Anchor solid infill / external_infill_margin -> split with bridged.

xs/src/libslic3r/LayerRegion.cpp

@@ -94,12 +94,13 @@ void LayerRegion::process_external_surfaces(const Layer* lower_layer)
 {
     const Surfaces &surfaces = this->fill_surfaces.surfaces;
     const double margin = scale_(this->region()->config.external_infill_margin.getFloat());
+    const double margin_bridged = scale_(this->region()->config.bridged_infill_margin.getFloat());
     
 #ifdef SLIC3R_DEBUG_SLICE_PROCESSING
     export_region_fill_surfaces_to_svg_debug("3_process_external_surfaces-initial");
 #endif /* SLIC3R_DEBUG_SLICE_PROCESSING */
 
-    // 1) Collect bottom and bridge surfaces, each of them grown by a fixed 3mm offset
+    // 1) Collect bottom and bridge surfaces, each of them grown by a parametrised ~3mm offset
     // for better anchoring.
     // Bottom surfaces, grown.
     Surfaces                    bottom;
@@ -186,8 +187,8 @@ void LayerRegion::process_external_surfaces(const Layer* lower_layer)
                         idx_island = j;
                         break;
                     }
-                // Grown by 3mm.
+                // Grown by bridged_infill_margin.
-                Polygons polys = offset(to_polygons(bridges[i].expolygon), float(margin), EXTERNAL_SURFACES_OFFSET_PARAMETERS);
+                Polygons polys = offset(to_polygons(bridges[i].expolygon), float(margin_bridged), EXTERNAL_SURFACES_OFFSET_PARAMETERS);
                 if (idx_island == -1) {
                     printf("Bridge did not fall into the source region!\r\n");
                 } else {

xs/src/libslic3r/PrintConfig.cpp

@@ -343,9 +343,18 @@ PrintConfigDef::PrintConfigDef()
     def->default_value = new ConfigOptionBool(true);
 
     def = this->add("external_infill_margin", coFloat);
-    def->label = L("Anchor the top by X mm");
+    def->label = L("Default");
     def->category = L("Infill");
-    def->tooltip = L("This parameter grow the top/bottom layers by some mm to anchor them into the part. Put 0 to deactivate it.");
+    def->tooltip = L("This parameter grow the top/bottom/solid layers by some mm to anchor them into the part. Put 0 to deactivate it.");
+    def->sidetext = L("mm");
+    def->cli = "top-layer-anchor=f";
+    def->min = 0;
+    def->default_value = new ConfigOptionFloat(3);
+
+    def = this->add("bridged_infill_margin", coFloat);
+    def->label = L("Bridged");
+    def->category = L("Infill");
+    def->tooltip = L("This parameter grow the bridged solid infill layers by some mm to anchor them into the part. Put 0 to deactivate it.");
     def->sidetext = L("mm");
     def->cli = "top-layer-anchor=f";
     def->min = 0;

xs/src/libslic3r/PrintConfig.hpp

@@ -393,6 +393,7 @@ public:
     ConfigOptionEnum<InfillPattern> bottom_fill_pattern;
     ConfigOptionBool                enforce_full_fill_volume;
     ConfigOptionFloat               external_infill_margin;
+    ConfigOptionFloat               bridged_infill_margin;
     ConfigOptionFloatOrPercent      external_perimeter_extrusion_width;
     ConfigOptionFloatOrPercent      external_perimeter_speed;
     ConfigOptionBool                external_perimeters_first;
@@ -438,6 +439,7 @@ protected:
         OPT_PTR(bottom_fill_pattern);
         OPT_PTR(enforce_full_fill_volume);
         OPT_PTR(external_infill_margin);
+        OPT_PTR(bridged_infill_margin);
         OPT_PTR(external_perimeter_extrusion_width);
         OPT_PTR(external_perimeter_speed);
         OPT_PTR(external_perimeters_first);

xs/src/libslic3r/PrintObject.cpp

@@ -195,6 +195,7 @@ bool PrintObject::invalidate_state_by_config_options(const std::vector<t_config_
             || opt_key == "top_solid_layers"
             || opt_key == "solid_infill_below_area"
             || opt_key == "external_infill_margin"
+            || opt_key == "bridged_infill_margin"
             || opt_key == "infill_extruder"
             || opt_key == "solid_infill_extruder"
             || opt_key == "infill_extrusion_width"
@@ -309,7 +310,7 @@ void PrintObject::_prepare_infill()
     // It produces enlarged overlapping bridging areas.
     //
     // 1) S_TYPE_BOTTOMBRIDGE / S_TYPE_BOTTOM infill is grown by 3mm and clipped by the total infill area. Bridges are detected. The areas may overlap.
-    // 2) S_TYPE_TOP is grown by 3mm and clipped by the grown bottom areas. The areas may overlap.
+    // 2) S_TYPE_TOP is grown by 3mm (or external_infill_margin) and clipped by the grown bottom areas. The areas may overlap.
     // 3) Clip the internal surfaces by the grown top/bottom surfaces.
     // 4) Merge surfaces with the same style. This will mostly get rid of the overlaps.
     //FIXME This does not likely merge surfaces, which are supported by a material with different colors, but same properties.

xs/src/slic3r/GUI/Preset.cpp

@@ -297,7 +297,7 @@ const std::vector<std::string>& Preset::print_options()
         "ooze_prevention", "standby_temperature_delta", "interface_shells", "extrusion_width", "first_layer_extrusion_width", 
         "perimeter_extrusion_width", "external_perimeter_extrusion_width", "infill_extrusion_width", "solid_infill_extrusion_width", 
         "top_infill_extrusion_width", "support_material_extrusion_width", "infill_overlap", "bridge_flow_ratio", 
-        "over_bridge_flow_ratio", "clip_multipart_objects", "enforce_full_fill_volume", "external_infill_margin",
+        "over_bridge_flow_ratio", "clip_multipart_objects", "enforce_full_fill_volume", "external_infill_margin", "bridged_infill_margin",
         "elefant_foot_compensation", "xy_size_compensation", "threads", "resolution", "wipe_tower", "wipe_tower_x", "wipe_tower_y",
         "wipe_tower_width", "wipe_tower_rotation_angle", "wipe_tower_bridging", "only_one_perimeter_top", "compatible_printers",
         "compatible_printers_condition", "inherits", "infill_dense_layers", "infill_dense_density"

xs/src/slic3r/GUI/Tab.cpp

@@ -861,14 +861,17 @@ void TabPrint::build()
         line.append_option(optgroup->get_option("infill_dense_density"));
         optgroup->append_line(line);
 
-		optgroup = page->new_optgroup(_(L("Advanced")));
+        optgroup = page->new_optgroup(_(L("Advanced")));
-		optgroup->append_single_option_line("solid_infill_every_layers");
+        optgroup->append_single_option_line("solid_infill_every_layers");
-		optgroup->append_single_option_line("fill_angle");
+        optgroup->append_single_option_line("solid_infill_below_area");
-		optgroup->append_single_option_line("solid_infill_below_area");
+        optgroup->append_single_option_line("fill_angle");
-		optgroup->append_single_option_line("external_infill_margin");
+        optgroup->append_single_option_line("bridge_angle");
-		optgroup->append_single_option_line("bridge_angle");
+        line = { _(L("Anchor solid infill by X mm")), "" };
-		optgroup->append_single_option_line("only_retract_when_crossing_perimeters");
+        line.append_option(optgroup->get_option("external_infill_margin"));
-		optgroup->append_single_option_line("infill_first");
+        line.append_option(optgroup->get_option("bridged_infill_margin"));
+        optgroup->append_line(line);
+        optgroup->append_single_option_line("only_retract_when_crossing_perimeters");
+        optgroup->append_single_option_line("infill_first");
 
 	page = add_options_page(_(L("Skirt and brim")), "box.png");
 		optgroup = page->new_optgroup(_(L("Skirt")));