New --extruder-offset option

README.markdown

@@ -249,6 +249,8 @@ The author of the Silk icon set is Mark James.
         --bridge-flow-ratio Multiplier for extrusion when bridging (> 0, default: 1)
   
        Multiple extruder options:
+        --extruder-offset   Offset of each extruder, if firmware doesn't handle the displacement
+                            (can be specified multiple times, default: 0x0)
         --perimeters-extruder
                             Extruder to use for perimeters (1+, default: 1)
         --infill-extruder   Extruder to use for infill (1+, default: 1)

lib/Slic3r/Config.pm

@@ -110,6 +110,16 @@ our $Options = {
     },
     
     # extruders options
+    'extruder_offset' => {
+        label   => 'Extruder offset',
+        tooltip => 'If your firmware doesn\'t handle the extruder displacement you need the G-code to take it into account. This option lets you specify the displacement of each extruder with respect to the first one. It expects positive coordinates (they will be subtracted from the XY coordinate).',
+        sidetext => 'mm',
+        cli     => 'extruder-offset=s@',
+        type    => 'point',
+        serialize   => sub { join ',', map { join 'x', @$_ } @{$_[0]} },
+        deserialize => sub { [ map [ split /x/, $_ ], (ref $_[0] eq 'ARRAY') ? @{$_[0]} : (split /,/, $_[0]) ] },
+        default => [[0,0]],
+    },
     'nozzle_diameter' => {
         label   => 'Nozzle diameter',
         tooltip => 'This is the diameter of your extruder nozzle (for example: 0.5, 0.35 etc.)',
@@ -818,7 +828,7 @@ sub new_from_cli {
     }
     
     $args{$_} = $Options->{$_}{deserialize}->($args{$_})
-        for grep exists $args{$_}, qw(print_center bed_size duplicate_grid);
+        for grep exists $args{$_}, qw(print_center bed_size duplicate_grid extruder_offset);
     
     return $class->new(%args);
 }

lib/Slic3r/Extruder.pm

@@ -4,6 +4,7 @@ use Moo;
 use Slic3r::Geometry qw(PI);
 
 use constant OPTIONS => [qw(
+    extruder_offset
     nozzle_diameter filament_diameter extrusion_multiplier temperature first_layer_temperature
 )];
 has $_ => (is => 'ro', required => 1) for @{&OPTIONS};

lib/Slic3r/GCode.pm

@@ -295,8 +295,8 @@ sub _G0_G1 {
     
     if ($point) {
         $gcode .= sprintf " X%.${dec}f Y%.${dec}f", 
-            ($point->x * &Slic3r::SCALING_FACTOR) + $self->shift_x, 
-            ($point->y * &Slic3r::SCALING_FACTOR) + $self->shift_y; #**
+            ($point->x * &Slic3r::SCALING_FACTOR) + $self->shift_x - $self->extruder->extruder_offset->[X], 
+            ($point->y * &Slic3r::SCALING_FACTOR) + $self->shift_y - $self->extruder->extruder_offset->[Y]; #**
         $self->last_pos($point);
     }
     if (defined $z && $z != $self->z) {
@@ -315,8 +315,8 @@ sub G2_G3 {
     my $gcode = $orientation eq 'cw' ? "G2" : "G3";
     
     $gcode .= sprintf " X%.${dec}f Y%.${dec}f", 
-        ($point->x * &Slic3r::SCALING_FACTOR) + $self->shift_x, 
-        ($point->y * &Slic3r::SCALING_FACTOR) + $self->shift_y; #**
+        ($point->x * &Slic3r::SCALING_FACTOR) + $self->shift_x - $self->extruder->extruder_offset->[X], 
+        ($point->y * &Slic3r::SCALING_FACTOR) + $self->shift_y - $self->extruder->extruder_offset->[Y]; #**
     
     # XY distance of the center from the start position
     $gcode .= sprintf " I%.${dec}f J%.${dec}f",

lib/Slic3r/GUI/Tab.pm

@@ -611,6 +611,10 @@ sub _build_extruder_pages {
                 title => 'Size',
                 options => ['nozzle_diameter#' . $extruder_idx],
             },
+            {
+                title => 'Position (for multi-extruder printers)',
+                options => ['extruder_offset#' . $extruder_idx],
+            },
         ]);
         $self->{extruder_pages}[$extruder_idx]{disabled} = 0;
     }

slic3r.pl

@@ -291,6 +291,8 @@ $j
     --bridge-flow-ratio Multiplier for extrusion when bridging (> 0, default: $config->{bridge_flow_ratio})
   
    Multiple extruder options:
+    --extruder-offset   Offset of each extruder, if firmware doesn't handle the displacement
+                        (can be specified multiple times, default: 0x0)
     --perimeters-extruder
                         Extruder to use for perimeters (1+, default: 1)
     --infill-extruder   Extruder to use for infill (1+, default: 1)