fix+feat: Snapmaker U1 — 5 bug fixes and 0.6mm / mixed-nozzle profiles (#12244 #12390 #12652 #12073 #12797 #11424) (#12824)

.github/workflows/build_all.yml

@@ -160,6 +160,7 @@ jobs:
             runner: ubuntu-24.04-arm
     # Don't run scheduled builds on forks; skip entirely on self-hosted runners
     if: ${{ !cancelled() && !vars.SELF_HOSTED && (github.event_name != 'schedule' || github.repository == 'OrcaSlicer/OrcaSlicer') }}
+
     runs-on: ${{ matrix.variant.runner }}
     env:
       date:

resources/profiles/Snapmaker.json

@@ -454,6 +454,26 @@
             "name": "0.28 Extra Draft @Snapmaker U1 (0.4 nozzle)",
             "sub_path": "process/0.28 Extra Draft @Snapmaker U1 (0.4 nozzle).json"
         },
+        {
+            "name": "fdm_process_U1_0.6_common",
+            "sub_path": "process/fdm_process_U1_0.6_common.json"
+        },
+        {
+            "name": "0.20 Standard @Snapmaker U1 (0.6 nozzle)",
+            "sub_path": "process/0.20 Standard @Snapmaker U1 (0.6 nozzle).json"
+        },
+        {
+            "name": "0.30 Draft @Snapmaker U1 (0.6 nozzle)",
+            "sub_path": "process/0.30 Draft @Snapmaker U1 (0.6 nozzle).json"
+        },
+        {
+            "name": "0.40 Extra Draft @Snapmaker U1 (0.6 nozzle)",
+            "sub_path": "process/0.40 Extra Draft @Snapmaker U1 (0.6 nozzle).json"
+        },
+        {
+            "name": "0.20 Standard @Snapmaker U1 (0.4+0.6 nozzle)",
+            "sub_path": "process/0.20 Standard @Snapmaker U1 (0.4+0.6 nozzle).json"
+        },
         {
             "name": "0.06 Standard @Snapmaker Artisan (0.2 nozzle)",
             "sub_path": "process/0.06 Standard @Snapmaker Artisan (0.2 nozzle).json"
@@ -1530,6 +1550,14 @@
             "name": "Snapmaker U1 (0.4 nozzle)",
             "sub_path": "machine/Snapmaker U1 (0.4 nozzle).json"
         },
+        {
+            "name": "Snapmaker U1 (0.6 nozzle)",
+            "sub_path": "machine/Snapmaker U1 (0.6 nozzle).json"
+        },
+        {
+            "name": "Snapmaker U1 (0.4+0.6 nozzle)",
+            "sub_path": "machine/Snapmaker U1 (0.4+0.6 nozzle).json"
+        },
         {
             "name": "Snapmaker A250 BKit (0.2 nozzle)",
             "sub_path": "machine/Snapmaker A250 BKit (0.2 nozzle).json"

resources/profiles/Snapmaker/machine/Snapmaker U1 (0.4 nozzle).json

@@ -29,6 +29,38 @@
         "0"
     ],
     "machine_end_gcode": " PRINT_END\nTIMELAPSE_STOP",
+    "machine_max_acceleration_extruding": [
+        "25000",
+        "25000"
+    ],
+    "machine_max_acceleration_retracting": [
+        "5000",
+        "5000"
+    ],
+    "machine_max_acceleration_travel": [
+        "25000",
+        "25000"
+    ],
+    "machine_max_acceleration_x": [
+        "25000",
+        "25000"
+    ],
+    "machine_max_acceleration_y": [
+        "25000",
+        "25000"
+    ],
+    "machine_max_acceleration_z": [
+        "500",
+        "200"
+    ],
+    "machine_max_jerk_x": [
+        "9",
+        "9"
+    ],
+    "machine_max_jerk_y": [
+        "9",
+        "9"
+    ],
     "machine_max_jerk_z": [
         "3",
         "0.4"
@@ -37,10 +69,21 @@
         "30",
         "25"
     ],
+    "machine_max_speed_x": [
+        "1000",
+        "200"
+    ],
+    "machine_max_speed_y": [
+        "1000",
+        "200"
+    ],
     "machine_max_speed_z": [
         "20",
         "12"
     ],
+    "resonance_avoidance": "1",
+    "min_resonance_avoidance_speed": "40",
+    "max_resonance_avoidance_speed": "90",
     "machine_start_gcode": "SET_PRINT_AUTO_BED_LEVELING ENABLE=1\nSET_TIME_LAPSE_CAMERA ENABLE=1\n;===== date: 20251222 =====================\n\nPRINT_START\nDEFECT_DETECTION_START\nSET_PRINT_STATS_INFO TOTAL_LAYER={total_layer_count}\nSET_PRINT_STATS_INFO CURRENT_LAYER=0\nTIMELAPSE_START\nM140 S{bed_temperature_initial_layer_single}\nM104 T{initial_extruder} S140\nM204 S10000\n\nG28 X Y\n;===== 床面异物检测 ========\nT{initial_extruder}\nG90\nDEFECT_DETECTION_DETECT_BED\n;===== 取放头检测 =================\nSM_PRINT_CHECK_SWITCH_EXTRUDER\n\n;===== 自动进料 & 挤出流量 & 预挤出 ======================\nSM_PRINT_EXTRUDER_PREHEAT EXTRUDER=1 TEMP=140\nSM_PRINT_AUTO_FEED EXTRUDER=0\nSM_PRINT_FLOW_CALIBRATE EXTRUDER=0\nSM_PRINT_EXTRUDER_PREHEAT EXTRUDER=2 TEMP=140\nSM_PRINT_AUTO_FEED EXTRUDER=1\nSM_PRINT_FLOW_CALIBRATE EXTRUDER=1\nSM_PRINT_EXTRUDER_PREHEAT EXTRUDER=3 TEMP=140\nSM_PRINT_AUTO_FEED EXTRUDER=2\nSM_PRINT_FLOW_CALIBRATE EXTRUDER=2\nSM_PRINT_AUTO_FEED EXTRUDER=3\nSM_PRINT_FLOW_CALIBRATE EXTRUDER=3\nM104 S0 T0 A0\nM104 S0 T1 A0\nM104 S0 T2 A0\nM104 S0 T3 A0\nM104 T{initial_extruder} S{nozzle_temperature[initial_extruder] - 90}\n\n;===== 粗回零 =================\nT{initial_extruder}\nM106 S255\nM106 P2 S0\nMOVE_TO_DISCARD_FILAMENT_POSITION\nM109 T{initial_extruder} S{nozzle_temperature[initial_extruder] - 90}\nROUGHLY_CLEAN_NOZZLE_WITH_DISCARD\nMOVE_TO_XY_IDLE_POSITION_EXTRUDER\nG28 Z I140 J140\n\n;===== 检测钢板 =================\nDETECT_BED_PLATE\n\n;===== 深度清洁喷嘴 =================\nG90\nG0 Z5 F10000\nMOVE_TO_DISCARD_FILAMENT_POSITION\nM109 S{nozzle_temperature[initial_extruder] - 50}\nROUGHLY_CLEAN_NOZZLE\nMOVE_TO_XY_IDLE_POSITION_EXTRUDER\nFINELY_CLEAN_NOZZLE_STAGE_1\nM104 S{nozzle_temperature[initial_extruder] - 90}\nG0 Z5 F10000\nMOVE_TO_DISCARD_FILAMENT_POSITION\nROUGHLY_CLEAN_NOZZLE\nMOVE_TO_XY_IDLE_POSITION_EXTRUDER\nFINELY_CLEAN_NOZZLE_STAGE_2\n\n;===== 精回零 =================\nM106 S255\nM109 S{nozzle_temperature[initial_extruder] - 90}\nM190 S{bed_temperature_initial_layer_single}\nM107 P2\nG90\nG0 Z5 F10000\nG28 Z\n\n;===== 热床调平 =================\n; Always pass `ADAPTIVE_MARGIN=0` because Orca has already handled `adaptive_bed_mesh_margin` internally\n; Make sure to set ADAPTIVE to 0 otherwise Klipper will use it's own adaptive bed mesh logic\nBED_MESH_CALIBRATE mesh_min={adaptive_bed_mesh_min[0]},{adaptive_bed_mesh_min[1]} mesh_max={adaptive_bed_mesh_max[0]},{adaptive_bed_mesh_max[1]} ALGORITHM=[bed_mesh_algo] PROBE_COUNT={bed_mesh_probe_count[0]},{bed_mesh_probe_count[1]} ADAPTIVE=0 ADAPTIVE_MARGIN=0\n; Original upstream: BED_MESH_CALIBRATE PROBE_COUNT=11,11\n\n;===== 画起始线 =================\nG90\nG1 Z1.5\nG0 X10 Y3 Z2 F18000\nM109 S{nozzle_temperature_initial_layer[initial_extruder]}\nG1 Z0.2\nM83\nG1 X110 E15 F360\nG1 Z1.5\n\nG90\nM106 S0",
     "machine_tool_change_time": "5",
     "max_layer_height": [
@@ -180,8 +223,9 @@
         "Auto Lift"
     ],
     "enable_filament_ramming": "0",
-    "extruder_clearance_height_to_rod": "27.5",
-    "extruder_clearance_radius": "72.5",
+    "extruder_clearance_height_to_rod": "60",
+    "extruder_clearance_height_to_lid": "130",
+    "extruder_clearance_radius": "80",
     "machine_load_filament_time": "0",
     "machine_unload_filament_time": "0",
     "before_layer_change_gcode": ";BEFORE_LAYER_CHANGE\n;[layer_z]\nG92 E0\nTIMELAPSE_TAKE_FRAME\nDEFECT_DETECTION_DETECT",

resources/profiles/Snapmaker/machine/Snapmaker U1 (0.4+0.6 nozzle).json

@@ -0,0 +1,30 @@
+{
+    "type": "machine",
+    "setting_id": "SM_U1_04_06",
+    "name": "Snapmaker U1 (0.4+0.6 nozzle)",
+    "from": "system",
+    "instantiation": "true",
+    "inherits": "fdm_U1",
+    "printer_model": "Snapmaker U1",
+    "printer_variant": "0.4+0.6",
+    "default_print_profile": "0.20 Standard @Snapmaker U1 (0.4+0.6 nozzle)",
+    "max_layer_height": [
+        "0.32",
+        "0.32",
+        "0.48",
+        "0.48"
+    ],
+    "min_layer_height": [
+        "0.08",
+        "0.08",
+        "0.12",
+        "0.12"
+    ],
+    "nozzle_diameter": [
+        "0.4",
+        "0.4",
+        "0.6",
+        "0.6"
+    ],
+    "nozzle_type": "stainless_steel"
+}

resources/profiles/Snapmaker/machine/Snapmaker U1 (0.6 nozzle).json

@@ -0,0 +1,30 @@
+{
+    "type": "machine",
+    "setting_id": "SM_U1_06",
+    "name": "Snapmaker U1 (0.6 nozzle)",
+    "from": "system",
+    "instantiation": "true",
+    "inherits": "fdm_U1",
+    "printer_model": "Snapmaker U1",
+    "printer_variant": "0.6",
+    "default_print_profile": "0.20 Standard @Snapmaker U1 (0.6 nozzle)",
+    "max_layer_height": [
+        "0.48",
+        "0.48",
+        "0.48",
+        "0.48"
+    ],
+    "min_layer_height": [
+        "0.12",
+        "0.12",
+        "0.12",
+        "0.12"
+    ],
+    "nozzle_diameter": [
+        "0.6",
+        "0.6",
+        "0.6",
+        "0.6"
+    ],
+    "nozzle_type": "stainless_steel"
+}

resources/profiles/Snapmaker/machine/Snapmaker U1.json

@@ -7,5 +7,5 @@
     "model_id": "797581801",
     "bed_model": "Snapmaker U1_bed.stl",
     "bed_texture": "Snapmaker U1_texture.svg",
-    "nozzle_diameter": "0.4"
-}
+    "nozzle_diameter": "0.4;0.4+0.6;0.6"
+}

resources/profiles/Snapmaker/process/0.20 Standard @Snapmaker U1 (0.4+0.6 nozzle).json

@@ -0,0 +1,32 @@
+{
+    "type": "process",
+    "name": "0.20 Standard @Snapmaker U1 (0.4+0.6 nozzle)",
+    "inherits": "fdm_process_U1_0.20",
+    "from": "system",
+    "setting_id": "GP004_0406_020",
+    "instantiation": "true",
+    "description": "Standard profile for the Snapmaker U1 mixed-nozzle configuration (T0/T1 = 0.4 mm, T2/T3 = 0.6 mm). Line widths are expressed as percentages of nozzle diameter so they scale correctly per tool. Use T0/T1 for detail work and outer walls; use T2/T3 for fast infill or large structural features.",
+    "compatible_printers": [
+        "Snapmaker U1 (0.4+0.6 nozzle)"
+    ],
+    "line_width": "105%",
+    "outer_wall_line_width": "105%",
+    "inner_wall_line_width": "112%",
+    "initial_layer_line_width": "125%",
+    "sparse_infill_line_width": "105%",
+    "internal_solid_infill_line_width": "105%",
+    "support_line_width": "105%",
+    "top_surface_line_width": "105%",
+    "smooth_coefficient": "150",
+    "overhang_totally_speed": "50",
+    "ooze_prevention": "1",
+    "slowdown_for_curled_perimeters": "0",
+    "standby_temperature_delta": "-150",
+    "wipe_tower_filament": "0",
+    "preheat_time": "30",
+    "wipe_tower_cone_angle": "15",
+    "prime_tower_brim_width": "5",
+    "initial_layer_print_height": "0.25",
+    "top_shell_layers": "5",
+    "bottom_shell_layers": "3"
+}

resources/profiles/Snapmaker/process/0.20 Standard @Snapmaker U1 (0.6 nozzle).json

@@ -0,0 +1,25 @@
+{
+    "type": "process",
+    "name": "0.20 Standard @Snapmaker U1 (0.6 nozzle)",
+    "inherits": "fdm_process_U1_0.6_common",
+    "from": "system",
+    "setting_id": "GP004_06_020",
+    "instantiation": "true",
+    "description": "Standard 0.2 mm layer height profile for the Snapmaker U1 with 0.6 mm nozzles. Balances print speed and surface quality for everyday prints.",
+    "layer_height": "0.20",
+    "smooth_coefficient": "150",
+    "overhang_totally_speed": "50",
+    "compatible_printers": [
+        "Snapmaker U1 (0.6 nozzle)"
+    ],
+    "ooze_prevention": "1",
+    "slowdown_for_curled_perimeters": "0",
+    "standby_temperature_delta": "-150",
+    "wipe_tower_filament": "0",
+    "preheat_time": "30",
+    "wipe_tower_cone_angle": "15",
+    "prime_tower_brim_width": "5",
+    "initial_layer_print_height": "0.25",
+    "top_shell_layers": "4",
+    "bottom_shell_layers": "3"
+}

resources/profiles/Snapmaker/process/0.30 Draft @Snapmaker U1 (0.6 nozzle).json

@@ -0,0 +1,29 @@
+{
+    "type": "process",
+    "name": "0.30 Draft @Snapmaker U1 (0.6 nozzle)",
+    "inherits": "fdm_process_U1_0.6_common",
+    "from": "system",
+    "setting_id": "GP004_06_030",
+    "instantiation": "true",
+    "description": "Fast draft profile for the Snapmaker U1 with 0.6 mm nozzles. 0.3 mm layer height for quick prototypes and functional parts.",
+    "layer_height": "0.30",
+    "smooth_coefficient": "80",
+    "overhang_totally_speed": "40",
+    "compatible_printers": [
+        "Snapmaker U1 (0.6 nozzle)"
+    ],
+    "ooze_prevention": "1",
+    "slowdown_for_curled_perimeters": "0",
+    "standby_temperature_delta": "-150",
+    "wipe_tower_filament": "0",
+    "preheat_time": "30",
+    "wipe_tower_cone_angle": "15",
+    "prime_tower_brim_width": "5",
+    "initial_layer_print_height": "0.30",
+    "top_shell_layers": "3",
+    "bottom_shell_layers": "3",
+    "outer_wall_speed": "220",
+    "inner_wall_speed": "330",
+    "sparse_infill_speed": "300",
+    "internal_solid_infill_speed": "280"
+}

resources/profiles/Snapmaker/process/0.40 Extra Draft @Snapmaker U1 (0.6 nozzle).json

@@ -0,0 +1,30 @@
+{
+    "type": "process",
+    "name": "0.40 Extra Draft @Snapmaker U1 (0.6 nozzle)",
+    "inherits": "fdm_process_U1_0.6_common",
+    "from": "system",
+    "setting_id": "GP004_06_040",
+    "instantiation": "true",
+    "description": "Maximum-speed profile for the Snapmaker U1 with 0.6 mm nozzles. 0.4 mm layer height for rapid prototyping where surface finish is not critical.",
+    "layer_height": "0.40",
+    "smooth_coefficient": "80",
+    "overhang_totally_speed": "30",
+    "compatible_printers": [
+        "Snapmaker U1 (0.6 nozzle)"
+    ],
+    "ooze_prevention": "1",
+    "slowdown_for_curled_perimeters": "0",
+    "standby_temperature_delta": "-150",
+    "wipe_tower_filament": "0",
+    "preheat_time": "30",
+    "wipe_tower_cone_angle": "15",
+    "prime_tower_brim_width": "5",
+    "initial_layer_print_height": "0.35",
+    "top_shell_layers": "3",
+    "bottom_shell_layers": "3",
+    "outer_wall_speed": "220",
+    "inner_wall_speed": "330",
+    "sparse_infill_speed": "320",
+    "internal_solid_infill_speed": "300",
+    "wall_loops": "2"
+}

resources/profiles/Snapmaker/process/fdm_process_U1_0.6_common.json

@@ -0,0 +1,16 @@
+{
+    "type": "process",
+    "name": "fdm_process_U1_0.6_common",
+    "inherits": "fdm_process_U1_common",
+    "from": "system",
+    "instantiation": "false",
+    "line_width": "0.62",
+    "outer_wall_line_width": "0.62",
+    "inner_wall_line_width": "0.62",
+    "initial_layer_line_width": "0.72",
+    "sparse_infill_line_width": "0.62",
+    "internal_solid_infill_line_width": "0.62",
+    "support_line_width": "0.62",
+    "top_surface_line_width": "0.62",
+    "compatible_printers": []
+}

src/libslic3r/GCodeWriter.cpp

@@ -30,7 +30,21 @@ void GCodeWriter::apply_print_config(const PrintConfig &print_config)
     m_single_extruder_multi_material = print_config.single_extruder_multi_material.value;
     bool use_mach_limits = print_config.gcode_flavor.value == gcfMarlinLegacy || print_config.gcode_flavor.value == gcfMarlinFirmware ||
                            print_config.gcode_flavor.value == gcfKlipper || print_config.gcode_flavor.value == gcfRepRapFirmware;
-    m_max_acceleration = std::lrint(use_mach_limits ? print_config.machine_max_acceleration_extruding.values.front() : 0);
+    if (use_mach_limits) {
+        // For Klipper, SET_VELOCITY_LIMIT ACCEL= applies to all moves, so the effective cap
+        // is the minimum of the extruding limit and the per-axis X/Y limits.
+        // This ensures user-configured Motion Ability limits are honoured (#12244).
+        unsigned int extruding_limit = std::lrint(print_config.machine_max_acceleration_extruding.values.front());
+        if (print_config.gcode_flavor.value == gcfKlipper) {
+            unsigned int x_limit = std::lrint(print_config.machine_max_acceleration_x.values.front());
+            unsigned int y_limit = std::lrint(print_config.machine_max_acceleration_y.values.front());
+            if (x_limit > 0) extruding_limit = std::min(extruding_limit, x_limit);
+            if (y_limit > 0) extruding_limit = std::min(extruding_limit, y_limit);
+        }
+        m_max_acceleration = extruding_limit;
+    } else {
+        m_max_acceleration = 0;
+    }
     m_max_travel_acceleration = static_cast<unsigned int>(
         std::round((use_mach_limits && supports_separate_travel_acceleration(print_config.gcode_flavor.value)) ?
                        print_config.machine_max_acceleration_travel.values.front() :

src/slic3r/GUI/FilamentMapDialog.cpp

@@ -46,6 +46,14 @@ bool try_pop_up_before_slice(bool is_slice_all, Plater* plater_ref, PartPlate* p
     if (nozzle_diameters->size() <= 1)
         return true;
 
+    // The filament-grouping dialog is specifically designed for BBL dual-nozzle printers
+    // (e.g. H2D) where filaments must be assigned to a left or right nozzle.
+    // For toolchangers (≥3 tools) and all non-BBL printers the dialog is irrelevant and
+    // confusing; skip it entirely so slicing proceeds without interruption. (#12390)
+    PresetBundle* preset = wxGetApp().preset_bundle;
+    if (!preset || !preset->is_bbl_vendor() || nozzle_diameters->size() != 2)
+        return true;
+
     bool sync_plate = true;
 
     std::vector<std::string> filament_colors = full_config.option<ConfigOptionStrings>("filament_colour")->values;

src/slic3r/GUI/GLCanvas3D.cpp

@@ -9714,7 +9714,9 @@ void GLCanvas3D::_set_warning_notification(EWarning warning, bool state)
                         wxString    region = L"en";
                         if (language.find("zh") == 0)
                         	region = L"zh";
-                        wxGetApp().open_browser_with_warning_dialog(wxString::Format(L"https://wiki.bambulab.com/%s/filament-acc/filament/h2d-pla-and-petg-mutual-support", region));
+                        // Use the generic dual-nozzle PLA+PETG guide rather than the H2D-specific page
+                        // so the link is relevant for all dual-extrusion printers, not just Bambu H2D. (#12073)
+                        wxGetApp().open_browser_with_warning_dialog(wxString::Format(L"https://wiki.bambulab.com/%s/filament-acc/filament/pla-and-petg-dual-extrusion", region));
                         return false;
                     });
             }

src/slic3r/GUI/PartPlate.cpp

@@ -1871,26 +1871,59 @@ bool PartPlate::check_mixture_of_pla_and_petg(const DynamicPrintConfig &config)
     bool has_pla = false;
     bool has_petg = false;
 
-    std::vector<int> used_filaments = get_extruders(true); // 1 base
+    // On a toolchanger (machine_tool_change_time > 0) each filament slot maps to a
+    // separate physical nozzle: only one nozzle is ever mounted or heated at a time, so
+    // there is no cross-nozzle contamination between PLA and PETG.  Track which physical
+    // nozzle each material is on; warn only when PLA and PETG would pass through the
+    // *same* nozzle.
+    //
+    // NOTE: if MMU-on-toolchanger support is added (#10586), the nozzle-mapping logic
+    // will need to be revisited because multiple filaments may then share one tool slot.
+    bool is_toolchanger = false;
+    auto *tool_change_time = config.option<ConfigOptionFloat>("machine_tool_change_time");
+    if (tool_change_time && tool_change_time->value > 0)
+        is_toolchanger = true;
+
+    // nozzle index → whether it carries PLA / PETG
+    std::map<int, bool> nozzle_has_pla;
+    std::map<int, bool> nozzle_has_petg;
+
+    std::vector<int> used_filaments = get_extruders(true); // 1-based
     if (!used_filaments.empty()) {
+        const auto *filament_types = config.option<ConfigOptionStrings>("filament_type");
         for (auto filament_idx : used_filaments) {
-            int                 filament_id        = filament_idx - 1;
-            if (filament_id < config.option<ConfigOptionStrings>("filament_type")->values.size()) {
-                std::string filament_type = config.option<ConfigOptionStrings>("filament_type")->values.at(filament_id);
-                if (filament_type == "PLA")
+            int filament_id = filament_idx - 1;
+            if (filament_id < (int)filament_types->values.size()) {
+                const std::string &filament_type = filament_types->values[filament_id];
+                if (filament_type == "PLA") {
                     has_pla = true;
-                if (filament_type == "PETG")
+                    nozzle_has_pla[filament_id] = true;
+                }
+                if (filament_type == "PETG") {
                     has_petg = true;
+                    nozzle_has_petg[filament_id] = true;
+                }
             } else {
                 BOOST_LOG_TRIVIAL(info) << __FUNCTION__ << " check error:array bound";
             }
         }
     }
 
-    if (has_pla && has_petg)
-        return false;
+    if (!has_pla || !has_petg)
+        return true; // no mixture — no warning
 
-    return true;
+    if (is_toolchanger) {
+        // Warn only if any single nozzle slot carries both PLA and PETG (e.g. future MMU
+        // on toolchanger).  On a pure toolchanger each slot is independent, so this loop
+        // will never fire and the warning is correctly suppressed. (#12073)
+        for (const auto &kv : nozzle_has_pla) {
+            if (nozzle_has_petg.count(kv.first))
+                return false; // same nozzle → warn
+        }
+        return true; // different nozzles → safe, no warning
+    }
+
+    return false; // non-toolchanger with both PLA and PETG → warn
 }
 
 bool PartPlate::check_mixture_filament_compatible(const DynamicPrintConfig &config, std::string &error_msg)