Dual extruder for support material

lib/Slic3r.pm

@@ -97,6 +97,7 @@ our $solid_fill_pattern = 'rectilinear';
 our $fill_density       = 0.4;  # 1 = 100%
 our $fill_angle         = 45;
 our $support_material   = 0;
+our $support_material_tool = 0;
 our $start_gcode = "G28 ; home all axes";
 our $end_gcode = <<"END";
 M104 S0 ; turn off temperature

lib/Slic3r/Config.pm

@@ -220,6 +220,13 @@ our $Options = {
         cli     => 'support-material',
         type    => 'bool',
     },
+    'support_material_tool' => {
+        label   => 'Tool used to extrude support material',
+        cli     => 'support-material-tool=i',
+        type    => 'select',
+        values  => [0,1],
+        labels  => [qw(Primary Secondary)],
+    },
     'start_gcode' => {
         label   => 'Start GCODE',
         cli     => 'start-gcode=s',

lib/Slic3r/Extruder.pm

@@ -326,4 +326,11 @@ sub _Gx {
     return "$gcode\n";
 }
 
+sub set_tool {
+    my $self = shift;
+    my ($tool) = @_;
+    
+    return sprintf "T%d%s\n", $tool, ($Slic3r::gcode_comments ? ' ; change tool' : '');
+}
+
 1;

lib/Slic3r/GUI/SkeinPanel.pm

@@ -41,7 +41,7 @@ sub new {
         },
         print => {
             title => 'Print settings',
-            options => [qw(perimeters solid_layers fill_density fill_angle fill_pattern solid_fill_pattern support_material)],
+            options => [qw(perimeters solid_layers fill_density fill_angle fill_pattern solid_fill_pattern support_material support_material_tool)],
         },
         retract => {
             title => 'Retraction',

lib/Slic3r/Print.pm

@@ -566,6 +566,9 @@ sub export_gcode {
     
     # set up our extruder object
     my $extruder = Slic3r::Extruder->new;
+    if ($Slic3r::support_material && $Slic3r::support_material_tool > 0) {
+        print $fh $extruder->set_tool(0);
+    }
     
     # write gcode commands layer by layer
     foreach my $layer (@{ $self->layers }) {
@@ -594,8 +597,12 @@ sub export_gcode {
             
             # extrude support material
             if ($layer->support_fills) {
+                print $fh $extruder->set_tool($Slic3r::support_material_tool)
+                    if $Slic3r::support_material_tool > 0;
                 print $fh $extruder->extrude_path($_, 'support material') 
                     for $layer->support_fills->shortest_path($extruder->last_pos);
+                print $fh $extruder->set_tool(0)
+                    if $Slic3r::support_material_tool > 0;
             }
         }
     }