Allow to skip the sparse infill "perimeters"

xs/src/libslic3r/Fill/Fill.cpp

@@ -279,6 +279,7 @@ void make_fill(LayerRegion &layerm, ExtrusionEntityCollection &out)
         params.density = 0.01 * density;
         params.dont_adjust = false;
         params.fill_exactly = layerm.region()->config.enforce_full_fill_volume.getBool();
+        params.dont_connect = layerm.region()->config.infill_not_connected.getBool();
 
         // calculate actual flow from spacing (which might have been adjusted by the infill
         // pattern generator)

xs/src/libslic3r/Fill/Fill3DHoneycomb.cpp

@@ -165,7 +165,7 @@ void Fill3DHoneycomb::_fill_surface_single(
     polylines = intersection_pl(polylines, (Polygons)expolygon);
 
     // connect lines
-    if (! params.dont_connect && ! polylines.empty()) { // prevent calling leftmost_point() on empty collections
+    if (! polylines.empty()) { // prevent calling leftmost_point() on empty collections
         ExPolygon expolygon_off;
         {
             ExPolygons expolygons_off = offset_ex(expolygon, SCALED_EPSILON);
@@ -180,7 +180,7 @@ void Fill3DHoneycomb::_fill_surface_single(
             PolylineCollection::leftmost_point(polylines), false); // reverse allowed
         bool first = true;
         for (Polylines::iterator it_polyline = chained.begin(); it_polyline != chained.end(); ++ it_polyline) {
-            if (! first) {
+            if (!params.dont_connect && !first) {
                 // Try to connect the lines.
                 Points &pts_end = polylines_out.back().points;
                 const Point &first_point = it_polyline->points.front();

xs/src/libslic3r/Fill/FillGyroid.cpp

@@ -154,7 +154,7 @@ void FillGyroid::_fill_surface_single(
     polylines = intersection_pl(polylines, (Polygons)expolygon);
 
     // connect lines
-    if (! params.dont_connect && ! polylines.empty()) { // prevent calling leftmost_point() on empty collections
+    if (! polylines.empty()) { // prevent calling leftmost_point() on empty collections
         ExPolygon expolygon_off;
         {
             ExPolygons expolygons_off = offset_ex(expolygon, (float)SCALED_EPSILON);
@@ -169,7 +169,7 @@ void FillGyroid::_fill_surface_single(
             PolylineCollection::leftmost_point(polylines), false); // reverse allowed
         bool first = true;
         for (Polyline &polyline : chained) {
-            if (! first) {
+            if (!params.dont_connect && !first) {
                 // Try to connect the lines.
                 Points &pts_end = polylines_out.back().points;
                 const Point &first_point = polyline.points.front();

xs/src/libslic3r/PrintConfig.cpp

@@ -778,7 +778,7 @@ PrintConfigDef::PrintConfigDef()
     def->default_value = new ConfigOptionPercent(20);
 
     def = this->add("fill_pattern", coEnum);
-    def->label = L("Fill pattern");
+    def->label = L("Pattern");
     def->category = L("Infill");
     def->tooltip = L("Fill pattern for general low-density infill.");
     def->cli = "fill-pattern=s";
@@ -947,6 +947,13 @@ PrintConfigDef::PrintConfigDef()
     def->cli = "infill-dense!";
     def->default_value = new ConfigOptionBool(false);
 
+    def = this->add("infill_not_connected", coBool);
+    def->label = ("Do not connect infill lines to each other.");
+    def->category = L("Infill");
+    def->tooltip = L("If checked, the infill algorithm will try to not connect the lines near the infill. Can be useful for art or with high infill/perimeter overlap.");
+    def->cli = "infill-not-connected!";
+    def->default_value = new ConfigOptionBool(false);
+    
     def = this->add("infill_dense_algo", coEnum);
     def->label = L("Algorithm");
     def->tooltip = L("Choose the way the dense layer is lay out."

xs/src/libslic3r/PrintConfig.hpp

@@ -461,6 +461,7 @@ public:
     ConfigOptionInt                 infill_every_layers;
     ConfigOptionFloatOrPercent      infill_overlap;
     ConfigOptionFloat               infill_speed;
+    ConfigOptionBool                infill_not_connected;
     ConfigOptionBool                infill_dense;
     ConfigOptionEnum<DenseInfillAlgo> infill_dense_algo;
     ConfigOptionBool                infill_first;
@@ -518,6 +519,7 @@ protected:
         OPT_PTR(infill_overlap);
         OPT_PTR(infill_speed);
         OPT_PTR(infill_dense);
+        OPT_PTR(infill_not_connected);
         OPT_PTR(infill_dense_algo);
         OPT_PTR(infill_first);
         OPT_PTR(overhangs);

xs/src/libslic3r/PrintObject.cpp

@@ -206,6 +206,7 @@ bool PrintObject::invalidate_state_by_config_options(const std::vector<t_config_
             || opt_key == "infill_every_layers"
             || opt_key == "solid_infill_every_layers"
             || opt_key == "infill_dense"
+            || opt_key == "infill_not_connected"
             || opt_key == "infill_dense_algo"
             || opt_key == "bottom_solid_layers"
             || opt_key == "top_solid_layers"

xs/src/slic3r/GUI/Preset.cpp

@@ -309,6 +309,7 @@ const std::vector<std::string>& Preset::print_options()
         "infill_dense", "infill_dense_algo", "no_perimeter_unsupported", "min_perimeter_unsupported", "noperi_bridge_only",
         "support_material_solid_first_layer", "perimeter_loop", "perimeter_loop_seam", "seam_travel"
         , "remove_small_gaps"
+        , "infill_not_connected"
     };
     return s_opts;
 }

xs/src/slic3r/GUI/Tab.cpp

@@ -830,15 +830,18 @@ void TabPrint::build()
         line.append_option(optgroup->get_option("perimeter_loop_seam"));
         optgroup->append_line(line);
 
-        page = add_options_page(_(L("Infill")), "infill.png");
+    page = add_options_page(_(L("Infill")), "infill.png");
-		optgroup = page->new_optgroup(_(L("Infill")));
+        optgroup = page->new_optgroup(_(L("Infill")));
-		optgroup->append_single_option_line("fill_density");
+        optgroup->append_single_option_line("fill_density");
-		optgroup->append_single_option_line("fill_pattern");
+        line = { _(L("Inside")), "" };
-		optgroup->append_single_option_line("top_fill_pattern");
+        line.append_option(optgroup->get_option("fill_pattern"));
-		optgroup->append_single_option_line("bottom_fill_pattern");
+        line.append_option(optgroup->get_option("infill_not_connected"));
-		optgroup->append_single_option_line("enforce_full_fill_volume");
+        optgroup->append_line(line);
+        optgroup->append_single_option_line("top_fill_pattern");
+        optgroup->append_single_option_line("bottom_fill_pattern");
+        optgroup->append_single_option_line("enforce_full_fill_volume");
 
-		optgroup = page->new_optgroup(_(L("Reducing printing time")));
+        optgroup = page->new_optgroup(_(L("Reducing printing time")));
         optgroup->append_single_option_line("infill_every_layers");
         optgroup->append_single_option_line("infill_only_where_needed");
         line = { _(L("Suporting dense layer")), "" };

xs/src/slic3r/GUI/Tab.hpp

@@ -330,7 +330,7 @@ public:
 	size_t		m_sys_extruders_count;
 
 	TabPrinter() {}
-	TabPrinter(wxNotebook* parent, bool no_controller) : Tab(parent, _(L("Printer Settings")), "printer", no_controller) {}
+	TabPrinter(wxNotebook* parent, bool no_controller) : Tab(parent, _(L("Hardware Settings")), "printer", no_controller) {}
 	~TabPrinter(){}
 
 	void		build() override;