diff --git a/lib/Slic3r/ExtrusionPath.pm b/lib/Slic3r/ExtrusionPath.pm
index 3de6396498..95a65c709f 100644
--- a/lib/Slic3r/ExtrusionPath.pm
+++ b/lib/Slic3r/ExtrusionPath.pm
@@ -5,8 +5,8 @@ require Exporter;
 our @ISA = qw(Exporter);
 our @EXPORT_OK = qw(EXTR_ROLE_PERIMETER EXTR_ROLE_EXTERNAL_PERIMETER 
     EXTR_ROLE_CONTOUR_INTERNAL_PERIMETER
-    EXTR_ROLE_FILL EXTR_ROLE_SOLIDFILL EXTR_ROLE_TOPSOLIDFILL EXTR_ROLE_BRIDGE EXTR_ROLE_SKIRT 
-    EXTR_ROLE_SUPPORTMATERIAL EXTR_ROLE_GAPFILL);
+    EXTR_ROLE_FILL EXTR_ROLE_SOLIDFILL EXTR_ROLE_TOPSOLIDFILL EXTR_ROLE_BRIDGE 
+    EXTR_ROLE_INTERNALBRIDGE EXTR_ROLE_SKIRT EXTR_ROLE_SUPPORTMATERIAL EXTR_ROLE_GAPFILL);
 our %EXPORT_TAGS = (roles => \@EXPORT_OK);
 
 use Slic3r::Geometry qw(PI X Y epsilon deg2rad rotate_points);
@@ -30,9 +30,10 @@ use constant EXTR_ROLE_FILL                         => 4;
 use constant EXTR_ROLE_SOLIDFILL                    => 5;
 use constant EXTR_ROLE_TOPSOLIDFILL                 => 6;
 use constant EXTR_ROLE_BRIDGE                       => 7;
-use constant EXTR_ROLE_SKIRT                        => 8;
-use constant EXTR_ROLE_SUPPORTMATERIAL              => 9;
-use constant EXTR_ROLE_GAPFILL                      => 10;
+use constant EXTR_ROLE_INTERNALBRIDGE               => 8;
+use constant EXTR_ROLE_SKIRT                        => 9;
+use constant EXTR_ROLE_SUPPORTMATERIAL              => 10;
+use constant EXTR_ROLE_GAPFILL                      => 11;
 
 use constant PACK_FMT => 'ffca*';
 
diff --git a/lib/Slic3r/Fill.pm b/lib/Slic3r/Fill.pm
index 9040c0233a..86fe5de507 100644
--- a/lib/Slic3r/Fill.pm
+++ b/lib/Slic3r/Fill.pm
@@ -156,11 +156,13 @@ sub make_fill {
             paths => [
                 map Slic3r::ExtrusionPath->pack(
                     polyline => Slic3r::Polyline->new(@$_),
-                    role => ($is_bridge
-                        ? EXTR_ROLE_BRIDGE
-                        : $is_solid
-                            ? ($surface->surface_type == S_TYPE_TOP ? EXTR_ROLE_TOPSOLIDFILL : EXTR_ROLE_SOLIDFILL)
-                            : EXTR_ROLE_FILL),
+                    role => ($surface->surface_type == S_TYPE_INTERNALBRIDGE
+                        ? EXTR_ROLE_INTERNALBRIDGE
+                        : $is_bridge
+                            ? EXTR_ROLE_BRIDGE
+                            : $is_solid
+                                ? ($surface->surface_type == S_TYPE_TOP ? EXTR_ROLE_TOPSOLIDFILL : EXTR_ROLE_SOLIDFILL)
+                                : EXTR_ROLE_FILL),
                     height => $surface->depth_layers * $layerm->height,
                     flow_spacing => $params->{flow_spacing} || (warn "Warning: no flow_spacing was returned by the infill engine, please report this to the developer\n"),
                 ), @paths,
diff --git a/lib/Slic3r/GCode.pm b/lib/Slic3r/GCode.pm
index c3501d4378..52efe6b39c 100644
--- a/lib/Slic3r/GCode.pm
+++ b/lib/Slic3r/GCode.pm
@@ -53,6 +53,7 @@ my %role_speeds = (
     &EXTR_ROLE_SOLIDFILL                    => 'solid_infill',
     &EXTR_ROLE_TOPSOLIDFILL                 => 'top_solid_infill',
     &EXTR_ROLE_BRIDGE                       => 'bridge',
+    &EXTR_ROLE_INTERNALBRIDGE               => 'solid_infill',
     &EXTR_ROLE_SKIRT                        => 'perimeter',
     &EXTR_ROLE_SUPPORTMATERIAL              => 'support_material',
     &EXTR_ROLE_GAPFILL                      => 'gap_fill',
@@ -203,13 +204,13 @@ sub extrude_path {
         $acceleration = $Slic3r::Config->perimeter_acceleration;
     } elsif ($Slic3r::Config->infill_acceleration && $path->is_fill) {
         $acceleration = $Slic3r::Config->infill_acceleration;
-    } elsif ($Slic3r::Config->infill_acceleration && $path->role == EXTR_ROLE_BRIDGE) {
+    } elsif ($Slic3r::Config->infill_acceleration && ($path->role == EXTR_ROLE_BRIDGE || $path->role == EXTR_ROLE_INTERNALBRIDGE)) {
         $acceleration = $Slic3r::Config->bridge_acceleration;
     }
     $gcode .= $self->set_acceleration($acceleration) if $acceleration;
     
     my $area;  # mm^3 of extrudate per mm of tool movement 
-    if ($path->role == EXTR_ROLE_BRIDGE) {
+    if ($path->role == EXTR_ROLE_BRIDGE || $path->role == EXTR_ROLE_INTERNALBRIDGE) {
         my $s = $path->flow_spacing;
         $area = ($s**2) * PI/4;
     } else {