From a86c48d85c71e45c6f710d2cf06bec0152b29bf0 Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Mon, 13 May 2013 21:55:34 +0200
Subject: [PATCH] Disable retract on layer change when doing spiral vase; also
 check that we're printing a single-material object

---
 lib/Slic3r/Print.pm | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/Slic3r/Print.pm b/lib/Slic3r/Print.pm
index 1d84ad640..77ee41e0f 100644
--- a/lib/Slic3r/Print.pm
+++ b/lib/Slic3r/Print.pm
@@ -70,6 +70,7 @@ sub _trigger_config {
         $self->config->set('fill_density', 0);
         $self->config->set('top_solid_layers', 0);
         $self->config->set('support_material', 0);
+        $self->config->set('retract_layer_change', [0]);  # TODO: only apply this to the spiral layers
     }
 }
 
@@ -197,6 +198,9 @@ sub validate {
         if ((map @{$_->copies}, @{$self->objects}) > 1) {
             die "The Spiral Vase option can only be used when printing a single object.\n";
         }
+        if (@{$self->regions} > 1) {
+            die "The Spiral Vase option can only be used when printing single material objects.\n";
+        }
     }
 }