diff --git a/README.markdown b/README.markdown
index ffebd1481..95c565c98 100644
--- a/README.markdown
+++ b/README.markdown
@@ -300,6 +300,8 @@ The author of the Silk icon set is Mark James.
                             Set a different extrusion width for perimeters
         --infill-extrusion-width
                             Set a different extrusion width for infill
+        --solid-infill-extrusion-width
+                            Set a different extrusion width for solid infill
         --top-infill-extrusion-width
                             Set a different extrusion width for top infill
         --support-material-extrusion-width
diff --git a/lib/Slic3r/Config.pm b/lib/Slic3r/Config.pm
index 1bd9657a0..b7833462f 100644
--- a/lib/Slic3r/Config.pm
+++ b/lib/Slic3r/Config.pm
@@ -446,8 +446,16 @@ our $Options = {
         type    => 'f',
         default => 0,
     },
+    'solid_infill_extrusion_width' => {
+        label   => 'Solid infill',
+        tooltip => 'Set this to a non-zero value to set a manual extrusion width for infill for solid surfaces. If expressed as percentage (for example 90%) if will be computed over layer height.',
+        sidetext => 'mm or % (leave 0 for default)',
+        cli     => 'solid-infill-extrusion-width=s',
+        type    => 'f',
+        default => 0,
+    },
     'top_infill_extrusion_width' => {
-        label   => 'Top infill',
+        label   => 'Top solid infill',
         tooltip => 'Set this to a non-zero value to set a manual extrusion width for infill for top surfaces. You may want to use thinner extrudates to fill all narrow regions and get a smoother finish. If expressed as percentage (for example 90%) if will be computed over layer height.',
         sidetext => 'mm or % (leave 0 for default)',
         cli     => 'top-infill-extrusion-width=s',
diff --git a/lib/Slic3r/Fill.pm b/lib/Slic3r/Fill.pm
index 85c189cfe..9040c0233 100644
--- a/lib/Slic3r/Fill.pm
+++ b/lib/Slic3r/Fill.pm
@@ -100,7 +100,7 @@ sub make_fill {
     
     # add spacing between surfaces
     {
-        my $distance = $layerm->infill_flow->scaled_spacing / 2;
+        my $distance = $layerm->solid_infill_flow->scaled_spacing / 2;
         @surfaces = map $_->offset(-$distance), @surfaces;
     }
     
@@ -109,9 +109,12 @@ sub make_fill {
     SURFACE: foreach my $surface (@surfaces) {
         my $filler          = $Slic3r::Config->fill_pattern;
         my $density         = $Slic3r::Config->fill_density;
-        my $flow_spacing    = ($surface->surface_type == S_TYPE_TOP)
-            ? $layerm->top_infill_flow->spacing
-            : $layerm->infill_flow->spacing;
+        my $flow            = ($surface->surface_type == S_TYPE_TOP)
+            ? $layerm->top_infill_flow
+            : $surface->is_solid
+                ? $layerm->solid_infill_flow
+                : $layerm->infill_flow;
+        my $flow_spacing    = $flow->spacing;
         my $is_bridge       = $layerm->id > 0 && $surface->is_bridge;
         my $is_solid        = $surface->is_solid;
         
diff --git a/lib/Slic3r/GUI/Tab.pm b/lib/Slic3r/GUI/Tab.pm
index fa10383e5..8fdacf6f6 100644
--- a/lib/Slic3r/GUI/Tab.pm
+++ b/lib/Slic3r/GUI/Tab.pm
@@ -511,7 +511,7 @@ sub build {
         {
             title => 'Extrusion width',
             label_width => 180,
-            options => [qw(extrusion_width first_layer_extrusion_width perimeter_extrusion_width infill_extrusion_width top_infill_extrusion_width support_material_extrusion_width)],
+            options => [qw(extrusion_width first_layer_extrusion_width perimeter_extrusion_width infill_extrusion_width solid_infill_extrusion_width top_infill_extrusion_width support_material_extrusion_width)],
         },
         {
             title => 'Flow',
diff --git a/lib/Slic3r/Layer/Region.pm b/lib/Slic3r/Layer/Region.pm
index 1c365dd42..fd9b187eb 100644
--- a/lib/Slic3r/Layer/Region.pm
+++ b/lib/Slic3r/Layer/Region.pm
@@ -16,6 +16,7 @@ has 'layer' => (
 has 'region'            => (is => 'ro', required => 1, handles => [qw(extruders)]);
 has 'perimeter_flow'    => (is => 'rw');
 has 'infill_flow'       => (is => 'rw');
+has 'solid_infill_flow' => (is => 'rw');
 has 'top_infill_flow'   => (is => 'rw');
 has 'infill_area_threshold' => (is => 'lazy');
 has 'overhang_width'    => (is => 'lazy');
@@ -59,15 +60,15 @@ sub _update_flows {
     return if !$self->region;
     
     if ($self->id == 0) {
-        $self->perimeter_flow
-            ($self->region->first_layer_flows->{perimeter} || $self->region->flows->{perimeter});
-        $self->infill_flow
-            ($self->region->first_layer_flows->{infill} || $self->region->flows->{infill});
-        $self->top_infill_flow
-            ($self->region->first_layer_flows->{top_infill} || $self->region->flows->{top_infill});
+        for (qw(perimeter infill solid_infill top_infill)) {
+            my $method = "${_}_flow";
+            $self->$method
+                ($self->region->first_layer_flows->{$_} || $self->region->flows->{$_});
+        } 
     } else {
         $self->perimeter_flow($self->region->flows->{perimeter});
         $self->infill_flow($self->region->flows->{infill});
+        $self->solid_infill_flow($self->region->flows->{solid_infill});
         $self->top_infill_flow($self->region->flows->{top_infill});
     }
 }
@@ -80,7 +81,7 @@ sub _build_overhang_width {
 
 sub _build_infill_area_threshold {
     my $self = shift;
-    return $self->infill_flow->scaled_spacing ** 2;
+    return $self->solid_infill_flow->scaled_spacing ** 2;
 }
 
 # build polylines from lines
@@ -160,7 +161,7 @@ sub make_perimeters {
     my $self = shift;
     
     my $perimeter_spacing   = $self->perimeter_flow->scaled_spacing;
-    my $infill_spacing      = $self->infill_flow->scaled_spacing;
+    my $infill_spacing      = $self->solid_infill_flow->scaled_spacing;
     my $gap_area_threshold = $self->perimeter_flow->scaled_width ** 2;
     
     # this array will hold one arrayref per original surface (island);
diff --git a/lib/Slic3r/Print.pm b/lib/Slic3r/Print.pm
index 0753a2768..0ee365074 100644
--- a/lib/Slic3r/Print.pm
+++ b/lib/Slic3r/Print.pm
@@ -201,8 +201,9 @@ sub init_extruders {
         my $region = $self->regions->[$region_id];
         
         # per-role extruders and flows
-        for (qw(perimeter infill top_infill)) {
-            my $extruder_name = $_ eq 'top_infill' ? 'infill' : $_;
+        for (qw(perimeter infill solid_infill top_infill)) {
+            my $extruder_name = $_;
+            $extruder_name =~ s/^(?:solid|top)_//;
             $region->extruders->{$_} = ($self->regions_count > 1)
                 ? $self->extruders->[$extruder_mapping{$region_id}]
                 : $self->extruders->[$self->config->get("${extruder_name}_extruder")-1];
diff --git a/lib/Slic3r/Print/Object.pm b/lib/Slic3r/Print/Object.pm
index 6f47a7808..0431de756 100644
--- a/lib/Slic3r/Print/Object.pm
+++ b/lib/Slic3r/Print/Object.pm
@@ -581,7 +581,7 @@ sub discover_horizontal_shells {
                     # make sure the new internal solid is wide enough, as it might get collapsed when
                     # spacing is added in Fill.pm
                     {
-                        my $margin = 3 * $layerm->infill_flow->scaled_width; # require at least this size
+                        my $margin = 3 * $layerm->solid_infill_flow->scaled_width; # require at least this size
                         my $too_narrow = diff_ex(
                             [ map @$_, @$new_internal_solid ],
                             [ offset([ offset([ map @$_, @$new_internal_solid ], -$margin) ], +$margin) ],
@@ -708,12 +708,12 @@ sub combine_infill {
                 # so let's remove those areas from all layers
                 
                 my @intersection_with_clearance = map $_->offset(
-                      $layerms[-1]->infill_flow->scaled_width    / 2
+                      $layerms[-1]->solid_infill_flow->scaled_width    / 2
                     + $layerms[-1]->perimeter_flow->scaled_width / 2
                     # Because fill areas for rectilinear and honeycomb are grown 
                     # later to overlap perimeters, we need to counteract that too.
                     + (($type == S_TYPE_INTERNALSOLID || $Slic3r::Config->fill_pattern =~ /(rectilinear|honeycomb)/)
-                      ? $layerms[-1]->infill_flow->scaled_width * &Slic3r::PERIMETER_INFILL_OVERLAP_OVER_SPACING
+                      ? $layerms[-1]->solid_infill_flow->scaled_width * &Slic3r::PERIMETER_INFILL_OVERLAP_OVER_SPACING
                       : 0)
                     ), @$intersection;
                 
diff --git a/slic3r.pl b/slic3r.pl
index c4cfd8487..5c5c80b16 100755
--- a/slic3r.pl
+++ b/slic3r.pl
@@ -353,6 +353,8 @@ $j
                         Set a different extrusion width for perimeters
     --infill-extrusion-width
                         Set a different extrusion width for infill
+    --solid-infill-extrusion-width
+                        Set a different extrusion width for solid infill
     --top-infill-extrusion-width
                         Set a different extrusion width for top infill
     --support-material-extrusion-width