Combined infill max layer height (optional) parameter

src/libslic3r/Preset.cpp

@@ -794,7 +794,7 @@ static std::vector<std::string> s_Preset_print_options {
      "tree_support_branch_angle", "tree_support_angle_slow", "tree_support_wall_count", "tree_support_top_rate", "tree_support_branch_distance", "tree_support_tip_diameter",
      "tree_support_branch_diameter", "tree_support_branch_diameter_angle", "tree_support_branch_diameter_double_wall",
      "detect_narrow_internal_solid_infill",
-     "gcode_add_line_number", "enable_arc_fitting", "precise_z_height", "infill_combination", /*"adaptive_layer_height",*/
+     "gcode_add_line_number", "enable_arc_fitting", "precise_z_height", "infill_combination","infill_combination_max_layer_height", /*"adaptive_layer_height",*/
      "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",

src/libslic3r/PrintConfig.cpp

@@ -2812,7 +2812,20 @@ void PrintConfigDef::init_fff_params()
                      "with original layer height.");
     def->mode = comAdvanced;
     def->set_default_value(new ConfigOptionBool(false));
-
+
+    // Orca: max layer height for combined infill
+    def = this->add("infill_combination_max_layer_height", coFloatOrPercent);
+    def->label = L("Infill combination - Max layer height");
+    def->category = L("Strength");
+    def->tooltip = L("Maximum layer height for the combined sparse infill. \n\nSet it to 0 or 100% to use the nozzle diameter (for maximum reduction in print time) or a value of ~80% to maximize sparse infill strength.\n\n"
+                     "The number of layers over which infill is combined is derived by dividing this value with the layer height and rounded down to the nearest decimal.\n\n"
+                     "Use either absolute mm values (eg. 0.32mm for a 0.4mm nozzle) or % values (eg 80%). This value must not be larger "
+                     "than the nozzle diameter.");
+    def->sidetext = L("mm or %");
+    def->min = 0;
+    def->mode = comAdvanced;
+    def->set_default_value(new ConfigOptionFloatOrPercent(100., true));
+
     def = this->add("sparse_infill_filament", coInt);
     def->gui_type = ConfigOptionDef::GUIType::i_enum_open;
     def->label = L("Infill");

src/libslic3r/PrintConfig.hpp

@@ -898,6 +898,8 @@ PRINT_CONFIG_CLASS_DEFINE(
     ((ConfigOptionFloat,                sparse_infill_speed))
     //BBS
     ((ConfigOptionBool, infill_combination))
+    // Orca:
+    ((ConfigOptionFloatOrPercent,                infill_combination_max_layer_height))
     // Ironing options
     ((ConfigOptionEnum<IroningType>, ironing_type))
     ((ConfigOptionEnum<InfillPattern>, ironing_pattern))

src/libslic3r/PrintObject.cpp

@@ -1066,6 +1066,7 @@ bool PrintObject::invalidate_state_by_config_options(
         } else if (
                opt_key == "interface_shells"
             || opt_key == "infill_combination"
+            || opt_key == "infill_combination_max_layer_height"
             || opt_key == "bottom_shell_thickness"
             || opt_key == "top_shell_thickness"
             || opt_key == "minimum_sparse_infill_area"
@@ -3418,6 +3419,11 @@ void PrintObject::combine_infill()
         double nozzle_diameter = std::min(
             this->print()->config().nozzle_diameter.get_at(region.config().sparse_infill_filament.value - 1),
             this->print()->config().nozzle_diameter.get_at(region.config().solid_infill_filament.value - 1));
+
+        //Orca: Limit combination of infill to up to infill_combination_max_layer_height
+        const double infill_combination_max_layer_height = region.config().infill_combination_max_layer_height.get_abs_value(nozzle_diameter);
+        nozzle_diameter = infill_combination_max_layer_height > 0 ? std::min(infill_combination_max_layer_height, nozzle_diameter) : nozzle_diameter;
+
         // define the combinations
         std::vector<size_t> combine(m_layers.size(), 0);
         {

src/slic3r/GUI/ConfigManipulation.cpp

@@ -527,6 +527,9 @@ void ConfigManipulation::toggle_print_fff_options(DynamicPrintConfig *config, co
         "minimum_sparse_infill_area", "sparse_infill_filament", "infill_anchor_max"})
         toggle_line(el, have_infill);
 
+    bool have_combined_infill = config->opt_bool("infill_combination") && have_infill;
+    toggle_line("infill_combination_max_layer_height", have_combined_infill);
+
     // Only allow configuration of open anchors if the anchoring is enabled.
     bool has_infill_anchors = have_infill && config->option<ConfigOptionFloatOrPercent>("infill_anchor_max")->value > 0;
     toggle_field("infill_anchor", has_infill_anchors);

src/slic3r/GUI/GUI_Factories.cpp

@@ -106,7 +106,7 @@ std::map<std::string, std::vector<SimpleSettingData>>  SettingsFactory::PART_CAT
     { L("Strength"), {{"wall_loops", "",1},{"top_shell_layers", L("Top Solid Layers"),1},{"top_shell_thickness", L("Top Minimum Shell Thickness"),1},
                     {"bottom_shell_layers", L("Bottom Solid Layers"),1}, {"bottom_shell_thickness", L("Bottom Minimum Shell Thickness"),1},
                     {"sparse_infill_density", "",1},{"sparse_infill_pattern", "",1},{"infill_anchor", "",1},{"infill_anchor_max", "",1},{"top_surface_pattern", "",1},{"bottom_surface_pattern", "",1}, {"internal_solid_infill_pattern", "",1},
-                    {"infill_combination", "",1}, {"infill_wall_overlap", "",1},{"top_bottom_infill_wall_overlap", "",1}, {"solid_infill_direction", "",1}, {"rotate_solid_infill_direction", "",1}, {"infill_direction", "",1}, {"bridge_angle", "",1}, {"minimum_sparse_infill_area", "",1}
+                    {"infill_combination", "",1}, {"infill_combination_max_layer_height", "",1}, {"infill_wall_overlap", "",1},{"top_bottom_infill_wall_overlap", "",1}, {"solid_infill_direction", "",1}, {"rotate_solid_infill_direction", "",1}, {"infill_direction", "",1}, {"bridge_angle", "",1}, {"minimum_sparse_infill_area", "",1}
                     }},
     { L("Speed"), {{"outer_wall_speed", "",1},{"inner_wall_speed", "",2},{"sparse_infill_speed", "",3},{"top_surface_speed", "",4}, {"internal_solid_infill_speed", "",5},
                     {"enable_overhang_speed", "",6}, {"overhang_speed_classic", "",6}, {"overhang_1_4_speed", "",7}, {"overhang_2_4_speed", "",8}, {"overhang_3_4_speed", "",9}, {"overhang_4_4_speed", "",10},

src/slic3r/GUI/Tab.cpp

@@ -2141,6 +2141,7 @@ void TabPrint::build()
         optgroup->append_single_option_line("bridge_angle");
         optgroup->append_single_option_line("minimum_sparse_infill_area");
         optgroup->append_single_option_line("infill_combination");
+        optgroup->append_single_option_line("infill_combination_max_layer_height");
         optgroup->append_single_option_line("detect_narrow_internal_solid_infill");
         optgroup->append_single_option_line("ensure_vertical_shell_thickness");