New option to disable overhang flow

lib/Slic3r/Config.pm

@@ -594,6 +594,13 @@ our $Options = {
         type    => 'bool',
         default => 1,
     },
+    'adjust_overhang_flow' => {
+        label   => 'Adjust overhang flow',
+        tooltip => 'Experimental option to adjust flow for overhangs (bridge flow will be used).',
+        cli     => 'adjust-overhang-flow!',
+        type    => 'bool',
+        default => 1,
+    },
     'avoid_crossing_perimeters' => {
         label   => 'Avoid crossing perimeters',
         tooltip => 'Optimize travel moves in order to minimize the crossing of perimeters. This is mostly useful with Bowden extruders which suffer from oozing. This feature slows down both the print and the G-code generation.',

lib/Slic3r/GCode.pm

@@ -197,7 +197,7 @@ sub extrude_loop {
     
     my @paths = ();
     # detect overhanging/bridging perimeters
-    if ($extrusion_path->is_perimeter && @{$self->_layer_overhangs}) {
+    if ($Slic3r::Config->adjust_overhang_flow && $extrusion_path->is_perimeter && @{$self->_layer_overhangs}) {
         # get non-overhang paths by subtracting overhangs from the loop
         push @paths,
             $extrusion_path->subtract_expolygons($self->_layer_overhangs);

lib/Slic3r/GUI/Tab.pm

@@ -412,7 +412,7 @@ sub build {
         },
         {
             title => 'Quality (slower slicing)',
-            options => [qw(extra_perimeters avoid_crossing_perimeters start_perimeters_at_concave_points start_perimeters_at_non_overhang thin_walls)],
+            options => [qw(extra_perimeters avoid_crossing_perimeters start_perimeters_at_concave_points start_perimeters_at_non_overhang thin_walls adjust_overhang_flow)],
             lines => [
                 Slic3r::GUI::OptionsGroup->single_option_line('extra_perimeters'),
                 Slic3r::GUI::OptionsGroup->single_option_line('avoid_crossing_perimeters'),
@@ -421,6 +421,7 @@ sub build {
                     options => [qw(start_perimeters_at_concave_points start_perimeters_at_non_overhang)],
                 },
                 Slic3r::GUI::OptionsGroup->single_option_line('thin_walls'),
+                Slic3r::GUI::OptionsGroup->single_option_line('adjust_overhang_flow'),
             ],
         },
         {

slic3r.pl

@@ -278,6 +278,8 @@ $j
     --start-perimeters-at-non-overhang
                         Try to start perimeters at non-overhang points if any (default: no)
     --thin-walls        Detect single-width walls (default: yes)
+    --adjust-overhang-flow
+                        Experimental option to use bridge flow for overhangs (default: yes)
   
    Support material options:
     --support-material  Generate support material for overhangs