UI integration, new option for speed on overhangs

src/libslic3r/GCode.cpp

@@ -2877,7 +2877,9 @@ std::string GCode::_extrude(const ExtrusionPath &path, const std::string_view de
             speed = m_config.get_abs_value("perimeter_speed");
         } else if (path.role() == erExternalPerimeter) {
             speed = m_config.get_abs_value("external_perimeter_speed");
-        } else if (path.role() == erOverhangPerimeter || path.role() == erBridgeInfill) {
+        }else if (path.role() == erOverhangPerimeter){
+            speed = m_config.get_abs_value("overhang_speed");
+        } else if (path.role() == erBridgeInfill) {
             speed = m_config.get_abs_value("bridge_speed");
         } else if (path.role() == erInternalInfill) {
             speed = m_config.get_abs_value("infill_speed");
@@ -3002,12 +3004,13 @@ std::string GCode::_extrude(const ExtrusionPath &path, const std::string_view de
             prev = p;
         }
     } else {
+        double overhang_speed = m_config.get_abs_value("overhang_speed");
         std::string comment;
         if (m_config.gcode_comments) {
             comment = description;
             comment += description_bridge;
         }
-        double last_set_speed = std::max(5.0, new_points[0].speed_factor * speed) * 60.0;
+        double last_set_speed = std::max(overhang_speed, new_points[0].speed_factor * speed) * 60.0;
         gcode += m_writer.set_speed(last_set_speed, "", comment);
         Vec2d prev = this->point_to_gcode_quantized(new_points[0].p);
         for (size_t i = 1; i < new_points.size(); i++) {
@@ -3016,7 +3019,7 @@ std::string GCode::_extrude(const ExtrusionPath &path, const std::string_view de
             const double line_length = (p - prev).norm();
             gcode += m_writer.extrude_to_xy(p, e_per_mm * line_length, comment);
             prev = p;
-            double new_speed = std::max(5.0, procesed_point.speed_factor * speed) * 60.0;
+            double new_speed = std::max(overhang_speed, procesed_point.speed_factor * speed) * 60.0;
             if (last_set_speed != new_speed) {
                 gcode += m_writer.set_speed(new_speed, "", comment);
                 last_set_speed = new_speed;

src/libslic3r/Preset.cpp

@@ -428,7 +428,7 @@ static std::vector<std::string> s_Preset_print_options {
     "max_print_speed", "max_volumetric_speed", "avoid_crossing_perimeters_max_detour",
     "fuzzy_skin", "fuzzy_skin_thickness", "fuzzy_skin_point_dist",
     "max_volumetric_extrusion_rate_slope_positive", "max_volumetric_extrusion_rate_slope_negative",
-    "perimeter_speed", "small_perimeter_speed", "external_perimeter_speed", "infill_speed", "solid_infill_speed",
+    "perimeter_speed", "small_perimeter_speed", "external_perimeter_speed", "overhang_speed", "infill_speed", "solid_infill_speed",
     "top_solid_infill_speed", "support_material_speed", "support_material_xy_spacing", "support_material_interface_speed",
     "bridge_speed", "gap_fill_speed", "gap_fill_enabled", "travel_speed", "travel_speed_z", "first_layer_speed", "first_layer_speed_over_raft", "perimeter_acceleration", "infill_acceleration",
     "bridge_acceleration", "first_layer_acceleration", "first_layer_acceleration_over_raft", "default_acceleration", "skirts", "skirt_distance", "skirt_height", "draft_shield",

src/libslic3r/PrintConfig.cpp

@@ -2358,6 +2358,18 @@ void PrintConfigDef::init_fff_params()
     def->mode = comAdvanced;
     def->set_default_value(new ConfigOptionFloatOrPercent(15, false));
 
+    def             = this->add("overhang_speed", coFloatOrPercent);
+    def->label      = L("Overhangs");
+    def->category   = L("Speed");
+    def->tooltip    = L("This setting controls the speed of overhangs."
+                           "If expressed as percentage (for example: 80%) it will be calculated "
+                           "on the external perimeters speed setting. Set to zero for auto.");
+    def->sidetext   = L("mm/s or %");
+    def->ratio_over = "external_perimeter_speed";
+    def->min        = 0;
+    def->mode       = comAdvanced;
+    def->set_default_value(new ConfigOptionFloatOrPercent(5, false));
+
     def = this->add("solid_infill_below_area", coFloat);
     def->label = L("Solid infill threshold area");
     def->category = L("Infill");

src/libslic3r/PrintConfig.hpp

@@ -564,6 +564,7 @@ PRINT_CONFIG_CLASS_DEFINE(
     ((ConfigOptionEnum<InfillPattern>,  bottom_fill_pattern))
     ((ConfigOptionFloatOrPercent,       external_perimeter_extrusion_width))
     ((ConfigOptionFloatOrPercent,       external_perimeter_speed))
+    ((ConfigOptionFloatOrPercent,       overhang_speed))
     ((ConfigOptionBool,                 external_perimeters_first))
     ((ConfigOptionBool,                 extra_perimeters))
     ((ConfigOptionBool,                 extra_perimeters_on_overhangs))

src/libslic3r/PrintObject.cpp

@@ -748,6 +748,7 @@ bool PrintObject::invalidate_state_by_config_options(
             || opt_key == "support_material_speed"
             || opt_key == "support_material_interface_speed"
             || opt_key == "bridge_speed"
+            || opt_key == "overhang_speed"
             || opt_key == "external_perimeter_speed"
             || opt_key == "infill_speed"
             || opt_key == "perimeter_speed"

src/slic3r/GUI/ConfigManipulation.cpp

@@ -220,7 +220,7 @@ void ConfigManipulation::toggle_print_fff_options(DynamicPrintConfig* config)
     bool have_perimeters = config->opt_int("perimeters") > 0;
     for (auto el : { "extra_perimeters","extra_perimeters_on_overhangs", "ensure_vertical_shell_thickness", "thin_walls", "overhangs",
                     "seam_position","staggered_inner_seams", "external_perimeters_first", "external_perimeter_extrusion_width",
-                    "perimeter_speed", "small_perimeter_speed", "external_perimeter_speed" })
+                    "perimeter_speed", "small_perimeter_speed", "external_perimeter_speed", "overhang_speed" })
         toggle_field(el, have_perimeters);
 
     bool have_infill = config->option<ConfigOptionPercent>("fill_density")->value > 0;

src/slic3r/GUI/PresetHints.cpp

@@ -100,6 +100,7 @@ std::string PresetHints::maximum_volumetric_flow_description(const PresetBundle
     double bridge_flow_ratio                = print_config.opt_float("bridge_flow_ratio");
     double perimeter_speed                  = print_config.opt_float("perimeter_speed");
     double external_perimeter_speed         = print_config.get_abs_value("external_perimeter_speed", perimeter_speed);
+    // double overhang_seed                    = print_config.get_abs_value("overhang_speed", external_perimeter_speed);
     // double gap_fill_speed                   = print_config.opt_bool("gap_fill_enabled") ? print_config.opt_float("gap_fill_speed") : 0.;
     double infill_speed                     = print_config.opt_float("infill_speed");
     double small_perimeter_speed            = print_config.get_abs_value("small_perimeter_speed", perimeter_speed);

src/slic3r/GUI/Tab.cpp

@@ -1541,6 +1541,7 @@ void TabPrint::build()
         optgroup->append_single_option_line("perimeter_speed");
         optgroup->append_single_option_line("small_perimeter_speed");
         optgroup->append_single_option_line("external_perimeter_speed");
+        optgroup->append_single_option_line("overhang_speed");
         optgroup->append_single_option_line("infill_speed");
         optgroup->append_single_option_line("solid_infill_speed");
         optgroup->append_single_option_line("top_solid_infill_speed");