New option for customization of infill/perimeters overlap. #2459

README.md

@@ -350,6 +350,7 @@ The author of the Silk icon set is Mark James.
                             Set a different extrusion width for top infill
         --support-material-extrusion-width
                             Set a different extrusion width for support material
+        --infill-overlap    Overlap between infill and perimeters (default: 15%)
         --bridge-flow-ratio Multiplier for extrusion when bridging (> 0, default: 1)
     
        Multiple extruder options:

lib/Slic3r.pm

@@ -79,7 +79,7 @@ use constant RESOLUTION             => 0.0125;
 use constant SCALED_RESOLUTION      => RESOLUTION / SCALING_FACTOR;
 use constant SMALL_PERIMETER_LENGTH => (6.5 / SCALING_FACTOR) * 2 * PI;
 use constant LOOP_CLIPPING_LENGTH_OVER_NOZZLE_DIAMETER => 0.15;
-use constant INFILL_OVERLAP_OVER_SPACING  => 0.45;
+use constant INFILL_OVERLAP_OVER_SPACING  => 0.3;
 use constant EXTERNAL_INFILL_MARGIN => 3;
 use constant INSET_OVERLAP_TOLERANCE => 0.4;
 

lib/Slic3r/GUI/Tab.pm

@@ -474,7 +474,7 @@ sub build {
         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
-        bridge_flow_ratio
+        infill_overlap bridge_flow_ratio
         xy_size_compensation threads resolution
     ));
     
@@ -644,6 +644,10 @@ sub build {
             $optgroup->append_single_option_line('top_infill_extrusion_width');
             $optgroup->append_single_option_line('support_material_extrusion_width');
         }
+        {
+            my $optgroup = $page->new_optgroup('Overlap');
+            $optgroup->append_single_option_line('infill_overlap');
+        }
         {
             my $optgroup = $page->new_optgroup('Flow');
             $optgroup->append_single_option_line('bridge_flow_ratio');

lib/Slic3r/Layer/PerimeterGenerator.pm

@@ -316,7 +316,7 @@ sub process {
             for map Slic3r::Surface->new(expolygon => $_, surface_type => S_TYPE_INTERNAL),  # use a bogus surface type
                 @{offset2_ex(
                     [ map @{$_->simplify_p(&Slic3r::SCALED_RESOLUTION)}, @{union_ex(\@last)} ],
-                    -($pspacing/2 + $min_perimeter_infill_spacing/2),
+                    -($pspacing/2 - $self->config->get_abs_value_over('infill_overlap', $pwidth) + $min_perimeter_infill_spacing/2),
                     +$min_perimeter_infill_spacing/2,
                 )};
     }

slic3r.pl

@@ -501,6 +501,7 @@ $j
                         Set a different extrusion width for top infill
     --support-material-extrusion-width
                         Set a different extrusion width for support material
+    --infill-overlap    Overlap between infill and perimeters (default: $config->{infill_overlap})
     --bridge-flow-ratio Multiplier for extrusion when bridging (> 0, default: $config->{bridge_flow_ratio})
   
    Multiple extruder options:

xs/src/libslic3r/PrintConfig.cpp

@@ -429,6 +429,14 @@ PrintConfigDef::build_def() {
     Options["infill_only_where_needed"].tooltip = "This option will limit infill to the areas actually needed for supporting ceilings (it will act as internal support material).";
     Options["infill_only_where_needed"].cli = "infill-only-where-needed!";
 
+    Options["infill_overlap"].type = coFloatOrPercent;
+    Options["infill_overlap"].label = "Infill/perimeters overlap";
+    Options["infill_overlap"].category = "Advanced";
+    Options["infill_overlap"].tooltip = "This setting applies an additional overlap between infill and perimeters for better bonding. Theoretically this shouldn't be needed, but backlash might cause gaps. If expressed as percentage (example: 15%) it is calculated over perimeter extrusion width.";
+    Options["infill_overlap"].sidetext = "mm or %";
+    Options["infill_overlap"].cli = "infill-overlap=s";
+    Options["infill_overlap"].ratio_over = "perimeter_extrusion_width";
+
     Options["infill_speed"].type = coFloat;
     Options["infill_speed"].label = "Infill";
     Options["infill_speed"].category = "Speed";

xs/src/libslic3r/PrintConfig.hpp

@@ -224,6 +224,7 @@ class PrintRegionConfig : public virtual StaticPrintConfig
     ConfigOptionInt                 infill_extruder;
     ConfigOptionFloatOrPercent      infill_extrusion_width;
     ConfigOptionInt                 infill_every_layers;
+    ConfigOptionFloatOrPercent      infill_overlap;
     ConfigOptionFloat               infill_speed;
     ConfigOptionBool                overhangs;
     ConfigOptionInt                 perimeter_extruder;
@@ -260,6 +261,8 @@ class PrintRegionConfig : public virtual StaticPrintConfig
         this->infill_extrusion_width.value                       = 0;
         this->infill_extrusion_width.percent                     = false;
         this->infill_every_layers.value                          = 1;
+        this->infill_overlap.value                               = 15;
+        this->infill_overlap.percent                             = true;
         this->infill_speed.value                                 = 80;
         this->overhangs.value                                    = true;
         this->perimeter_extruder.value                           = 1;
@@ -300,6 +303,7 @@ class PrintRegionConfig : public virtual StaticPrintConfig
         if (opt_key == "infill_extruder")                            return &this->infill_extruder;
         if (opt_key == "infill_extrusion_width")                     return &this->infill_extrusion_width;
         if (opt_key == "infill_every_layers")                        return &this->infill_every_layers;
+        if (opt_key == "infill_overlap")                             return &this->infill_overlap;
         if (opt_key == "infill_speed")                               return &this->infill_speed;
         if (opt_key == "overhangs")                                  return &this->overhangs;
         if (opt_key == "perimeter_extruder")                         return &this->perimeter_extruder;

xs/src/libslic3r/PrintObject.cpp

@@ -218,6 +218,7 @@ PrintObject::invalidate_state_by_config_options(const std::vector<t_config_optio
             || *opt_key == "overhangs"
             || *opt_key == "first_layer_extrusion_width"
             || *opt_key == "perimeter_extrusion_width"
+            || *opt_key == "infill_overlap"
             || *opt_key == "thin_walls"
             || *opt_key == "external_perimeters_first") {
             steps.insert(posPerimeters);