add "precise_outer_wall"

src/libslic3r/Arachne/BeadingStrategy/BeadingStrategyFactory.cpp

@@ -41,8 +41,8 @@ BeadingStrategyPtr BeadingStrategyFactory::makeStrategy(const coord_t preferred_
         BOOST_LOG_TRIVIAL(trace) << "Applying the Widening Beading meta-strategy with minimum input width " << min_feature_size << " and minimum output width " << min_bead_width << ".";
         ret = std::make_unique<WideningBeadingStrategy>(std::move(ret), min_feature_size, min_bead_width);
     }
-
+    //w39
-    if (outer_wall_offset > 0) {
+    if (outer_wall_offset != 0){//if (outer_wall_offset > 0) {
         BOOST_LOG_TRIVIAL(trace) << "Applying the OuterWallOffset meta-strategy with offset = " << outer_wall_offset << ".";
         ret = std::make_unique<OuterWallInsetBeadingStrategy>(outer_wall_offset, std::move(ret));
     }

src/libslic3r/PerimeterGenerator.cpp

@@ -1298,15 +1298,27 @@ void PerimeterGenerator::process_arachne(
     // extra perimeters for each one
     // detect how many perimeters must be generated for this island
     int        loop_number = params.config.perimeters + surface.extra_perimeters - 1; // 0-indexed loops
-    ExPolygons last        = offset_ex(surface.expolygon.simplify_p(params.scaled_resolution), - float(ext_perimeter_width / 2. - ext_perimeter_spacing / 2.));
+    //w39
+    //ExPolygons last        = offset_ex(surface.expolygon.simplify_p(params.scaled_resolution), - float(ext_perimeter_width / 2. - ext_perimeter_spacing / 2.));
+    double     surface_simplify_resolution = (params.print_config.arc_fitting != ArcFittingType::Disabled &&
+                                          params.config.fuzzy_skin == FuzzySkinType::None) ?
+                                                 0.2 * scale_(params.print_config.resolution) :
+                                                 params.print_config.resolution;
+    auto       apply_precise_outer_wall = params.config.precise_outer_wall && !params.config.external_perimeters_first;
+    ExPolygons last = apply_precise_outer_wall? offset_ex(surface.expolygon.simplify_p(surface_simplify_resolution),
+                                 -float(ext_perimeter_width - ext_perimeter_spacing) ) :offset_ex(surface.expolygon.simplify_p(params.scaled_resolution),
+                                -float(ext_perimeter_width / 2. - ext_perimeter_spacing / 2.));
+    coord_t    wall_0_inset             = 0;
+    if (apply_precise_outer_wall)
+        wall_0_inset = -coord_t(ext_perimeter_width / 2 - ext_perimeter_spacing / 2);
     Polygons   last_p      = to_polygons(last);
 
     //w16
     //w23
     if ((upper_slices == nullptr && params.object_config.top_one_wall_type == TopOneWallType::Onlytopmost)||(params.object_config.only_one_wall_first_layer && layer_id == 0))
         loop_number = 0;
-
+    //w39
-    Arachne::WallToolPaths wallToolPaths(last_p, ext_perimeter_spacing, perimeter_spacing, coord_t(loop_number + 1), 0, params.layer_height, params.object_config, params.print_config);
+    Arachne::WallToolPaths wallToolPaths(last_p, ext_perimeter_spacing, perimeter_spacing, coord_t(loop_number + 1), wall_0_inset, params.layer_height, params.object_config, params.print_config);
     std::vector<Arachne::VariableWidthLines> perimeters = wallToolPaths.getToolPaths();
     loop_number = int(perimeters.size()) - 1;
 
@@ -1583,7 +1595,20 @@ void PerimeterGenerator::process_with_one_wall_arachne(
     //w23
     if (params.object_config.only_one_wall_first_layer && layer_id == 0)
         loop_number = 0;
-    ExPolygons last        = offset_ex(surface.expolygon.simplify_p(params.scaled_resolution), - float(ext_perimeter_width / 2. - ext_perimeter_spacing / 2.));
+    //w39
+    //ExPolygons last        = offset_ex(surface.expolygon.simplify_p(params.scaled_resolution), - float(ext_perimeter_width / 2. - ext_perimeter_spacing / 2.));
+    double     surface_simplify_resolution = (params.print_config.arc_fitting != ArcFittingType::Disabled &&
+                                          params.config.fuzzy_skin == FuzzySkinType::None) ?
+                                                 0.2 * scale_(params.print_config.resolution) :
+                                                 params.print_config.resolution;
+    auto       apply_precise_outer_wall    = params.config.precise_outer_wall && !params.config.external_perimeters_first;
+    ExPolygons last                        = apply_precise_outer_wall ? offset_ex(surface.expolygon.simplify_p(surface_simplify_resolution),
+                                                           -float(ext_perimeter_width - ext_perimeter_spacing)) :
+                                                                        offset_ex(surface.expolygon.simplify_p(params.scaled_resolution),
+                                                           -float(ext_perimeter_width / 2. - ext_perimeter_spacing / 2.));
+    coord_t    wall_0_inset                = 0;
+    if (apply_precise_outer_wall)
+        wall_0_inset = -coord_t(ext_perimeter_width / 2 - ext_perimeter_spacing / 2);
     Polygons   last_p      = to_polygons(last);
 
     int remain_loops = -1;
@@ -1593,8 +1618,8 @@ void PerimeterGenerator::process_with_one_wall_arachne(
 
         loop_number = 0;
     }
-
+    //w39
-    Arachne::WallToolPaths wallToolPaths(last_p, ext_perimeter_spacing, perimeter_spacing, coord_t(loop_number + 1), 0, params.layer_height, params.object_config, params.print_config);
+    Arachne::WallToolPaths wallToolPaths(last_p, ext_perimeter_spacing, perimeter_spacing, coord_t(loop_number + 1), wall_0_inset, params.layer_height, params.object_config, params.print_config);
     std::vector<Arachne::VariableWidthLines> perimeters = wallToolPaths.getToolPaths();
     loop_number = int(perimeters.size()) - 1;
 
@@ -1952,7 +1977,13 @@ void PerimeterGenerator::process_classic(
     // external perimeters
     coord_t ext_perimeter_width     = params.ext_perimeter_flow.scaled_width();
     coord_t ext_perimeter_spacing   = params.ext_perimeter_flow.scaled_spacing();
-    coord_t ext_perimeter_spacing2  = scaled<coord_t>(0.5f * (params.ext_perimeter_flow.spacing() + params.perimeter_flow.spacing()));
+    coord_t ext_perimeter_spacing2; //= scaled<coord_t>(0.5f * (params.ext_perimeter_flow.spacing() + params.perimeter_flow.spacing()));
+    //w39
+    if (params.config.precise_outer_wall && !params.config.external_perimeters_first)
+        ext_perimeter_spacing2 = scaled<coord_t>(0.5f * (params.ext_perimeter_flow.width() + params.perimeter_flow.width()));
+    else
+        ext_perimeter_spacing2 = scaled<coord_t>(0.5f * (params.ext_perimeter_flow.spacing() + params.perimeter_flow.spacing()));
+
     // solid infill
     coord_t solid_infill_spacing    = params.solid_infill_flow.scaled_spacing();
     

src/libslic3r/Preset.cpp

@@ -496,7 +496,9 @@ static std::vector<std::string> s_Preset_print_options {
     //w33
     ,"ironing_pattern"
     //w38
-    ,"overhang_reverse","overhang_reverse_internal_only","overhang_reverse_threshold"};
+    ,"overhang_reverse","overhang_reverse_internal_only","overhang_reverse_threshold"
+    //w39
+    ,"precise_outer_wall"};
 
 static std::vector<std::string> s_Preset_filament_options {
     "filament_colour", "filament_diameter", "filament_type", "filament_soluble", "filament_notes", "filament_max_volumetric_speed",

src/libslic3r/PrintConfig.cpp

@@ -332,6 +332,13 @@ void PrintConfigDef::init_common_params()
     def->mode    = comAdvanced;
     def->set_default_value(new ConfigOptionBool(0));
 
+    //w39
+    def           = this->add("precise_outer_wall", coBool);
+    def->label    = L("Precise wall");
+    def->tooltip  = L("Improve shell precision by adjusting outer wall spacing. This also improves layer consistency.\nNote: This setting "
+                     "will only take effect if the wall sequence is configured to Inner-Outer");
+    def->set_default_value(new ConfigOptionBool{false});
+
     def = this->add("thumbnails", coString);
     def->label = L("G-code thumbnails");
     def->tooltip = L("Picture sizes to be stored into a .gcode / .bgcode and .sl1 / .sl1s files, in the following format: \"XxY/EXT, XxY/EXT, ...\"\n"

src/libslic3r/PrintConfig.hpp

@@ -680,7 +680,8 @@ PRINT_CONFIG_CLASS_DEFINE(
     ((ConfigOptionBool,                 overhang_reverse))
     ((ConfigOptionBool, overhang_reverse_internal_only))
     ((ConfigOptionFloatOrPercent,       overhang_reverse_threshold))
-)
+    //w39
+    ((ConfigOptionBool, precise_outer_wall)))
 
 PRINT_CONFIG_CLASS_DEFINE(
     MachineEnvelopeConfig,

src/libslic3r/PrintObject.cpp

@@ -852,7 +852,9 @@ bool PrintObject::invalidate_state_by_config_options(
             || opt_key == "fuzzy_skin_point_dist"
             || opt_key == "overhangs"
             || opt_key == "thin_walls"
-            || opt_key == "thick_bridges") {
+            || opt_key == "thick_bridges"
+            //w39
+            || opt_key == "precise_outer_wall") {
             steps.emplace_back(posPerimeters);
             steps.emplace_back(posSupportMaterial);
         } else if (opt_key == "bridge_flow_ratio") {

src/slic3r/GUI/Tab.cpp

@@ -1708,6 +1708,7 @@ void TabPrint::build()
         optgroup->append_single_option_line("elefant_foot_compensation_layers");
         //w27
         optgroup->append_single_option_line("precise_z_height");
+        optgroup->append_single_option_line("precise_outer_wall", "Precise-wall");
 
         optgroup = page->new_optgroup(L("Arachne perimeter generator"));
         optgroup->append_single_option_line("wall_transition_angle");
@@ -3032,6 +3033,8 @@ void TabPrinter::build_sla()
     optgroup->append_single_option_line("elefant_foot_min_width");
     //w27
     optgroup->append_single_option_line("precise_z_height");
+    //w39
+    optgroup->append_single_option_line("precise_outer_wall", "Precise-wall");
 
     optgroup->append_single_option_line("gamma_correction");