Fix retraction tests and fix retract_extra_length and lift in multiple extruders environments

lib/Slic3r/Extruder.pm

@@ -14,6 +14,7 @@ has 'id'    => (is => 'rw', required => 1);
 has $_      => (is => 'ro', required => 1) for @{&OPTIONS};
 
 has 'retracted'                 => (is => 'rw', default => sub {0} );
+has 'restart_extra'             => (is => 'rw', default => sub {0} );
 has 'e_per_mm3'                 => (is => 'lazy');
 has 'retract_speed_mm_min'      => (is => 'lazy');
 has '_mm3_per_mm_cache'         => (is => 'ro', default => sub {{}});

lib/Slic3r/GCode.pm

@@ -181,7 +181,7 @@ sub extrude_path {
         if !points_coincide($self->last_pos, $path->points->[0]);
     
     # compensate retraction
-    $gcode .= $self->unretract if $self->extruder->retracted;
+    $gcode .= $self->unretract;
     
     my $area;  # mm^3 of extrudate per mm of tool movement 
     if ($path->role == EXTR_ROLE_BRIDGE) {
@@ -276,7 +276,8 @@ sub retract {
             $gcode .= $self->G1(@$lift);
         }
     }
-    $self->extruder->retracted($self->extruder->retracted + $length + $restart_extra);
+    $self->extruder->retracted($self->extruder->retracted + $length);
+    $self->extruder->restart_extra($restart_extra);
     $self->lifted($self->extruder->retract_lift) if $lift;
     
     # reset extrusion distance during retracts
@@ -297,9 +298,13 @@ sub unretract {
         $self->lifted(0);
     }
     
+    my $to_unretract = $self->extruder->retracted + $self->extruder->restart_extra;
+    if ($to_unretract) {
         $self->speed('retract');
-    $gcode .= $self->G0(undef, undef, $self->extruder->retracted, "compensate retraction");
+        $gcode .= $self->G0(undef, undef, $to_unretract, "compensate retraction");
         $self->extruder->retracted(0);
+        $self->extruder->restart_extra(0);
+    }
     
     return $gcode;
 }

lib/Slic3r/Test.pm

@@ -34,6 +34,7 @@ sub init_print {
     
     my $config = Slic3r::Config->new_from_defaults;
     $config->apply($params{config}) if $params{config};
+    $config->set('gcode_comments', 1) if $ENV{SLIC3R_TESTS_GCODE};
     
     my $print = Slic3r::Print->new(config => $config);
     $print->add_model($model);

t/retraction.t

@@ -1,4 +1,4 @@
-use Test::More tests => 9;
+use Test::More tests => 12;
 use strict;
 use warnings;
 
@@ -19,34 +19,46 @@ my $test = sub {
     my $print = Slic3r::Test::init_print('20mm_cube', config => $conf);
     
     my $tool = 0;
+    my @toolchange_count = (); # track first usages so that we don't expect retract_length_toolchange when extruders are used for the first time
     my @retracted = (1);  # ignore the first travel move from home to first point
     my $lifted = 0;
     my $changed_tool = 0;
+    my $wait_for_toolchange = 0;
     Slic3r::Test::GCodeReader->new(gcode => Slic3r::Test::gcode($print))->parse(sub {
         my ($self, $cmd, $args, $info) = @_;
         
         if ($cmd =~ /^T(\d+)/) {
             $tool = $1;
             $changed_tool = 1;
+            $wait_for_toolchange = 0;
+            $toolchange_count[$tool] //= 0;
+            $toolchange_count[$tool]++;
+        } elsif ($cmd =~ /^G[01]$/ && !$args->{Z}) { # ignore lift taking place after retraction
+            fail 'toolchange happens right after retraction' if $wait_for_toolchange;
         }
         
         if ($info->{dist_Z}) {
             # lift move or lift + change layer
-            if (_eq($info->{dist_Z}, $conf->retract_lift->[$tool])
+            if (_eq($info->{dist_Z}, $print->extruders->[$tool]->retract_lift)
-                || (_eq($info->{dist_Z}, $conf->layer_height + $conf->retract_lift->[$tool]) && $conf->retract_lift->[$tool] > 0)) {
+                || (_eq($info->{dist_Z}, $conf->layer_height + $print->extruders->[$tool]->retract_lift) && $print->extruders->[$tool]->retract_lift > 0)) {
                 fail 'only lifting while retracted' if !$retracted[$tool] && !($conf->g0 && $info->{retracting});
                 $lifted = 1;
             }
             if ($info->{dist_Z} < 0) {
                 fail 'going down only after lifting' if !$lifted;
                 fail 'going down by the same amount of the lift'
-                    if !_eq($info->{dist_Z}, -$conf->retract_lift->[$tool]);
+                    if !_eq($info->{dist_Z}, -$print->extruders->[$tool]->retract_lift);
                 $lifted = 0;
             }
         }
         if ($info->{retracting}) {
-            fail 'retracted by the correct amount'
+            if (_eq(-$info->{dist_E}, $print->extruders->[$tool]->retract_length)) {
-                if !_eq(-$info->{dist_E}, $conf->retract_length->[$tool]);
+                # okay
+            } elsif (_eq(-$info->{dist_E}, $print->extruders->[$tool]->retract_length_toolchange)) {
+                $wait_for_toolchange = 1;
+            } else {
+                fail 'retracted by the correct amount';
+            }
             fail 'combining retraction and travel with G0'
                 if $cmd ne 'G0' && $conf->g0 && ($info->{dist_Z} || $info->{dist_XY});
             $retracted[$tool] = 1;
@@ -54,16 +66,17 @@ my $test = sub {
         if ($info->{extruding}) {
             fail 'only extruding while not lifted' if $lifted;
             if ($retracted[$tool]) {
-                my $expected_amount = $conf->retract_length->[$tool] + $conf->retract_restart_extra->[$tool];
+                my $expected_amount = $print->extruders->[$tool]->retract_length + $print->extruders->[$tool]->retract_restart_extra;
-                if ($changed_tool) {
+                if ($changed_tool && $toolchange_count[$tool] > 1) {
-                    $expected_amount = $conf->retract_length_toolchange->[$tool] + $conf->retract_restart_extra_toolchange->[$tool];
+                    $expected_amount = $print->extruders->[$tool]->retract_length_toolchange + $print->extruders->[$tool]->retract_restart_extra_toolchange;
+                    $changed_tool = 0;
                 }
                 fail 'unretracted by the correct amount'
                     if !_eq($info->{dist_E}, $expected_amount);
                 $retracted[$tool] = 0;
             }
         }
-        if ($info->{travel} && $info->{dist_XY} >= $conf->retract_before_travel->[$tool]) {
+        if ($info->{travel} && $info->{dist_XY} >= $print->extruders->[$tool]->retract_before_travel) {
             fail 'retracted before long travel move' if !$retracted[$tool];
         }
     });