Added option to switch between BoundedRectilinear and Concentric infill for the ensure vertical shell thickness.

src/libslic3r/Fill/FillEnsuring.cpp

@@ -14,7 +14,8 @@ ThickPolylines FillEnsuring::fill_surface_arachne(const Surface *surface, const
     assert(this->print_config != nullptr && this->print_object_config != nullptr && this->print_region_config != nullptr);
 
     const coord_t               scaled_spacing         = scaled<coord_t>(this->spacing);
-    const bool                             is_bounded_rectilinear = true;
+    const EnsuringInfillPattern infill_patter          = this->print_object_config->ensure_vertical_shell_infill;
+    const bool                  is_bounded_rectilinear = infill_patter == EnsuringInfillPattern::eipBoundedRectilinear;
 
     // Perform offset.
     Slic3r::ExPolygons expp = this->overlap != 0. ? offset_ex(surface->expolygon, scaled<float>(this->overlap)) : ExPolygons{surface->expolygon};
@@ -96,7 +97,8 @@ ThickPolylines FillEnsuring::fill_surface_arachne(const Surface *surface, const
                     BOOST_LOG_TRIVIAL(error) << "FillBoundedRectilinear::fill_surface() failed to fill a region.";
                 append(thick_polylines_out, to_thick_polylines(std::move(polylines), scaled<coord_t>(this->spacing)));
             }
-        }
+        } else
+            assert(infill_patter == EnsuringInfillPattern::eipConcentric);
     }
 
     return thick_polylines_out;

src/libslic3r/Preset.cpp

@@ -449,7 +449,7 @@ static std::vector<std::string> s_Preset_print_options {
     "wipe_tower_width", "wipe_tower_rotation_angle", "wipe_tower_brim_width", "wipe_tower_bridging", "single_extruder_multi_material_priming", "mmu_segmented_region_max_width",
     "wipe_tower_no_sparse_layers", "compatible_printers", "compatible_printers_condition", "inherits",
     "perimeter_generator", "wall_transition_length", "wall_transition_filter_deviation", "wall_transition_angle",
-    "wall_distribution_count", "min_feature_size", "min_bead_width"
+    "wall_distribution_count", "min_feature_size", "min_bead_width", "ensure_vertical_shell_infill"
 };
 
 static std::vector<std::string> s_Preset_filament_options {

src/libslic3r/PrintConfig.cpp

@@ -220,6 +220,12 @@ static t_config_enum_values s_keys_map_PerimeterGeneratorType {
 };
 CONFIG_OPTION_ENUM_DEFINE_STATIC_MAPS(PerimeterGeneratorType)
 
+static t_config_enum_values s_keys_map_EnsuringInfillPattern {
+    { "bounded_rectilinear", int(EnsuringInfillPattern::eipBoundedRectilinear) },
+    { "concentric", int(EnsuringInfillPattern::eipConcentric) }
+};
+CONFIG_OPTION_ENUM_DEFINE_STATIC_MAPS(EnsuringInfillPattern)
+
 static void assign_printer_technology_to_unknown(t_optiondef_map &options, PrinterTechnology printer_technology)
 {
     for (std::pair<const t_config_option_key, ConfigOptionDef> &kvp : options)
@@ -3214,6 +3220,18 @@ void PrintConfigDef::init_fff_params()
     def->min = 0;
     def->set_default_value(new ConfigOptionFloatOrPercent(85, true));
 
+    def = this->add("ensure_vertical_shell_infill", coEnum);
+    def->label = L("Ensure vertical shell infill");
+    def->category = L("Layers and Perimeters");
+    def->tooltip = L("Ensure vertical shell infill.");
+    def->enum_keys_map = &ConfigOptionEnum<EnsuringInfillPattern>::get_enum_values();
+    def->enum_values.push_back("bounded_rectilinear");
+    def->enum_values.push_back("concentric");
+    def->enum_labels.push_back(L("Bounded Rectilinear"));
+    def->enum_labels.push_back(L("Concentric"));
+    def->mode = comAdvanced;
+    def->set_default_value(new ConfigOptionEnum<EnsuringInfillPattern>(EnsuringInfillPattern::eipBoundedRectilinear));
+
     // Declare retract values for filament profile, overriding the printer's extruder profile.
     for (const char *opt_key : {
         // floats

src/libslic3r/PrintConfig.hpp

@@ -133,6 +133,11 @@ enum class PerimeterGeneratorType
     Arachne
 };
 
+enum class EnsuringInfillPattern {
+    eipBoundedRectilinear,
+    eipConcentric
+};
+
 enum class GCodeThumbnailsFormat {
     PNG, JPG, QOI
 };
@@ -162,6 +167,8 @@ CONFIG_OPTION_ENUM_DECLARE_STATIC_MAPS(DraftShield)
 CONFIG_OPTION_ENUM_DECLARE_STATIC_MAPS(GCodeThumbnailsFormat)
 CONFIG_OPTION_ENUM_DECLARE_STATIC_MAPS(ForwardCompatibilitySubstitutionRule)
 CONFIG_OPTION_ENUM_DECLARE_STATIC_MAPS(PerimeterGeneratorType)
+CONFIG_OPTION_ENUM_DECLARE_STATIC_MAPS(EnsuringInfillPattern)
+
 
 #undef CONFIG_OPTION_ENUM_DECLARE_STATIC_MAPS
 
@@ -490,6 +497,7 @@ PRINT_CONFIG_CLASS_DEFINE(
     ((ConfigOptionBool,                clip_multipart_objects))
     ((ConfigOptionBool,                dont_support_bridges))
     ((ConfigOptionFloat,               elefant_foot_compensation))
+    ((ConfigOptionEnum<EnsuringInfillPattern>, ensure_vertical_shell_infill))
     ((ConfigOptionFloatOrPercent,      extrusion_width))
     ((ConfigOptionFloat,               first_layer_acceleration_over_raft))
     ((ConfigOptionFloatOrPercent,      first_layer_speed_over_raft))

src/libslic3r/PrintObject.cpp

@@ -751,7 +751,8 @@ bool PrintObject::invalidate_state_by_config_options(
             || opt_key == "wall_transition_angle"
             || opt_key == "wall_distribution_count"
             || opt_key == "min_feature_size"
-            || opt_key == "min_bead_width") {
+            || opt_key == "min_bead_width"
+            || opt_key == "ensure_vertical_shell_infill") {
             steps.emplace_back(posSlice);
         } else if (
                opt_key == "seam_position"

src/slic3r/GUI/Tab.cpp

@@ -1425,6 +1425,7 @@ void TabPrint::build()
         optgroup->append_single_option_line("extra_perimeters", category_path + "extra-perimeters-if-needed");
         optgroup->append_single_option_line("extra_perimeters_on_overhangs", category_path + "extra-perimeters-on-overhangs");
         optgroup->append_single_option_line("ensure_vertical_shell_thickness", category_path + "ensure-vertical-shell-thickness");
+        optgroup->append_single_option_line("ensure_vertical_shell_infill");
         optgroup->append_single_option_line("avoid_curled_filament_during_travels", category_path + "avoid-curled-filament-during-travels");
         optgroup->append_single_option_line("avoid_crossing_perimeters", category_path + "avoid-crossing-perimeters");
         optgroup->append_single_option_line("avoid_crossing_perimeters_max_detour", category_path + "avoid_crossing_perimeters_max_detour");