Supports on the build plate can have a solid bottom interface for bet…

…ter 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

@@ -1439,11 +1439,18 @@ 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");
  def->tooltip = L("The object will be raised by this number of layers, and support material "
-  "will be generated under it.");
+ "will be generated under it.");
  def->sidetext = L("layers");
  def->cli = "raft-layers=i";
  def->min = 0;

xs/src/libslic3r/PrintConfig.hpp

@@ -349,6 +349,7 @@ class PrintObjectConfig : public StaticPrintConfig
  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 @@ class PrintObjectConfig : public StaticPrintConfig
  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(
- dst,
- filler->fill_surface(&surface, fill_params),
- role, 
- flow.mm3_per_mm(), flow.width, flow.height);
+ filler->fill_surface_extrusion(&surface, fill_params, flow, role, dst);
  }
 }
 
@@ -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(
- dst,
- filler->fill_surface(&surface, fill_params),
- role,
- flow.mm3_per_mm(), flow.width, flow.height);
+ filler->fill_surface_extrusion(&surface, fill_params, flow, role, dst);
  }
 }
 
@@ -2546,7 +2538,8 @@ void PrintObjectSupportMaterial::generate_toolpaths(
  MyLayer &raft_layer = *raft_layers[support_layer_id];
 
  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_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);
 
@@ -2577,7 +2570,7 @@ void PrintObjectSupportMaterial::generate_toolpaths(
  if (! to_infill.empty()) {
  // We don't use $base_flow->spacing because we need a constant spacing
  // value that guarantees that all layers are correctly aligned.
- Fill *filler  = filler_support.get();
+ Fill *filler = filler_support.get();
  filler->angle = raft_angle_base;
  filler->spacing = m_support_material_flow.spacing();
  filler->link_max_length = coord_t(scale_(filler->spacing * link_max_length_factor / support_density));
@@ -2599,10 +2592,16 @@ void PrintObjectSupportMaterial::generate_toolpaths(
  float density = 0.f;
  if (support_layer_id == 0) {
  // Base flange.
- filler->angle = raft_angle_1st_layer;
+ 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;
+ // 70% of density on the 1st layer.
+ density = 0.7f;
+ }
  filler->spacing = m_first_layer_flow.spacing();
- // 70% of density on the 1st layer.
- density = 0.7f;
  } 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
@@ -2649,7 +2648,8 @@ void PrintObjectSupportMaterial::generate_toolpaths(
  size_t idx_layer_intermediate = size_t(-1);
  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_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_interface->link_max_length = coord_t(scale_(filler_interface->spacing * link_max_length_factor / interface_density));
+ filler->spacing = m_support_material_interface_flow.spacing();
+ 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) {
- // Base flange (the 1st layer).
- 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;
+ 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;
+ 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

@@ -863,8 +863,9 @@ void TabPrint::build()
  optgroup->append_single_option_line("support_material_threshold");
  optgroup->append_single_option_line("support_material_enforce_layers");
 
- optgroup = page->new_optgroup(_(L("Raft")));
- optgroup->append_single_option_line("raft_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");
 
  optgroup = page->new_optgroup(_(L("Options for support material and raft")));