New First layer flow ratio option. #182

lib/Slic3r.pm

@@ -74,6 +74,7 @@ our $infill_every_layers    = 1;
 
 # flow options
 our $extrusion_width_ratio  = 0;
+our $first_layer_flow_ratio = 1;
 our $bridge_flow_ratio      = 1;
 our $overlap_factor         = 0.5;
 our $flow_width;

lib/Slic3r/Config.pm

@@ -144,6 +144,11 @@ our $Options = {
         cli     => 'extrusion-width-ratio=f',
         type    => 'f',
     },
+    'first_layer_flow_ratio' => {
+        label   => 'First layer flow ratio',
+        cli     => 'first-layer-flow-ratio=f',
+        type    => 'f',
+    },
     'bridge_flow_ratio' => {
         label   => 'Bridge flow ratio',
         cli     => 'bridge-flow-ratio=f',

lib/Slic3r/Extruder.pm

@@ -146,6 +146,7 @@ sub extrude_path {
         * $area
         * $Slic3r::extrusion_multiplier
         * (4 / (($Slic3r::filament_diameter ** 2) * PI));
+    $e *= $Slic3r::first_layer_flow_ratio if $self->layer->id == 0;
 
     # extrude arc or line
     $self->print_feed_rate(

lib/Slic3r/GUI/SkeinPanel.pm

@@ -60,7 +60,7 @@ sub new {
         },
         extrusion => {
             title => 'Extrusion',
-            options => [qw(extrusion_width_ratio bridge_flow_ratio)],
+            options => [qw(extrusion_width_ratio first_layer_flow_ratio bridge_flow_ratio)],
         },
         output => {
             title => 'Output',

slic3r.pl

@@ -196,6 +196,8 @@ sub usage {
     --extrusion-width-ratio
                         Calculate the extrusion width as the layer height multiplied by
                         this value (> 0, default: calculated automatically)
+    --first-layer-flow-ratio
+                        Multiplier for extrusion of first layer (> 0, default: $Slic3r::first_layer_flow_ratio)
     --bridge-flow-ratio Multiplier for extrusion when bridging (> 0, default: $Slic3r::bridge_flow_ratio)
     
 EOF