Bugfix: solid-infill-below-area wasn't ignored when fill_density = 0, causing solid layers here and there. #1049

lib/Slic3r/Layer/Region.pm

@@ -462,7 +462,7 @@ sub prepare_fill_surfaces {
     }
         
     # turn too small internal regions into solid regions according to the user setting
-    {
+    if ($Slic3r::Config->fill_density > 0) {
         my $min_area = scale scale $Slic3r::Config->solid_infill_below_area; # scaling an area requires two calls!
         my @small = grep $_->surface_type == S_TYPE_INTERNAL && $_->expolygon->contour->area <= $min_area, @{$self->fill_surfaces};
         $_->surface_type(S_TYPE_INTERNALSOLID) for @small;