_CAN_ROAD_SIZE);
@@ -3207,11 +3518,18 @@ void AmsItem::create(wxWindow *parent)
                 sizer_item->Add(m_ext_image, 0, wxALIGN_CENTER, 0);
             }
         }
-        m_panel_road = new AMSRoadUpPart(this, wxID_ANY, m_info, m_ams_model);
+        m_panel_road = new AMSRoadUpPart(m_can_parent, wxID_ANY, m_info, m_ams_model);
 
-        sizer_item->Add(sizer_can, 0, wxALIGN_CENTER_HORIZONTAL, 0);
-        //sizer_item->Add(m_panel_road, 0, wxALIGN_CENTER_HORIZONTAL, 0);
-        sizer_item->Add(m_panel_road, 1, wxEXPAND);
+        if (scroll_lanes) {
+            m_can_scroll_sizer->Add(sizer_can, 0, wxALIGN_LEFT, 0);
+            m_can_scroll_sizer->Add(m_panel_road, 0, wxALIGN_LEFT, 0);
+            sizer_item->Add(m_can_scroll, 1, wxEXPAND);
+        }
+        else {
+            sizer_item->Add(sizer_can, 0, wxALIGN_CENTER_HORIZONTAL, 0);
+            //sizer_item->Add(m_panel_road, 0, wxALIGN_CENTER_HORIZONTAL, 0);
+            sizer_item->Add(m_panel_road, 1, wxEXPAND);
+        }
 
         SetSizer(sizer_item);
     }
@@ -3235,13 +3553,17 @@ void AmsItem::create(wxWindow *parent)
 
     Layout();
     Fit();
+    if (m_can_scroll) {
+        m_can_scroll->Layout();
+        m_can_scroll->FitInside();
+    }
     Thaw();
     //Refresh();
 }
 
 void AmsItem::AddCan(Caninfo caninfo, int canindex, int maxcan, wxBoxSizer* sizer)
 {
-    auto        amscan = new wxWindow(this, wxID_ANY);
+    auto        amscan = new wxWindow(m_can_parent ? m_can_parent : this, wxID_ANY);
 
     amscan->SetSize(wxSize(FromDIP(52), FromDIP(109)));
     amscan->SetMinSize(wxSize(FromDIP(52), FromDIP(109)));
@@ -3322,7 +3644,8 @@ void AmsItem::AddCan(Caninfo caninfo, int canindex, int maxcan, wxBoxSizer* size
     amscan->Layout();
     amscan->Fit();
 
-    sizer->Add(amscan, 0, wxUP | wxLEFT | wxRIGHT, FromDIP(5));
+    const int margin = use_generic_ams_layout(m_ams_model) ? 0 : FromDIP(5);
+    sizer->Add(amscan, 0, wxUP | wxLEFT | wxRIGHT, margin);
 
     m_can_lib_list[caninfo.can_id] = m_panel_lib;
     //m_can_road_list[caninfo.can_id] = m_panel_road;
@@ -3447,6 +3770,10 @@ void AmsItem::UpdateInfo(AMSinfo info)
     }
 
     Layout();
+    if (m_can_scroll) {
+        m_can_scroll->Layout();
+        m_can_scroll->FitInside();
+    }
 }
 
 void AmsItem::SetDefSelectCan()

src/slic3r/GUI/Widgets/AMSItem.hpp

@@ -30,6 +30,7 @@
 #include <wx/string.h>
 #include <wx/timer.h>
 #include <wx/sizer.h>
+#include <wx/scrolwin.h>
 
 #include "slic3r/GUI/DeviceCore/DevFilaSwitch.h" // Orca: DevFilaSwitch::SwitchPos for inlet-aware AMS placement
 
@@ -96,6 +97,7 @@ enum class AMSRoadShowMode : int {
     AMS_ROAD_MODE_SINGLE,
     AMS_ROAD_MODE_SINGLE_N3S,
     AMS_ROAD_MODE_AMS_LITE,
+    AMS_ROAD_MODE_GENERIC,
     AMS_ROAD_MODE_NONE
 };
 
@@ -480,6 +482,7 @@ public:
     //AMSextruderImage *m_amsSextruder{nullptr};
     AMSextruderImage* m_left_extruder = nullptr;
     AMSextruderImage* m_right_extruder = nullptr;
+    std::vector<AMSextruderImage*> m_nozzle_extruders;
     AMSextruder(wxWindow *parent, wxWindowID id, int nozzle_num, const wxPoint &pos = wxDefaultPosition, const wxSize &size = wxDefaultSize);
     ~AMSextruder();
 
@@ -681,11 +684,16 @@ public:
     // void                         Update(AMSRoadDownPartMode nozzle, AMSRoadShowMode left_mode, AMSRoadShowMode right_mode, int left_len, int right_len);
     void UpdateLeft(int nozzle_num, AMSRoadShowMode mode);
     void UpdateRight(int nozzle_num, AMSRoadShowMode mode);
+    void SetNozzleCount(int nozzle_num);
+    void SetSingleSideLayout(bool enabled, AMSPanelPos pos = AMSPanelPos::LEFT_PANEL);
+    void UpdateNozzle(int nozzle_id, AMSRoadShowMode mode);
 
     void OnVamsLoading(bool load, wxColour col = AMS_CONTROL_GRAY500);
     void SetPassRoadColour(bool left, wxColour col);
+    void SetPassRoadColour(int nozzle_id, wxColour col);
     void SetShowMode(AMSRoadShowMode left_mode, AMSRoadShowMode right_mode);
     void UpdatePassRoad(AMSPanelPos pos, int len, AMSPassRoadSTEP step);
+    void UpdatePassRoad(int nozzle_id, int len, AMSPassRoadSTEP step);
 
     void paintEvent(wxPaintEvent& evt);
     void render(wxDC& dc);
@@ -698,6 +706,8 @@ private:
     AMSRoadShowMode m_left_rode_mode       = {AMSRoadShowMode::AMS_ROAD_MODE_FOUR};
     AMSRoadShowMode m_right_rode_mode      = {AMSRoadShowMode::AMS_ROAD_MODE_FOUR};
     bool            m_selected             = {false};
+    bool            m_single_side_layout   = {false};
+    AMSPanelPos     m_single_side_pos     = {AMSPanelPos::LEFT_PANEL};
 
     int             m_left_road_length     = {-1};
     int             m_right_road_length    = {-1};
@@ -705,6 +715,15 @@ private:
     AMSPassRoadSTEP m_pass_road_right_step = {AMSPassRoadSTEP::AMS_ROAD_STEP_NONE};
 
     std::map<int, wxColour> m_road_color;
+
+    struct GenericRoadState
+    {
+        AMSRoadShowMode mode{AMSRoadShowMode::AMS_ROAD_MODE_NONE};
+        int road_length{-1};
+        AMSPassRoadSTEP pass_road_step{AMSPassRoadSTEP::AMS_ROAD_STEP_NONE};
+        wxColour road_color{AMS_CONTROL_GRAY500};
+    };
+    std::vector<GenericRoadState> m_generic_road_states;
 };
 
 /*************************************************
@@ -864,6 +883,9 @@ private:
 
     std::map<std::string, AMSLib*>      m_can_lib_list;
     //std::map<std::string, AMSRoad*>     m_can_road_list;
+    wxScrolledWindow* m_can_scroll = { nullptr };
+    wxBoxSizer*       m_can_scroll_sizer = { nullptr };
+    wxWindow*         m_can_parent = { nullptr };
     AMSRoadUpPart* m_panel_road = { nullptr };
     std::map<std::string, AMSrefresh*>  m_can_refresh_list;
     AMSHumidity* m_humidity = { nullptr };

src/slic3r/GUI/Widgets/MultiNozzleSync.cpp

@@ -420,6 +420,14 @@ ExtruderBadge::ExtruderBadge(wxWindow* parent) : wxPanel(parent)
 
 void ExtruderBadge::SetExtruderInfo(int extruder_id, const std::string& diameter, const NozzleVolumeType& volume_type)
 {
+    // The badge renders exactly two extruders (left/right). A generic non-BBL printer with
+    // N > 2 can report an out-of-range id here (see MultiNozzleStatusTable::UpdateRackInfo);
+    // reject it rather than writing past the two-element lists.
+    if (extruder_id < 0 || extruder_id >= static_cast<int>(m_diameter_list.size())) {
+        BOOST_LOG_TRIVIAL(warning) << __FUNCTION__ << ": out-of-range extruder_id " << extruder_id;
+        return;
+    }
+
     m_diameter_list[extruder_id] = diameter;
     m_volume_type_list[extruder_id] = volume_type;
 
@@ -867,14 +875,21 @@ void MultiNozzleStatusTable::UpdateRackInfo(std::weak_ptr<DevNozzleRack> rack)
         bool has_right = false;
         for (auto& elem : nozzles_in_extruder) {
             auto& nozzle = elem.second;
-            int extruder_id = nozzle.AtLeftExtruder() ? 0 : 1;
-            if (nozzle.AtRightExtruder())
-                has_right = true;
+
+            int extruder_id{};
+            if (wxGetApp().preset_bundle->is_bbl_vendor()) {
+                extruder_id = nozzle.AtLeftExtruder() ? 0 : 1;
+                if (nozzle.AtRightExtruder())
+                    has_right = true;
+            }
+            else
+                extruder_id = nozzle.GetExtruderId();
 
             NozzleVolumeType volume_type = DevNozzle::ToNozzleVolumeType(nozzle.m_nozzle_flow);
 
             m_badge->SetExtruderInfo(extruder_id, format_diameter_to_str(nozzle.GetNozzleDiameter()), volume_type);
         }
+        // TODO: Update for N extruders
         m_badge->SetExtruderValid(has_right);
     }
 }

src/slic3r/GUI/Widgets/TempInput.cpp

@@ -184,6 +184,9 @@ void TempInput::SetFinish()
     wxCommandEvent event(wxCUSTOMEVT_SET_TEMP_FINISH);
     event.SetInt(temp_type);
     event.SetString(wxString::Format("%d", m_input_type));
+    // N-extruder temp controls all share TEMP_OF_NORMAL_TYPE, so the string payload above can't
+    // tell them apart; carry widget identity so the listener can find which one fired.
+    event.SetEventObject(this);
     wxPostEvent(this->GetParent(), event);
 }
 

src/slic3r/Utils/MoonrakerPrinterAgent.cpp

@@ -1057,6 +1057,25 @@ int MoonrakerPrinterAgent::handle_request(const std::string& dev_id, const std::
             }
         }
 
+        // Tool selection is printer-specific G-code. Moonraker forwards the
+        // conventional T<index> command to Klipper, where the printer can
+        // implement logical selection or a physical toolhead attach macro.
+        if (cmd == "select_extruder") {
+            if (!json["print"].contains("extruder_index") || !json["print"]["extruder_index"].is_number_integer()) {
+                BOOST_LOG_TRIVIAL(error) << "MoonrakerPrinterAgent: select_extruder missing integer extruder_index, full json: " << json_str;
+                return BAMBU_NETWORK_ERR_INVALID_RESULT;
+            }
+
+            const int extruder_idx = json["print"]["extruder_index"].get<int>();
+            if (extruder_idx < 0) {
+                BOOST_LOG_TRIVIAL(error) << "MoonrakerPrinterAgent: select_extruder received negative extruder_index: " << extruder_idx;
+                return BAMBU_NETWORK_ERR_INVALID_RESULT;
+            }
+
+            send_gcode_async(dev_id, "T" + std::to_string(extruder_idx));
+            return BAMBU_NETWORK_SUCCESS;
+        }
+
         if (cmd == "home") {
             send_gcode_async(dev_id, "G28");
             return BAMBU_NETWORK_SUCCESS;
@@ -1153,7 +1172,7 @@ bool MoonrakerPrinterAgent::query_printer_status(const std::string& base_url,
                                                  nlohmann::json&    status,
                                                  std::string&       error) const
 {
-    std::string url = join_url(base_url, "/printer/objects/query?print_stats&virtual_sdcard&extruder&heater_bed&fan");
+    std::string url = join_url(base_url, "/printer/objects/query?print_stats&virtual_sdcard&toolhead&extruder&heater_bed&fan");
 
     std::string response_body;
     bool        success = false;
@@ -1566,11 +1585,12 @@ void MoonrakerPrinterAgent::run_status_stream(std::string dev_id, std::string ba
                 }
 
                 for (const auto& name : this->available_objects) {
-                    if (name == "extruder" || name.rfind("extruder", 0) == 0) {
+                    const bool is_main_extruder = name == "extruder";
+                    const bool is_additional_extruder =
+                        name.rfind("extruder", 0) == 0 && name.size() > 8 &&
+                        std::all_of(name.begin() + 8, name.end(), [](unsigned char c) { return std::isdigit(c) != 0; });
+                    if (is_main_extruder || is_additional_extruder) {
                         subscribe_objects.insert(name);
-                        if (name == "extruder") {
-                            break;
-                        }
                     }
                 }
             } else {
@@ -1866,6 +1886,81 @@ nlohmann::json MoonrakerPrinterAgent::build_print_payload_locked() const
         }
     }
 
+    // MachineObject::parse_new_info() only parses device.extruder when the four
+    // legacy new-protocol fields are present. Moonraker has no equivalents, so
+    // empty values act as compatibility markers without enabling any features.
+    std::map<int, const nlohmann::json*> extruder_status;
+    for (const auto& item : status_cache.items()) {
+        int extruder_id = -1;
+        if (item.key() == "extruder") {
+            extruder_id = 0;
+        } else if (item.key().rfind("extruder", 0) == 0 && item.key().size() > 8 &&
+                   std::all_of(item.key().begin() + 8, item.key().end(), [](unsigned char c) { return std::isdigit(c) != 0; })) {
+            try {
+                extruder_id = std::stoi(item.key().substr(8));
+            } catch (...) {
+                extruder_id = -1;
+            }
+        }
+        if (extruder_id >= 0 && item.value().is_object()) {
+            extruder_status.emplace(extruder_id, &item.value());
+        }
+    }
+
+    if (!extruder_status.empty()) {
+        auto& device_extruder = payload["print"]["device"]["extruder"];
+
+        int current_extruder_id = 0;
+        if (status_cache.contains("toolhead") && status_cache["toolhead"].is_object() &&
+            status_cache["toolhead"].contains("extruder") && status_cache["toolhead"]["extruder"].is_string()) {
+            const std::string active_extruder = status_cache["toolhead"]["extruder"].get<std::string>();
+            if (active_extruder != "extruder" && active_extruder.rfind("extruder", 0) == 0 && active_extruder.size() > 8 &&
+                std::all_of(active_extruder.begin() + 8, active_extruder.end(), [](unsigned char c) { return std::isdigit(c) != 0; })) {
+                try {
+                    const int parsed_id = std::stoi(active_extruder.substr(8));
+                    if (parsed_id >= 0 && parsed_id < 16 && extruder_status.count(parsed_id) != 0) {
+                        current_extruder_id = parsed_id;
+                    }
+                } catch (...) {
+                    // Keep the main extruder as the fallback for malformed status data.
+                }
+            }
+        }
+
+        const int extruder_count = std::min<int>(static_cast<int>(extruder_status.size()), 0xF);
+        device_extruder["state"] = extruder_count | (current_extruder_id << 4);
+        device_extruder["info"] = nlohmann::json::array();
+
+        auto encoded_temperature = [](const nlohmann::json& status, const char* key) {
+            if (!status.contains(key) || !status[key].is_number()) {
+                return 0;
+            }
+            const double temperature = status[key].get<double>();
+            return std::clamp(static_cast<int>(temperature + 0.5), 0, 65535);
+        };
+
+        for (const auto& [extruder_id, status] : extruder_status) {
+            const int current_temperature = encoded_temperature(*status, "temperature");
+            const int target_temperature  = encoded_temperature(*status, "target");
+            device_extruder["info"].push_back({
+                {"id", extruder_id},
+                {"filam_bak", nlohmann::json::array()},
+                {"info", 1 << 3}, // The configured Moonraker extruder has a toolhead.
+                {"temp", current_temperature | (target_temperature << 16)},
+                {"spre", 0},
+                {"snow", 0},
+                {"star", 0},
+                {"stat", 0},
+                {"hnow", 0},
+            });
+        }
+
+        payload["print"]["cfg"]  = "";
+        payload["print"]["fun"]  = "";
+        payload["print"]["aux"]  = "";
+        payload["print"]["stat"] = "";
+    }
+
     if (status_cache.contains("heater_bed") && status_cache["heater_bed"].is_object()) {
         const auto& bed = status_cache["heater_bed"];
         if (bed.contains("temperature") && bed["temperature"].is_number()) {

src/slic3r/plugin/CloudPluginService.cpp

@@ -197,7 +197,6 @@ bool CloudPluginService::download_cloud_plugin(PluginDescriptor& entry,
     Http http = Http::get(download_url);
     http.timeout_connect(30)
         .timeout_max(300)
-        .tls_verify(true)
         .on_complete([&body, &http_status](std::string response_body, unsigned status) {
             body        = std::move(response_body);
             http_status = status;

tests/libslic3r/test_config_variant_expansion.cpp

@@ -800,6 +800,43 @@ TEST_CASE("A per-variant filament option read with a single value gives it to ev
     REQUIRE(config.option<ConfigOptionFloats>("pressure_advance")->values == std::vector<double>({0.021, 0.021, 0.021}));
 }
 
+// Machine limits (printer_options_with_variant_2) hold a (normal, silent) pair per printer variant, so the
+// printer Tab's Motion ability page can edit each extruder's own limits.
+TEST_CASE("set_num_extruders gives every printer variant its own pair of machine limits", "[Config]")
+{
+    DynamicPrintConfig config = DynamicPrintConfig::full_print_config();
+    auto speed_x = [&config]() { return config.option<ConfigOptionFloats>("machine_max_speed_x")->values; };
+
+    SECTION("a new extruder's pair is padded with the first value, like the other variant keys") {
+        config.option<ConfigOptionFloats>("machine_max_speed_x")->values = {500., 200.};
+        config.set_num_extruders(3);
+        REQUIRE(config.option<ConfigOptionStrings>("printer_extruder_variant")->size() == 3);
+        REQUIRE(speed_x() == std::vector<double>({500., 200., 500., 500., 500., 500.}));
+    }
+
+    SECTION("per-extruder pairs are kept, and removing an extruder removes its pair") {
+        config.option<ConfigOptionFloats>("machine_max_speed_x")->values = {500., 200., 400., 150., 300., 100.};
+        config.set_num_extruders(3);
+        REQUIRE(speed_x() == std::vector<double>({500., 200., 400., 150., 300., 100.}));
+        config.set_num_extruders(2);
+        REQUIRE(speed_x() == std::vector<double>({500., 200., 400., 150.}));
+    }
+
+    SECTION("a printer with nozzle variants gets a pair per variant") {
+        // 2 extruders x 2 variants each = 4 variants
+        config.option<ConfigOptionStrings>("extruder_variant_list", true)->values = {"Direct Drive Standard,Direct Drive High Flow",
+                                                                                     "Direct Drive Standard,Direct Drive High Flow"};
+        const std::vector<double> per_variant = {500., 200., 510., 210., 520., 220., 530., 230.};
+        config.option<ConfigOptionFloats>("machine_max_speed_x")->values = per_variant;
+        config.set_num_extruders(2);
+        REQUIRE(speed_x() == per_variant);
+
+        config.option<ConfigOptionFloats>("machine_max_speed_x")->values = {500., 200.};
+        config.set_num_extruders(2);
+        REQUIRE(speed_x() == std::vector<double>({500., 200., 500., 500., 500., 500., 500., 500.}));
+    }
+}
+
 // The device drying options hold several values per filament, as many as each filament preset gives.
 TEST_CASE("The device drying options are rebuilt as each filament's values in slot order", "[Config]")
 {

tests/slic3rutils/CMakeLists.txt

@@ -5,6 +5,7 @@ add_executable(${_TEST_NAME}_tests
     test_config_value_formatter.cpp
     test_creality_cfs_match.cpp
     test_dev_mapping.cpp
+    test_dev_extder_system.cpp
     test_filament_bitmap_utils.cpp
     test_device_progress.cpp
     test_device_manager_integration.cpp

tests/slic3rutils/test_dev_extder_system.cpp

@@ -0,0 +1,86 @@
+// Match the include environment that libslic3r_gui TUs get from pchheader.hpp: Windows.h with
+// WIN32_LEAN_AND_MEAN/NOMINMAX must come first so rpcndr.h's `byte` is processed before <cstddef>
+// makes std::byte a competing candidate (otherwise the Windows COM headers pulled in via
+// DeviceManager.hpp error with an ambiguous `byte`). wx/timer.h must precede DeviceManager.hpp,
+// which includes DeviceErrorDialog.hpp (uses wxTimerEvent) before its own wx/timer.h include.
+#include "catch2/catch_message.hpp"
+#include <string>
+#include <utility>
+#include <vector>
+#ifdef WIN32
+    #ifndef WIN32_LEAN_AND_MEAN
+        #define WIN32_LEAN_AND_MEAN
+    #endif
+    #ifndef NOMINMAX
+        #define NOMINMAX
+    #endif
+    #include <Windows.h>
+#endif
+
+#include <catch2/catch_test_macros.hpp>
+#include <catch2/catch_all.hpp>
+
+#include <wx/timer.h>
+
+#include "slic3r/GUI/DeviceManager.hpp"
+#include "slic3r/GUI/DeviceCore/DevExtruderSystem.h"
+
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+using namespace Slic3r;
+
+TEST_CASE("Extruder state decodes a generic toolhead set", "[DevExtderSystem]")
+{
+    MachineObject obj(nullptr, nullptr, "test", "test_dev", "127.0.0.1");
+
+    // device.extruder.state packing: count 0..3, current 4..7, target 8..11,
+    // switch 12..14, loading 15..18, busy 19.
+    const int extruder_count   = 4;
+    const int current_extruder = 2;
+    const int switch_state     = ES_BUSY;
+    const int loading_extruder = 1;
+    const int state = extruder_count | (current_extruder << 4) | (3 << 8) |
+                      (switch_state << 12) | (loading_extruder << 15) | (1 << 19);
+
+    json extruder = { {"state", state}, {"info", json::array()} };
+    for (int id = 0; id < extruder_count; ++id) {
+        // info: bit 1 has filament, bit 3 nozzle present.
+        // temp: current 0..15, target 16..31. spre/snow/star: slot 0..7, ams 8..15.
+        extruder["info"].push_back({
+            {"id", id},
+            {"filam_bak", json::array({id})},
+            {"info", (id % 2 == 0 ? 2 : 0) | 8},
+            {"temp", (200 + id) | ((250 + id) << 16)},
+            {"spre", 10 << 8},
+            {"snow", id | ((20 + id) << 8)},
+            {"star", 30 << 8},
+            {"stat", 0},
+            {"hnow", id},
+        });
+    }
+
+    ExtderSystemParser::ParseV2_0(extruder, obj.GetExtderSystem());
+
+    REQUIRE(obj.GetExtderSystem()->GetTotalExtderCount() == extruder_count);
+    CHECK(obj.GetExtderSystem()->GetCurrentExtderId() == current_extruder);
+    CHECK(static_cast<int>(obj.GetExtderSystem()->GetSwitchState()) == switch_state);
+    CHECK(obj.GetExtderSystem()->GetLoadingExtderId() == loading_extruder);
+    CHECK(obj.GetExtderSystem()->IsBusyLoading());
+
+    for (int id = 0; id < extruder_count; ++id) {
+        const auto ext = obj.GetExtderSystem()->GetExtderById(id);
+        REQUIRE(ext.has_value());
+        INFO("extruder " << id);
+        CHECK(ext->GetExtId() == id);
+        CHECK(ext->GetCurrentTemp() == 200 + id);
+        CHECK(ext->GetTargetTemp() == 250 + id);
+        CHECK(ext->HasFilamentInExt() == (id % 2 == 0));
+        CHECK(ext->GetFilamBackup() == std::vector<int>{id});
+        CHECK(ext->GetSlotPre().ams_id == "10");
+        CHECK(ext->GetSlotNow().ams_id == std::to_string(20 + id));
+        CHECK(ext->GetSlotNow().slot_id == std::to_string(id));
+        CHECK(ext->GetSlotTarget().ams_id == "30");
+        CHECK(ext->GetNozzleId() == id);
+    }
+}

tests/slic3rutils/test_dev_mapping.cpp

@@ -3,6 +3,8 @@
 // makes std::byte a competing candidate (otherwise the Windows COM headers pulled in via
 // DeviceManager.hpp error with an ambiguous `byte`). wx/timer.h must precede DeviceManager.hpp,
 // which includes DeviceErrorDialog.hpp (uses wxTimerEvent) before its own wx/timer.h include.
+#include <string>
+#include <utility>
 #ifdef WIN32
     #ifndef WIN32_LEAN_AND_MEAN
         #define WIN32_LEAN_AND_MEAN
@@ -17,6 +19,7 @@
 #include "slic3r/GUI/DeviceCore/DevDefs.h"
 #include "libslic3r/ProjectTask.hpp"
 #include <vector>
+#include <set>
 #include <catch2/catch_message.hpp>
 
 #include <catch2/catch_all.hpp>
@@ -65,6 +68,162 @@ TEST_CASE("AMS tray placeholder state follows the latest status", "[DevFilaSyste
     CHECK_FALSE(tray->is_slot_placeholder);
 }
 
+TEST_CASE("Agent filament slots preserve every extruder and AMS binding", "[DevFilaSystem]")
+{
+    MachineObject obj(nullptr, nullptr, "test", "test_dev", "127.0.0.1");
+
+    const json filament = json::parse(R"({
+        "units": [
+            { "id": "0", "extruder": 0, "slots": [
+                { "index": 0, "loaded": true, "material": "PLA", "color": "FF5733FF" },
+                { "index": 1, "loaded": true, "material": "PLA", "color": "33C1FFFF" },
+                { "index": 2, "loaded": true, "material": "PLA", "color": "8D33FFFF" },
+                { "index": 3, "loaded": false, "material": "",    "color": "00000000" }
+            ] },
+            { "id": "1", "extruder": 1, "slots": [
+                { "index": 0, "loaded": true, "material": "ASA", "color": "33C1FFFF" },
+                { "index": 1, "loaded": true, "material": "ASA", "color": "8D33FFFF" },
+                { "index": 2, "loaded": true, "material": "ASA", "color": "FF5733FF" },
+                { "index": 3, "loaded": false, "material": "",    "color": "00000000" }
+            ] },
+            { "id": "2", "extruder": 2, "slots": [
+                { "index": 0, "loaded": true, "material": "ABS", "color": "8D33FFFF" },
+                { "index": 1, "loaded": true, "material": "ABS", "color": "FF5733FF" },
+                { "index": 2, "loaded": true, "material": "ABS", "color": "33C1FFFF" },
+                { "index": 3, "loaded": false, "material": "",    "color": "00000000" }
+            ] },
+            { "id": "3", "extruder": 3, "slots": [
+                { "index": 0, "loaded": true, "material": "PETG", "color": "FF5733FF" },
+                { "index": 1, "loaded": true, "material": "PETG", "color": "33C1FFFF" },
+                { "index": 2, "loaded": true, "material": "PETG", "color": "8D33FFFF" },
+                { "index": 3, "loaded": false, "material": "",    "color": "00000000" }
+            ] }
+        ],
+        "external": [
+            { "extruder": 3, "loaded": true, "material": "PETG", "preset_id": "P3" },
+            { "extruder": 0, "loaded": true, "material": "PLA",  "preset_id": "P0" },
+            { "extruder": 2, "loaded": false, "material": "ABS", "preset_id": "P2" },
+            { "extruder": 1, "loaded": true, "material": "ASA",  "preset_id": "P1" }
+        ]
+    })");
+
+    DevFilaSystemParser::ParseAgentFilament(filament, &obj, obj.GetFilaSystem().get());
+
+    REQUIRE(obj.vt_slot.size() == 4);
+    CHECK(obj.vt_slot[0].id == "255");
+    CHECK(obj.vt_slot[1].id == "254");
+    CHECK(obj.vt_slot[2].id == "253");
+    CHECK(obj.vt_slot[3].id == "252");
+    CHECK(obj.vt_slot[0].setting_id == "P0");
+    CHECK(obj.vt_slot[1].setting_id == "P1");
+    CHECK(obj.vt_slot[2].setting_id == "P2");
+    CHECK(obj.vt_slot[3].setting_id == "P3");
+
+    REQUIRE(obj.GetFilaSystem()->GetAmsCount() == 4);
+    for (int extruder = 0; extruder < 4; ++extruder) {
+        const auto& ams = obj.GetFilaSystem()->GetAmsList().at(std::to_string(extruder));
+        CHECK(ams->GetExtruderId() == extruder);
+        CHECK(ams->GetBindedExtruderSet() == std::set<int>{extruder});
+        REQUIRE(ams->GetTrays().size() == 4);
+        CHECK(ams->GetTrays().at("0")->color != ams->GetTrays().at("1")->color);
+        CHECK(ams->GetTrays().at("1")->color != ams->GetTrays().at("2")->color);
+        CHECK_FALSE(ams->GetTrays().at("3")->is_exists);
+    }
+
+    CHECK(obj.contains_tray("253", "0"));
+    CHECK(obj.get_tray("253", "0").setting_id == "P2");
+    CHECK(obj.GetFilaSystem()->GetExtruderIdByAmsId("253") == 2);
+
+    const auto tray_index_map = obj.GetFilaSystem()->GetTrayIndexMap();
+    REQUIRE(tray_index_map.count(252) == 1);
+    CHECK(tray_index_map.at(252).first == 252);
+    CHECK(tray_index_map.at(252).second == 0);
+}
+
+TEST_CASE("Generic AMS tray index map uses cumulative lane counts", "[DevMapping]")
+{
+    MachineObject obj(nullptr, nullptr, "test", "test_dev", "127.0.0.1");
+
+    // A well-formed generic payload pairs "units" with "external". An empty external array resets
+    // vt_slot, clearing the default virtual tray (255) MachineObject's constructor seeds; otherwise
+    // that phantom external tray lands in GetTrayIndexMap and inflates the map size.
+    json filament = { {"units", json::array()}, {"external", json::array()} };
+    for (int ams_id = 0; ams_id < 2; ++ams_id) {
+        json unit = {
+            {"id", std::to_string(ams_id)},
+            {"extruder", ams_id},
+            {"slots", json::array()}
+        };
+        for (int slot_id = 0; slot_id < 5; ++slot_id)
+            unit["slots"].push_back({{"index", slot_id}, {"loaded", false}});
+        filament["units"].push_back(std::move(unit));
+    }
+
+    DevFilaSystemParser::ParseAgentFilament(filament, &obj, obj.GetFilaSystem().get());
+
+    const auto tray_index_map = obj.GetFilaSystem()->GetTrayIndexMap();
+    REQUIRE(tray_index_map.size() == 10);
+    CHECK(tray_index_map.at(0).first == 0);
+    CHECK(tray_index_map.at(0).second == 0);
+    CHECK(tray_index_map.at(4).first == 0);
+    CHECK(tray_index_map.at(4).second == 4);
+    CHECK(tray_index_map.at(5).first == 1);
+    CHECK(tray_index_map.at(5).second == 0);
+    CHECK(tray_index_map.at(9).first == 1);
+    CHECK(tray_index_map.at(9).second == 4);
+}
+
+TEST_CASE("Generic tray index map handles unequal per-unit slot counts", "[DevMapping]")
+{
+    MachineObject obj(nullptr, nullptr, "test", "test_dev", "127.0.0.1");
+
+    // An "external" array must accompany "units" so vt_slot is reset (see the cumulative test above).
+    json filament = { {"units", json::array()}, {"external", json::array()} };
+    const std::vector<int> slot_counts = {4, 12};
+    for (int ams_id = 0; ams_id < static_cast<int>(slot_counts.size()); ++ams_id) {
+        json unit = { {"id", std::to_string(ams_id)}, {"extruder", ams_id}, {"slots", json::array()} };
+        for (int slot_id = 0; slot_id < slot_counts[ams_id]; ++slot_id)
+            unit["slots"].push_back({{"index", slot_id}, {"loaded", false}});
+        filament["units"].push_back(std::move(unit));
+    }
+
+    DevFilaSystemParser::ParseAgentFilament(filament, &obj, obj.GetFilaSystem().get());
+
+    const auto tray_index_map = obj.GetFilaSystem()->GetTrayIndexMap();
+    REQUIRE(tray_index_map.size() == 16);
+    // Unit 0 occupies global lanes 0..3; unit 1 continues at 4..15 because the counter advances
+    // by the reported tray count, not by a fixed four-slot stride.
+    CHECK(tray_index_map.at(0).first == 0);
+    CHECK(tray_index_map.at(0).second == 0);
+    CHECK(tray_index_map.at(3).first == 0);
+    CHECK(tray_index_map.at(3).second == 3);
+    CHECK(tray_index_map.at(4).first == 1);
+    CHECK(tray_index_map.at(4).second == 0);
+    CHECK(tray_index_map.at(15).first == 1);
+    CHECK(tray_index_map.at(15).second == 11);
+}
+
+TEST_CASE("A generic AMS unit reports its reported tray count", "[DevFilaSystem]")
+{
+    MachineObject obj(nullptr, nullptr, "test", "test_dev", "127.0.0.1");
+
+    json filament = { {"units", json::array()}, {"external", json::array()} };
+    const std::vector<int> slot_counts = {8, 1};
+    for (int ams_id = 0; ams_id < static_cast<int>(slot_counts.size()); ++ams_id) {
+        json unit = { {"id", std::to_string(ams_id)}, {"extruder", ams_id}, {"slots", json::array()} };
+        for (int slot_id = 0; slot_id < slot_counts[ams_id]; ++slot_id)
+            unit["slots"].push_back({{"index", slot_id}, {"loaded", false}});
+        filament["units"].push_back(std::move(unit));
+    }
+
+    DevFilaSystemParser::ParseAgentFilament(filament, &obj, obj.GetFilaSystem().get());
+
+    // Non-Bambu units are not capped at the four-slot Bambu contract; the reported tray count wins.
+    const auto& ams_list = obj.GetFilaSystem()->GetAmsList();
+    REQUIRE(ams_list.at("0")->GetSlotCount() == 8);
+    REQUIRE(ams_list.at("1")->GetSlotCount() == 1);
+}
+
 TEST_CASE("Switch-bound AMS trays map to the left extruder", "[DevMapping]")
 {
     MachineObject obj(nullptr, nullptr, "test", "test_dev", "127.0.0.1");