[FEATURE] Only one perimeter on first layer

src/libslic3r/PerimeterGenerator.cpp

@@ -1384,7 +1384,7 @@ void PerimeterGenerator::process_classic(
     int        loop_number = params.config.perimeters + surface.extra_perimeters - 1;  // 0-indexed loops
 
     // SuperSlicer: set the topmost layer to be one perimeter
-    if (loop_number > 0 && params.config.only_one_perimeter_top && upper_slices == nullptr)
+    if ((params.layer_id == 0 && params.config.only_one_perimeter_first_layer) || (loop_number > 0 && params.config.only_one_perimeter_top && upper_slices == nullptr))
         loop_number = 0;
 
     ExPolygons last        = union_ex(surface.expolygon.simplify_p(params.scaled_resolution));

src/libslic3r/Preset.cpp

@@ -474,7 +474,7 @@ static std::vector<std::string> s_Preset_print_options {
     "perimeter_generator", "wall_transition_length", "wall_transition_filter_deviation", "wall_transition_angle",
     "wall_distribution_count", "min_feature_size", "min_bead_width",
     // SuperSlicer
-    "only_one_perimeter_top", "min_width_top_surface", "solid_fill_pattern",
+    "only_one_perimeter_first_layer", "only_one_perimeter_top", "min_width_top_surface", "solid_fill_pattern",
 };
 
 static std::vector<std::string> s_Preset_filament_options {

src/libslic3r/PrintConfig.cpp

@@ -586,6 +586,12 @@ void PrintConfigDef::init_fff_params()
     def->mode = comAdvanced;
     def->set_default_value(new ConfigOptionFloat(1));
 
+    def = this->add("only_one_perimeter_first_layer", coBool);
+    def->label = L("On First layer");
+    def->category = L("Layers and Perimeters");
+    def->tooltip = L("Use only one perimeter on first layer, to give more space to the top infill pattern.");
+    def->set_default_value(new ConfigOptionBool(false));
+
     def = this->add("only_one_perimeter_top", coBool);
     def->label = L("On top surfaces");
     def->category = L("Layers and Perimeters");

src/libslic3r/PrintConfig.hpp

@@ -664,6 +664,7 @@ PRINT_CONFIG_CLASS_DEFINE(
     ((ConfigOptionFloatOrPercent,       top_solid_infill_speed))
     ((ConfigOptionBool,                 wipe_into_infill))
     // SuperSlicer
+    ((ConfigOptionBool,                 only_one_perimeter_first_layer))
     ((ConfigOptionBool,                 only_one_perimeter_top))
     ((ConfigOptionFloatOrPercent,       min_width_top_surface))
     ((ConfigOptionEnum<InfillPattern>,  solid_fill_pattern))

src/libslic3r/PrintObject.cpp

@@ -708,7 +708,8 @@ bool PrintObject::invalidate_state_by_config_options(
             // Brim is printed below supports, support invalidates brim and skirt.
             steps.emplace_back(posSupportMaterial);
         } else if (
-               opt_key == "only_one_perimeter_top") {
+               opt_key == "only_one_perimeter_first_layer"
+               || opt_key == "only_one_perimeter_top") {
             steps.emplace_back(posPerimeters);
         } else if (
                opt_key == "perimeters"

src/slic3r/GUI/ConfigManipulation.cpp

@@ -76,7 +76,7 @@ void ConfigManipulation::update_print_fff_config(DynamicPrintConfig* config, con
     double fill_density = config->option<ConfigOptionPercent>("fill_density")->value;
 
     if (config->opt_bool("spiral_vase") &&
-        ! (config->opt_int("perimeters") == 1 && 
+        ! (config->opt_int("perimeters") == 1 &&
            config->opt_int("top_solid_layers") == 0 &&
            fill_density == 0 &&
            ! config->opt_bool("support_material") &&
@@ -102,7 +102,7 @@ void ConfigManipulation::update_print_fff_config(DynamicPrintConfig* config, con
             new_conf.set_key_value("fill_density", new ConfigOptionPercent(0));
             new_conf.set_key_value("support_material", new ConfigOptionBool(false));
             new_conf.set_key_value("support_material_enforce_layers", new ConfigOptionInt(0));
-            new_conf.set_key_value("thin_walls", new ConfigOptionBool(false));            
+            new_conf.set_key_value("thin_walls", new ConfigOptionBool(false));
             fill_density = 0;
             support = false;
         }
@@ -117,7 +117,7 @@ void ConfigManipulation::update_print_fff_config(DynamicPrintConfig* config, con
         }
     }
 
-    if (config->opt_bool("wipe_tower") && config->opt_bool("support_material") && 
+    if (config->opt_bool("wipe_tower") && config->opt_bool("support_material") &&
         // Organic supports are always synchronized with object layers as of now.
         config->opt_enum<SupportMaterialStyle>("support_material_style") != smsOrganic) {
         if (config->opt_float("support_material_contact_distance") == 0) {
@@ -288,7 +288,7 @@ void ConfigManipulation::toggle_print_fff_options(DynamicPrintConfig* config)
     bool have_support_soluble = have_support_material && config->opt_float("support_material_contact_distance") == 0;
     auto support_material_style = config->opt_enum<SupportMaterialStyle>("support_material_style");
     for (auto el : { "support_material_style", "support_material_pattern", "support_material_with_sheath",
-                    "support_material_spacing", "support_material_angle", 
+                    "support_material_spacing", "support_material_angle",
                     "support_material_interface_pattern", "support_material_interface_layers",
                     "dont_support_bridges", "support_material_extrusion_width", "support_material_contact_distance",
                     "support_material_xy_spacing" })
@@ -297,11 +297,11 @@ void ConfigManipulation::toggle_print_fff_options(DynamicPrintConfig* config)
     toggle_field("support_material_bottom_contact_distance", have_support_material && ! have_support_soluble);
     toggle_field("support_material_closing_radius", have_support_material && support_material_style == smsSnug);
 
-    const bool has_organic_supports = support_material_style == smsOrganic && 
-                                     (config->opt_bool("support_material") || 
+    const bool has_organic_supports = support_material_style == smsOrganic &&
+                                     (config->opt_bool("support_material") ||
                                       config->opt_int("support_material_enforce_layers") > 0);
     for (const std::string& key : { "support_tree_angle", "support_tree_angle_slow", "support_tree_branch_diameter",
-                                    "support_tree_branch_diameter_angle", "support_tree_branch_diameter_double_wall", 
+                                    "support_tree_branch_diameter_angle", "support_tree_branch_diameter_double_wall",
                                     "support_tree_tip_diameter", "support_tree_branch_distance", "support_tree_top_rate" })
         toggle_field(key, has_organic_supports);
 
@@ -352,6 +352,7 @@ void ConfigManipulation::toggle_print_fff_options(DynamicPrintConfig* config)
     toggle_field("min_bead_width", have_arachne);
     toggle_field("thin_walls", !have_arachne);
 
+    toggle_field("only_one_perimeter_first_layer", !have_arachne);
     toggle_field("only_one_perimeter_top", !have_arachne);
     toggle_field("min_width_top_surface", have_perimeters && config->opt_bool("only_one_perimeter_top") && !have_arachne);
 }

src/slic3r/GUI/Tab.cpp

@@ -1474,6 +1474,7 @@ void TabPrint::build()
         optgroup = page->new_optgroup(L("Quality (slower slicing)"));
         line = { L("Only one perimeter"), "" };
         line.label_path = category_path + "only-one-perimeter-top-bottom";
+        line.append_option(optgroup->get_option("only_one_perimeter_first_layer"));
         line.append_option(optgroup->get_option("only_one_perimeter_top"));
         line.append_option(optgroup->get_option("min_width_top_surface"));
         optgroup->append_line(line);