Supports on the build plate can have a solid bottom interface for better adhesion: #1165

xs/src/libslic3r/GCode.cpp

@@ -2241,6 +2241,10 @@ std::string GCode::extrude_support(const ExtrusionEntityCollection &support_fill
         for (const ExtrusionEntity *ee : support_fills.entities) {
             ExtrusionRole role = ee->role();
             assert(role == erSupportMaterial || role == erSupportMaterialInterface);
+            if (const ExtrusionEntityCollection* coll = dynamic_cast<const ExtrusionEntityCollection*>(ee)) {
+                gcode += extrude_support(*coll);
+                continue;
+            }
             const char  *label = (role == erSupportMaterial) ? support_label : support_interface_label;
             const double speed = (role == erSupportMaterial) ? support_speed : support_interface_speed;
             const ExtrusionPath *path = dynamic_cast<const ExtrusionPath*>(ee);

xs/src/libslic3r/PrintConfig.cpp

@@ -1439,6 +1439,13 @@ PrintConfigDef::PrintConfigDef()
     def = this->add("printer_settings_id", coString);
     def->default_value = new ConfigOptionString("");
 
+    def = this->add("support_material_solid_first_layer", coBool);
+    def->label = L("Solid first layer");
+    def->category = L("Support material");
+    def->tooltip = L("Use a solid layer instead of a raft for the layer that touch the build plate.");
+    def->cli = "support-material-solid-first-layer!";
+    def->default_value = new ConfigOptionBool(false);
+
     def = this->add("raft_layers", coInt);
     def->label = L("Raft layers");
     def->category = L("Support material");

xs/src/libslic3r/PrintConfig.hpp

@@ -349,6 +349,7 @@ public:
     ConfigOptionEnum<SupportMaterialPattern> support_material_pattern;
     ConfigOptionFloat               support_material_spacing;
     ConfigOptionFloat               support_material_speed;
+    ConfigOptionBool                support_material_solid_first_layer;
     ConfigOptionBool                support_material_synchronize_layers;
     ConfigOptionInt                 support_material_threshold;
     ConfigOptionBool                support_material_with_sheath;
@@ -387,6 +388,7 @@ protected:
         OPT_PTR(support_material_pattern);
         OPT_PTR(support_material_spacing);
         OPT_PTR(support_material_speed);
+        OPT_PTR(support_material_solid_first_layer);
         OPT_PTR(support_material_synchronize_layers);
         OPT_PTR(support_material_xy_spacing);
         OPT_PTR(support_material_threshold);

xs/src/libslic3r/PrintObject.cpp

@@ -194,7 +194,8 @@ bool PrintObject::invalidate_state_by_config_options(const std::vector<t_config_
             || opt_key == "support_material_threshold"
             || opt_key == "support_material_with_sheath"
             || opt_key == "dont_support_bridges"
-            || opt_key == "first_layer_extrusion_width") {
+            || opt_key == "first_layer_extrusion_width"
+            || opt_key == "support_material_solid_first_layer") {
             steps.emplace_back(posSupportMaterial);
         } else if (
                opt_key == "interface_shells"

xs/src/libslic3r/SupportMaterial.cpp

@@ -1869,11 +1869,7 @@ static inline void fill_expolygons_generate_paths(
     fill_params.dont_adjust = true;
     for (ExPolygons::const_iterator it_expolygon = expolygons.begin(); it_expolygon != expolygons.end(); ++ it_expolygon) {
         Surface surface(stInternal, *it_expolygon);
-        extrusion_entities_append_paths(
+        filler->fill_surface_extrusion(&surface, fill_params, flow, role, dst);
-            dst,
-            filler->fill_surface(&surface, fill_params),
-            role, 
-            flow.mm3_per_mm(), flow.width, flow.height);
     }
 }
 
@@ -1889,13 +1885,9 @@ static inline void fill_expolygons_generate_paths(
     fill_params.density = density;
     fill_params.complete = true;
     fill_params.dont_adjust = true;
-    for (ExPolygons::iterator it_expolygon = expolygons.begin(); it_expolygon != expolygons.end(); ++ it_expolygon) {
+    for (ExPolygons::iterator it_expolygon = expolygons.begin(); it_expolygon != expolygons.end(); ++it_expolygon) {
         Surface surface(stInternal, std::move(*it_expolygon));
-        extrusion_entities_append_paths(
+        filler->fill_surface_extrusion(&surface, fill_params, flow, role, dst);
-            dst,
-            filler->fill_surface(&surface, fill_params),
-            role,
-            flow.mm3_per_mm(), flow.width, flow.height);
     }
 }
 
@@ -2547,6 +2539,7 @@ void PrintObjectSupportMaterial::generate_toolpaths(
 
             std::unique_ptr<Fill> filler_interface = std::unique_ptr<Fill>(Fill::new_from_type(ipRectilinear));
             std::unique_ptr<Fill> filler_support = std::unique_ptr<Fill>(Fill::new_from_type(infill_pattern));
+            std::unique_ptr<Fill> filler_dense = std::unique_ptr<Fill>(Fill::new_from_type(ipRectiWithPerimeter));
             filler_interface->set_bounding_box(bbox_object);
             filler_support->set_bounding_box(bbox_object);
 
@@ -2599,10 +2592,16 @@ void PrintObjectSupportMaterial::generate_toolpaths(
             float density = 0.f;
             if (support_layer_id == 0) {
                 // Base flange.
+                if (this->m_object_config->support_material_solid_first_layer.value) {
+                    filler = filler_dense.get();
+                    density = 1.f;
+                    filler->angle = 0;
+                } else {
                     filler->angle = raft_angle_1st_layer;
-                filler->spacing = m_first_layer_flow.spacing();
                     // 70% of density on the 1st layer.
                     density = 0.7f;
+                }
+                filler->spacing = m_first_layer_flow.spacing();
             } else if (support_layer_id >= m_slicing_params.base_raft_layers) {
                 filler->angle = raft_angle_interface;
                 // We don't use $base_flow->spacing because we need a constant spacing
@@ -2650,6 +2649,7 @@ void PrintObjectSupportMaterial::generate_toolpaths(
         size_t idx_layer_inteface         = size_t(-1);
         std::unique_ptr<Fill> filler_interface = std::unique_ptr<Fill>(Fill::new_from_type(m_slicing_params.soluble_interface ? ipConcentric : ipRectilinear));
         std::unique_ptr<Fill> filler_support = std::unique_ptr<Fill>(Fill::new_from_type(infill_pattern));
+        std::unique_ptr<Fill> filler_solid = std::unique_ptr<Fill>(Fill::new_from_type(ipRectiWithPerimeter));
         filler_interface->set_bounding_box(bbox_object);
         filler_support->set_bounding_box(bbox_object);
         for (size_t support_layer_id = range.begin(); support_layer_id < range.end(); ++ support_layer_id)
@@ -2722,20 +2722,31 @@ void PrintObjectSupportMaterial::generate_toolpaths(
                     float(layer_ex.layer->height),
                     m_support_material_interface_flow.nozzle_diameter,
                     layer_ex.layer->bridging);
-                filler_interface->angle = interface_as_base ?
+                Fill *filler = filler_interface.get();
+                float density = interface_density;
+                //if first alyer and solid first layer : draw concentric with 100% density
+                if (support_layer.id() == 0 && this->m_object_config->support_material_solid_first_layer.value) {
+                    filler = filler_solid.get();
+                    density = 1.f;
+                    interface_flow = m_first_layer_flow;
+                    filler->angle = 0;
+                    filler->spacing = interface_flow.spacing();
+                } else {
+                    filler->angle = interface_as_base ?
                         // If zero interface layers are configured, use the same angle as for the base layers.
                         angles[support_layer_id % angles.size()] :
                         // Use interface angle for the interface layers.
                         interface_angle;
-                filler_interface->spacing = m_support_material_interface_flow.spacing();
+                    filler->spacing = m_support_material_interface_flow.spacing();
-                filler_interface->link_max_length = coord_t(scale_(filler_interface->spacing * link_max_length_factor / interface_density));
+                    filler->link_max_length = coord_t(scale_(filler_interface->spacing * link_max_length_factor / density));
+                }
                 fill_expolygons_generate_paths(
                     // Destination
                     layer_ex.extrusions, 
                     // Regions to fill
                     union_ex(layer_ex.polygons_to_extrude(), true),
                     // Filler and its parameters
-                    filler_interface.get(), float(interface_density),
+                    filler, float(density),
                     // Extrusion parameters
                     erSupportMaterialInterface, interface_flow);
             }
@@ -2761,16 +2772,21 @@ void PrintObjectSupportMaterial::generate_toolpaths(
                     offset2_ex(base_layer.polygons_to_extrude(), float(SCALED_EPSILON), float(- SCALED_EPSILON)) :
                     offset2_ex(base_layer.polygons_to_extrude(), float(SCALED_EPSILON), float(- SCALED_EPSILON - 0.5*flow.scaled_width()));
                 if (base_layer.layer->bottom_z < EPSILON) {
+                    if (this->m_object_config->support_material_solid_first_layer.value) {
                         // Base flange (the 1st layer).
+                        filler = filler_solid.get();
+                        filler->angle = 0;
+                        density = 1.f;
+                    } else {
                         filler = filler_interface.get();
                         filler->angle = Geometry::deg2rad(float(m_object_config->support_material_angle.value + 90.));
                         density = 0.5f;
-                    flow = m_first_layer_flow;
+                        filler->link_max_length = coord_t(scale_(filler->spacing * link_max_length_factor / density));
+                    }
                     // use the proper spacing for first layer as we don't need to align
                     // its pattern to the other layers
-                    //FIXME When paralellizing, each thread shall have its own copy of the fillers.
+                    flow = m_first_layer_flow;
                     filler->spacing = flow.spacing();
-                    filler->link_max_length = coord_t(scale_(filler->spacing * link_max_length_factor / density));
                 } else if (with_sheath) {
                     // Draw a perimeter all around the support infill. This makes the support stable, but difficult to remove.
                     // TODO: use brim ordering algorithm

xs/src/slic3r/GUI/Preset.cpp

@@ -306,7 +306,7 @@ const std::vector<std::string>& Preset::print_options()
         "elefant_foot_compensation", "xy_size_compensation", "hole_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", "single_extruder_multi_material_priming", "compatible_printers", "compatible_printers_condition", "inherits", 
-        "infill_dense", "no_perimeter_unsupported", "min_perimeter_unsupported", "noperi_bridge_only"
+        "infill_dense", "no_perimeter_unsupported", "min_perimeter_unsupported", "noperi_bridge_only", "support_material_solid_first_layer"
     };
     return s_opts;
 }

xs/src/slic3r/GUI/Tab.cpp

@@ -864,6 +864,7 @@ void TabPrint::build()
 		optgroup->append_single_option_line("support_material_enforce_layers");
 
         optgroup = page->new_optgroup(_(L("Raft")));
+        optgroup->append_single_option_line("support_material_solid_first_layer");
         optgroup->append_single_option_line("raft_layers");
 //		# optgroup->append_single_option_line(get_option_("raft_contact_distance");