Option to always travel to wipe tower before Tx commands on multi-toolhead setups using type 2 tower (#13703)

* Option to always travel to wipe tower before Tx commands on multi-toolhead setups using type 2 tower

src/libslic3r/GCode.cpp

@@ -1161,10 +1161,15 @@ static std::vector<Vec2d> get_path_of_change_filament(const Print& print)
         const bool is_ramming       = (gcodegen.config().single_extruder_multi_material) ||
                                 (!gcodegen.config().single_extruder_multi_material &&
                                  gcodegen.config().filament_multitool_ramming.get_at(tcr.initial_tool));
+        // Orca: user-facing override (Printer Settings > Wipe tower > "Tool change on wipe tower").
+        // Forces the toolhead to travel over the wipe tower before issuing Tx even on multi-toolhead
+        // printers without ramming, where Orca would otherwise emit Tx in place (potentially over the part).
+        const bool tool_change_on_wipe_tower = gcodegen.config().tool_change_on_wipe_tower.value;
         const bool should_travel_to_tower = !tcr.priming && (tcr.force_travel     // wipe tower says so
                                                              || !needs_toolchange // this is just finishing the tower with no toolchange
                                                              || will_go_down // Make sure to move to prime tower before moving down
-                                                             || is_ramming);
+                                                             || is_ramming
+                                                             || tool_change_on_wipe_tower);
 
         if (should_travel_to_tower || gcodegen.m_need_change_layer_lift_z) {
             // FIXME: It would be better if the wipe tower set the force_travel flag for all toolchanges,

src/libslic3r/Preset.cpp

@@ -1343,7 +1343,7 @@ static std::vector<std::string> s_Preset_printer_options {
     "use_relative_e_distances", "extruder_type", "use_firmware_retraction", "printer_notes",
     "grab_length", "support_object_skip_flush", "physical_extruder_map",
     "cooling_tube_retraction",
-    "cooling_tube_length", "high_current_on_filament_swap", "parking_pos_retraction", "extra_loading_move", "wipe_tower_type", "purge_in_prime_tower", "enable_filament_ramming",
+    "cooling_tube_length", "high_current_on_filament_swap", "parking_pos_retraction", "extra_loading_move", "wipe_tower_type", "purge_in_prime_tower", "enable_filament_ramming", "tool_change_on_wipe_tower",
     "z_offset",
     "disable_m73", "preferred_orientation", "emit_machine_limits_to_gcode", "pellet_modded_printer", "support_multi_bed_types", "default_bed_type", "bed_mesh_min","bed_mesh_max","bed_mesh_probe_distance", "adaptive_bed_mesh_margin", "enable_long_retraction_when_cut","long_retractions_when_cut","retraction_distances_when_cut",
     "bed_temperature_formula", "nozzle_flush_dataset"

src/libslic3r/Print.cpp

@@ -359,6 +359,7 @@ bool Print::invalidate_state_by_config_options(const ConfigOptionResolver & /* n
             || opt_key == "wipe_tower_filament"
             || opt_key == "wiping_volumes_extruders"
             || opt_key == "enable_filament_ramming"
+            || opt_key == "tool_change_on_wipe_tower"
             || opt_key == "purge_in_prime_tower"
             || opt_key == "z_offset"
             || opt_key == "support_multi_bed_types"

src/libslic3r/PrintConfig.cpp

@@ -5806,6 +5806,16 @@ void PrintConfigDef::init_fff_params()
     def->mode = comAdvanced;
     def->set_default_value(new ConfigOptionBool(true));
 
+    def = this->add("tool_change_on_wipe_tower", coBool);
+    def->label = L("Tool change on wipe tower");
+    def->tooltip = L("Force the toolhead to travel to the wipe tower before issuing the tool change command (Tx). "
+                     "Only relevant for multi-extruder (multi-toolhead) printers using a Type 2 wipe tower. "
+                     "By default Orca skips the travel on multi-toolhead machines because the firmware handles the head swap, "
+                     "which can result in the Tx command being issued above the printed part. "
+                     "Enable this option if you want the tool change to always be issued above the wipe tower instead.");
+    def->mode = comAdvanced;
+    def->set_default_value(new ConfigOptionBool(false));
+
 
     def = this->add("wipe_tower_no_sparse_layers", coBool);
     def->label = L("No sparse layers (beta)");

src/libslic3r/PrintConfig.hpp

@@ -1452,6 +1452,7 @@ PRINT_CONFIG_CLASS_DEFINE(
     ((ConfigOptionEnum<WipeTowerType>, wipe_tower_type))
     ((ConfigOptionBool,                purge_in_prime_tower))
     ((ConfigOptionBool,                enable_filament_ramming))
+    ((ConfigOptionBool,                tool_change_on_wipe_tower))
     ((ConfigOptionBool,                support_multi_bed_types))
 
     // Small Area Infill Flow Compensation