Add toolchange ordering option (Standard/Cyclic). (#13582)

src/libslic3r/GCode/ToolOrdering.cpp

@@ -187,6 +187,10 @@ static void apply_first_layer_order(const DynamicPrintConfig* config, std::vecto
 
 void ToolOrdering::handle_dontcare_extruder(const std::vector<unsigned int>& tool_order_layer0)
 {
+    const PrintConfig* print_config = m_print_config_ptr;
+    if (!print_config && m_print_object_ptr)
+        print_config = &m_print_object_ptr->print()->config();
+
     if(m_layer_tools.empty() || tool_order_layer0.empty())
         return;
 
@@ -221,6 +225,8 @@ void ToolOrdering::handle_dontcare_extruder(const std::vector<unsigned int>& too
     for (int i = 1; i < m_layer_tools.size(); i++) {
         LayerTools& lt = m_layer_tools[i];
 
+        // Extruders in lt.extruders are already sorted.
+
         if (lt.extruders.empty())
             continue;
         if (lt.extruders.size() == 1 && lt.extruders.front() == 0)
@@ -229,14 +235,23 @@ void ToolOrdering::handle_dontcare_extruder(const std::vector<unsigned int>& too
             if (lt.extruders.front() == 0)
                 // Pop the "don't care" extruder, the "don't care" region will be merged with the next one.
                 lt.extruders.erase(lt.extruders.begin());
-            // Reorder the extruders to start with the last one.
-            for (size_t i = 1; i < lt.extruders.size(); ++i)
-                if (lt.extruders[i] == last_extruder_id) {
-                    // Move the last extruder to the front.
-                    memmove(lt.extruders.data() + 1, lt.extruders.data(), i * sizeof(unsigned int));
-                    lt.extruders.front() = last_extruder_id;
-                    break;
+
+            if (print_config == nullptr
+                || print_config->toolchange_ordering == ToolChangeOrderingType::Default)
+            {
+                // Reorder the extruders to start with the last one.
+                for (size_t i = 1; i < lt.extruders.size(); ++i) {
+                    if (lt.extruders[i] == last_extruder_id) {
+                        // Move the last extruder to the front.
+                        std::rotate(
+                            lt.extruders.begin(),
+                            lt.extruders.begin() + i,
+                            lt.extruders.begin() + i + 1
+                        );
+                        break;
+                    }
                 }
+            }
         }
         last_extruder_id = lt.extruders.back();
     }
@@ -252,6 +267,10 @@ void ToolOrdering::handle_dontcare_extruder(const std::vector<unsigned int>& too
 
 void ToolOrdering::handle_dontcare_extruder(unsigned int last_extruder_id)
 {
+    const PrintConfig* print_config = m_print_config_ptr;
+    if (!print_config && m_print_object_ptr)
+        print_config = &m_print_object_ptr->print()->config();
+
     if(m_layer_tools.empty())
         return;
     if(last_extruder_id == (unsigned int)-1){
@@ -275,6 +294,8 @@ void ToolOrdering::handle_dontcare_extruder(unsigned int last_extruder_id)
     }
 
     for (LayerTools &lt : m_layer_tools) {
+        // Extruders in lt.extruders are already sorted.
+
         if (lt.extruders.empty())
             continue;
         if (lt.extruders.size() == 1 && lt.extruders.front() == 0)
@@ -283,21 +304,30 @@ void ToolOrdering::handle_dontcare_extruder(unsigned int last_extruder_id)
             if (lt.extruders.front() == 0)
                 // Pop the "don't care" extruder, the "don't care" region will be merged with the next one.
                 lt.extruders.erase(lt.extruders.begin());
-            // Reorder the extruders to start with the last one.
-            for (size_t i = 1; i < lt.extruders.size(); ++ i)
-                if (lt.extruders[i] == last_extruder_id) {
-                    // Move the last extruder to the front.
-                    memmove(lt.extruders.data() + 1, lt.extruders.data(), i * sizeof(unsigned int));
-                    lt.extruders.front() = last_extruder_id;
-                    break;
+
+            if (print_config == nullptr
+                || print_config->toolchange_ordering == ToolChangeOrderingType::Default)
+            {
+                // Reorder the extruders to start with the last one.
+                for (size_t i = 1; i < lt.extruders.size(); ++i) {
+                    if (lt.extruders[i] == last_extruder_id) {
+                        // Move the last extruder to the front.
+                        std::rotate(
+                            lt.extruders.begin(),
+                            lt.extruders.begin() + i,
+                            lt.extruders.begin() + i + 1
+                        );
+                        break;
+                    }
                 }
+            }
 
             if (lt == m_layer_tools[0]) {
                 // On first layer with wipe tower, prefer a soluble extruder
                 // at the beginning, so it is not wiped on the first layer.
-                if (m_print_config_ptr && m_print_config_ptr->enable_prime_tower) {
+                if (print_config && print_config->enable_prime_tower) {
                     for (size_t i = 0; i<lt.extruders.size(); ++i)
-                        if (m_print_config_ptr->filament_soluble.get_at(lt.extruders[i]-1)) { // 1-based...
+                        if (print_config->filament_soluble.get_at(lt.extruders[i]-1)) { // 1-based...
                             std::swap(lt.extruders[i], lt.extruders.front());
                             break;
                         }
@@ -396,6 +426,7 @@ void ToolOrdering::sort_and_build_data(const PrintObject& object , unsigned int
 ToolOrdering::ToolOrdering(const PrintObject &object, unsigned int first_extruder, bool prime_multi_material)
 {
     m_print_full_config = &object.print()->full_print_config();
+    m_print_config_ptr = &object.print()->config();
     m_print_object_ptr = &object;
     m_print = const_cast<Print*>(object.print());
     if (object.layers().empty())
@@ -1329,8 +1360,11 @@ void ToolOrdering::reorder_extruders_for_minimum_flush_volume(bool reorder_first
     if (!m_layer_tools.empty())
         first_layer_filaments = m_layer_tools[0].extruders;
 
+    const bool use_cyclic_ordering =
+        (print_config->toolchange_ordering == ToolChangeOrderingType::Cyclic);
+
     // other_layers_seq: the layer_idx and extruder_idx are base on 1
-    auto get_custom_seq = [&other_layers_seqs, &reorder_first_layer, &first_layer_filaments](int layer_idx, std::vector<int>& out_seq) -> bool {
+    auto get_custom_seq = [&other_layers_seqs, &reorder_first_layer, &first_layer_filaments, &layer_filaments, use_cyclic_ordering](int layer_idx, std::vector<int>& out_seq) -> bool {
         if (!reorder_first_layer && layer_idx == 0) {
             out_seq.resize(first_layer_filaments.size());
             std::transform(first_layer_filaments.begin(), first_layer_filaments.end(), out_seq.begin(), [](auto item) {return item + 1; });
@@ -1343,6 +1377,15 @@ void ToolOrdering::reorder_extruders_for_minimum_flush_volume(bool reorder_first
                 return true;
             }
         }
+
+        if (use_cyclic_ordering && layer_idx >= 0 && size_t(layer_idx) < layer_filaments.size()) {
+            std::vector<unsigned int> ordered = layer_filaments[size_t(layer_idx)];
+            std::sort(ordered.begin(), ordered.end());
+            out_seq.resize(ordered.size());
+            std::transform(ordered.begin(), ordered.end(), out_seq.begin(), [](auto item) { return int(item) + 1; });
+            return true;
+        }
+
         return false;
         };
 

src/libslic3r/Preset.cpp

@@ -1272,6 +1272,7 @@ static std::vector<std::string> s_Preset_print_options{
     "wipe_tower_bridging",
     "wipe_tower_extra_flow",
     "single_extruder_multi_material_priming",
+    "toolchange_ordering",
     "wipe_tower_rotation_angle",
     "tree_support_branch_distance_organic",
     "tree_support_branch_diameter_organic",

src/libslic3r/Print.cpp

@@ -330,6 +330,7 @@ bool Print::invalidate_state_by_config_options(const ConfigOptionResolver & /* n
             || opt_key == "first_layer_print_sequence"
             || opt_key == "other_layers_print_sequence"
             || opt_key == "other_layers_print_sequence_nums" 
+            || opt_key == "toolchange_ordering"
             || opt_key == "extruder_ams_count"
             || opt_key == "filament_map_mode"
             || opt_key == "filament_map"

src/libslic3r/PrintConfig.cpp

@@ -522,6 +522,12 @@ static t_config_enum_values s_keys_map_PerimeterGeneratorType{
 };
 CONFIG_OPTION_ENUM_DEFINE_STATIC_MAPS(PerimeterGeneratorType)
 
+static t_config_enum_values s_keys_map_ToolChangeOrderingType {
+    { "default", int(ToolChangeOrderingType::Default) },
+    { "cyclic",  int(ToolChangeOrderingType::Cyclic) }
+};
+CONFIG_OPTION_ENUM_DEFINE_STATIC_MAPS(ToolChangeOrderingType)
+
 static const t_config_enum_values s_keys_map_ZHopType = {
     { "Auto Lift",          zhtAuto },
     { "Normal Lift",        zhtNormal },
@@ -6076,6 +6082,22 @@ void PrintConfigDef::init_fff_params()
     def->mode = comAdvanced;
     def->set_default_value(new ConfigOptionBool(false));
 
+    def = this->add("toolchange_ordering", coEnum);
+    def->label = L("Toolchange ordering");
+    def->category = L("Advanced");
+    def->tooltip = L(
+        "Determines the order of tool changes on each layer.\n"
+        "- Default: Starts with the last used extruder to minimize tool changes.\n"
+        "- Cyclic: Uses a fixed tool sequence each layer. This sacrifices speed for better surface quality, as the extra toolchanges allow layers more time to cool."
+    );
+    def->mode = comAdvanced;
+    def->enum_keys_map = &ConfigOptionEnum<ToolChangeOrderingType>::get_enum_values();
+    def->enum_values.emplace_back("default");
+    def->enum_values.emplace_back("cyclic");
+    def->enum_labels.emplace_back(L("Default"));
+    def->enum_labels.emplace_back(L("Cyclic"));
+    def->set_default_value(new ConfigOptionEnum<ToolChangeOrderingType>(ToolChangeOrderingType::Default));
+
     def = this->add("slice_closing_radius", coFloat);
     def->label = L("Slice gap closing radius");
     def->category = L("Quality");

src/libslic3r/PrintConfig.hpp

@@ -300,6 +300,12 @@ enum class PerimeterGeneratorType
     Arachne
 };
 
+enum class ToolChangeOrderingType
+{
+    Default,
+    Cyclic,
+};
+
 // BBS
 enum OverhangFanThreshold {
     Overhang_threshold_none = 0,
@@ -561,6 +567,7 @@ CONFIG_OPTION_ENUM_DECLARE_STATIC_MAPS(PrintHostType)
 CONFIG_OPTION_ENUM_DECLARE_STATIC_MAPS(AuthorizationType)
 CONFIG_OPTION_ENUM_DECLARE_STATIC_MAPS(WipeTowerWallType)
 CONFIG_OPTION_ENUM_DECLARE_STATIC_MAPS(PerimeterGeneratorType)
+CONFIG_OPTION_ENUM_DECLARE_STATIC_MAPS(ToolChangeOrderingType)
 CONFIG_OPTION_ENUM_DECLARE_STATIC_MAPS(PowerLossRecoveryMode)
 
 #undef CONFIG_OPTION_ENUM_DECLARE_STATIC_MAPS
@@ -1413,6 +1420,7 @@ PRINT_CONFIG_CLASS_DEFINE(
     ((ConfigOptionBool,                single_extruder_multi_material))
     ((ConfigOptionBool,                manual_filament_change))
     ((ConfigOptionBool,                single_extruder_multi_material_priming))
+    ((ConfigOptionEnum<ToolChangeOrderingType>, toolchange_ordering))
     ((ConfigOptionBool,                wipe_tower_no_sparse_layers))
     ((ConfigOptionString,              change_filament_gcode))
     ((ConfigOptionString,              change_extrusion_role_gcode))

src/slic3r/GUI/Tab.cpp

@@ -2976,6 +2976,7 @@ void TabPrint::build()
         optgroup->append_single_option_line("flush_into_support", "multimaterial_settings_flush_options#flush-into-objects-support");
         optgroup = page->new_optgroup(L("Advanced"), L"advanced");
         optgroup->append_single_option_line("interlocking_beam", "multimaterial_settings_advanced#interlocking-beam");
+        optgroup->append_single_option_line("toolchange_ordering", "multimaterial_settings_advanced#toolchange-ordering");
         optgroup->append_single_option_line("interface_shells", "multimaterial_settings_advanced#interface-shells");
         optgroup->append_single_option_line("mmu_segmented_region_max_width", "multimaterial_settings_advanced#maximum-width-of-segmented-region");
         optgroup->append_single_option_line("mmu_segmented_region_interlocking_depth", "multimaterial_settings_advanced#interlocking-depth-of-segmented-region");