Add extrusion role change G-code in Process and Filament (#11784)

* Add extrusion role change G-code options

Introduces new G-code options for handling extrusion role changes at the process and filament levels. Updates configuration, GUI, and GCode logic to support 'process_change_extrusion_role_gcode' and 'filament_change_extrusion_role_gcode', allowing custom G-code insertion when the extrusion role changes.

Co-Authored-By: Rodrigo Faselli <162915171+RF47@users.noreply.github.com>

* Optimize extrusion role-change gcode handling

Cache gcode template strings and current filament id, and guard creation of DynamicConfig/placeholder processing behind a check that at least one role-change gcode is non-empty. This avoids redundant config lookups and DynamicConfig/placeholder parsing when no custom role-change gcode is defined, improving clarity and performance without changing behavior.

---------

Co-authored-by: Rodrigo Faselli <162915171+RF47@users.noreply.github.com>

src/libslic3r/GCode.cpp

@@ -1946,6 +1946,7 @@ namespace DoExport {
         //if (ret.size() < MAX_TAGS_COUNT) check(_(L("Color Change G-code")), config.color_change_gcode.value);
         //Orca
         if (ret.size() < MAX_TAGS_COUNT) check(_(L("Change extrusion role G-code")), config.change_extrusion_role_gcode.value);
+        if (ret.size() < MAX_TAGS_COUNT) check(_(L("Process change extrusion role G-code")), config.process_change_extrusion_role_gcode.value);
         if (ret.size() < MAX_TAGS_COUNT) check(_(L("Pause G-code")), config.machine_pause_gcode.value);
         if (ret.size() < MAX_TAGS_COUNT) check(_(L("Template Custom G-code")), config.template_custom_gcode.value);
         if (ret.size() < MAX_TAGS_COUNT) {
@@ -1962,6 +1963,13 @@ namespace DoExport {
                     break;
             }
         }
+        if (ret.size() < MAX_TAGS_COUNT) {
+            for (const std::string& value : config.filament_change_extrusion_role_gcode.values) {
+                check(_(L("Filament change extrusion role G-code")), value);
+                if (ret.size() == MAX_TAGS_COUNT)
+                    break;
+            }
+        }
         //BBS: no custom_gcode_per_print_z, don't need to check
         //if (ret.size() < MAX_TAGS_COUNT) {
         //    const CustomGCode::Info& custom_gcode_per_print_z = print.model().custom_gcode_per_print_z;
@@ -5423,6 +5431,7 @@ void GCode::apply_print_config(const PrintConfig &print_config)
              &m_config.time_lapse_gcode,
              &m_config.change_filament_gcode,
              &m_config.change_extrusion_role_gcode,
+             &m_config.process_change_extrusion_role_gcode,
              &m_config.printing_by_object_gcode,
              &m_config.machine_pause_gcode,
              &m_config.template_custom_gcode,
@@ -5432,7 +5441,8 @@ void GCode::apply_print_config(const PrintConfig &print_config)
     }
     for (auto opt : std::initializer_list<ConfigOptionStrings*>{
              &m_config.filament_start_gcode,
-             &m_config.filament_end_gcode
+             &m_config.filament_end_gcode,
+             &m_config.filament_change_extrusion_role_gcode
          }) {
         if (opt->empty())
             for (int i = 0; i < opt->size(); ++i)
@@ -6551,15 +6561,29 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
     // Orca: End of dynamic PA trigger flag segment
     
     //Orca: process custom gcode for extrusion role change
-    if (path.role() != m_last_extrusion_role && !m_config.change_extrusion_role_gcode.value.empty()) {
+    if (path.role() != m_last_extrusion_role) {
+        const auto current_filament_id = m_writer.filament()->id();
+        const std::string& machine_role_change_gcode  = m_config.change_extrusion_role_gcode.value;
+        const std::string& filament_role_change_gcode = m_config.filament_change_extrusion_role_gcode.get_at(current_filament_id);
+        const std::string& process_role_change_gcode  = m_config.process_change_extrusion_role_gcode.value;
+
+        if (!machine_role_change_gcode.empty() || !filament_role_change_gcode.empty() || !process_role_change_gcode.empty()) {
             DynamicConfig config;
             config.set_key_value("extrusion_role", new ConfigOptionString(extrusion_role_to_string_for_parser(path.role())));
             config.set_key_value("last_extrusion_role", new ConfigOptionString(extrusion_role_to_string_for_parser(m_last_extrusion_role)));
             config.set_key_value("layer_num", new ConfigOptionInt(m_layer_index + 1));
             config.set_key_value("layer_z", new ConfigOptionFloat(m_layer == nullptr ? m_last_height : m_layer->print_z));
-            gcode += this->placeholder_parser_process("change_extrusion_role_gcode",
+
-                                                      m_config.change_extrusion_role_gcode.value, m_writer.filament()->id(), &config)
+            const auto append_role_gcode = [this, current_filament_id, &config, &gcode](const std::string& key, const std::string& templ) {
-                     + "\n";
+                if (templ.empty())
+                    return;
+                gcode += this->placeholder_parser_process(key, templ, current_filament_id, &config) + "\n";
+            };
+
+            append_role_gcode("change_extrusion_role_gcode", machine_role_change_gcode);
+            append_role_gcode("filament_change_extrusion_role_gcode", filament_role_change_gcode);
+            append_role_gcode("process_change_extrusion_role_gcode", process_role_change_gcode);
+        }
     }
 
     // extrude arc or line

src/libslic3r/Preset.cpp

@@ -934,8 +934,8 @@ static std::vector<std::string> s_Preset_print_options {
      "support_bottom_interface_spacing", "enable_overhang_speed", "slowdown_for_curled_perimeters", "overhang_1_4_speed", "overhang_2_4_speed", "overhang_3_4_speed", "overhang_4_4_speed",
      "initial_layer_infill_speed", "only_one_wall_top", 
      "timelapse_type",
-     "wall_generator", "wall_transition_length", "wall_transition_filter_deviation", "wall_transition_angle",
+    "wall_generator", "wall_transition_length", "wall_transition_filter_deviation", "wall_transition_angle",
-     "wall_distribution_count", "min_feature_size", "min_bead_width", "post_process", "min_length_factor",
+    "wall_distribution_count", "min_feature_size", "min_bead_width", "post_process", "process_change_extrusion_role_gcode", "min_length_factor",
      "small_perimeter_speed", "small_perimeter_threshold","bridge_angle","internal_bridge_angle", "filter_out_gap_fill", "travel_acceleration","inner_wall_acceleration", "min_width_top_surface",
      "default_jerk", "outer_wall_jerk", "inner_wall_jerk", "infill_jerk", "top_surface_jerk", "initial_layer_jerk","travel_jerk","default_junction_deviation",
      "top_solid_infill_flow_ratio","bottom_solid_infill_flow_ratio","only_one_wall_first_layer", "print_flow_ratio", "seam_gap",
@@ -970,7 +970,7 @@ static std::vector<std::string> s_Preset_filament_options {/*"filament_colour",
     //BBS:temperature_vitrification
     "temperature_vitrification", "reduce_fan_stop_start_freq","dont_slow_down_outer_wall", "slow_down_for_layer_cooling", "fan_min_speed",
     "fan_max_speed", "enable_overhang_bridge_fan", "overhang_fan_speed", "overhang_fan_threshold", "close_fan_the_first_x_layers", "full_fan_speed_layer", "fan_cooling_layer_time", "slow_down_layer_time", "slow_down_min_speed",
-    "filament_start_gcode", "filament_end_gcode",
+    "filament_start_gcode", "filament_end_gcode", "filament_change_extrusion_role_gcode",
     //exhaust fan control
     "activate_air_filtration","activate_air_filtration_during_print","activate_air_filtration_on_completion","during_print_exhaust_fan_speed","complete_print_exhaust_fan_speed",
     // Retract overrides

src/libslic3r/PrintConfig.cpp

@@ -4674,6 +4674,15 @@ void PrintConfigDef::init_fff_params()
     def->height = 6;
     def->mode = comAdvanced;
     def->set_default_value(new ConfigOptionStrings());
+
+    def = this->add("process_change_extrusion_role_gcode", coString);
+    def->label = L("Change extrusion role G-code (process)");
+    def->tooltip = L("This G-code is inserted when the extrusion role is changed. It runs after the machine and filament extrusion role G-code.");
+    def->multiline = true;
+    def->full_width = true;
+    def->height = 5;
+    def->mode = comAdvanced;
+    def->set_default_value(new ConfigOptionString());
     
     def = this->add("printer_model", coString);
     def->label = L("Printer type");
@@ -6234,6 +6243,15 @@ void PrintConfigDef::init_fff_params()
     def->mode = comAdvanced;
     def->set_default_value(new ConfigOptionString());
 
+    def = this->add("filament_change_extrusion_role_gcode", coStrings);
+    def->label = L("Change extrusion role G-code (filament)");
+    def->tooltip = L("This G-code is inserted when the extrusion role is changed for the active filament.");
+    def->multiline = true;
+    def->full_width = true;
+    def->height = 5;
+    def->mode = comAdvanced;
+    def->set_default_value(new ConfigOptionStrings{ "" });
+
     def = this->add("top_surface_line_width", coFloatOrPercent);
     def->label = L("Top surface");
     def->category = L("Quality");
@@ -10707,6 +10725,8 @@ static std::map<t_custom_gcode_key, t_config_option_keys> s_CustomGcodeSpecificP
                                "travel_point_1_x", "travel_point_1_y", "travel_point_2_x", "travel_point_2_y", "travel_point_3_x",
                                "travel_point_3_y", "x_after_toolchange", "y_after_toolchange", "z_after_toolchange"}},
     {"change_extrusion_role_gcode", {"layer_num", "layer_z", "extrusion_role", "last_extrusion_role"}},
+    {"filament_change_extrusion_role_gcode", {"layer_num", "layer_z", "extrusion_role", "last_extrusion_role"}},
+    {"process_change_extrusion_role_gcode", {"layer_num", "layer_z", "extrusion_role", "last_extrusion_role"}},
     {"printing_by_object_gcode",    {}},
     {"machine_pause_gcode",         {}},
     {"template_custom_gcode",       {}},

src/libslic3r/PrintConfig.hpp

@@ -1336,6 +1336,8 @@ PRINT_CONFIG_CLASS_DEFINE(
     ((ConfigOptionBool,                wipe_tower_no_sparse_layers))
     ((ConfigOptionString,              change_filament_gcode))
     ((ConfigOptionString,              change_extrusion_role_gcode))
+    ((ConfigOptionString,              process_change_extrusion_role_gcode))
+    ((ConfigOptionStrings,             filament_change_extrusion_role_gcode))
     ((ConfigOptionFloat,               travel_speed))
     ((ConfigOptionFloat,               travel_speed_z))
     ((ConfigOptionBool,                silent_mode))

src/slic3r/GUI/Tab.cpp

@@ -67,6 +67,9 @@ namespace GUI {
 
 #define DISABLE_UNDO_SYS
 
+// Forward declaration for early use; definitions live later in this translation unit.
+static void validate_custom_gcode_cb(Tab* tab, const wxString& title, const t_config_option_key& opt_key, const boost::any& value);
+
 static const std::vector<std::string> plate_keys = { "curr_bed_type", "skirt_start_angle", "first_layer_print_sequence", "first_layer_sequence_choice", "other_layers_print_sequence", "other_layers_sequence_choice", "print_sequence", "spiral_mode"};
 
 void Tab::Highlighter::set_timer_owner(wxEvtHandler* owner, int timerid/* = wxID_ANY*/)
@@ -2702,6 +2705,17 @@ void TabPrint::build()
         // option.opt.height = 5;
         optgroup->append_single_option_line(option, "others_settings_g_code_output#filename-format");
 
+        optgroup = page->new_optgroup(L("Change extrusion role G-code"), L"param_gcode", 0);
+        optgroup->m_on_change = [this, &optgroup_title = optgroup->title](const t_config_option_key& opt_key, const boost::any& value) {
+            validate_custom_gcode_cb(this, optgroup_title, opt_key, value);
+        };
+        optgroup->edit_custom_gcode = [this](const t_config_option_key& opt_key) { edit_custom_gcode(opt_key); };
+        option = optgroup->get_option("process_change_extrusion_role_gcode");
+        option.opt.full_width = true;
+        option.opt.is_code = true;
+        option.opt.height = 15;
+        optgroup->append_single_option_line(option);
+
         optgroup = page->new_optgroup(L("Post-processing Scripts"), L"param_gcode", 0);
         option = optgroup->get_option("post_process");
         option.opt.full_width = true;
@@ -4052,6 +4066,17 @@ void TabFilament::build()
         option.opt.height = gcode_field_height;// 150;
         optgroup->append_single_option_line(option);
 
+        optgroup = page->new_optgroup(L("Change extrusion role G-code"), L"param_gcode", 0);
+        optgroup->m_on_change = [this, &optgroup_title = optgroup->title](const t_config_option_key& opt_key, const boost::any& value) {
+            validate_custom_gcode_cb(this, optgroup_title, opt_key, value);
+        };
+        optgroup->edit_custom_gcode = edit_custom_gcode_fn;
+        option = optgroup->get_option("filament_change_extrusion_role_gcode");
+        option.opt.full_width = true;
+        option.opt.is_code = true;
+        option.opt.height = gcode_field_height;// 150;
+        optgroup->append_single_option_line(option);
+
         optgroup = page->new_optgroup(L("Filament end G-code"), L"param_gcode", 0);
         optgroup->m_on_change = [this, &optgroup_title = optgroup->title](const t_config_option_key& opt_key, const boost::any& value) {
             validate_custom_gcode_cb(this, optgroup_title, opt_key, value);