From 795a3d06fa48369631649780dbb7b18aac74dec3 Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Sun, 12 Mar 2017 11:02:34 +0100
Subject: [PATCH] Only enable ooze_prevention when print uses more than one
 extruder. #3334

---
 lib/Slic3r/Print/GCode.pm        | 4 ++--
 xs/src/libslic3r/PrintConfig.cpp | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/Slic3r/Print/GCode.pm b/lib/Slic3r/Print/GCode.pm
index cf780e54b..b851f5242 100644
--- a/lib/Slic3r/Print/GCode.pm
+++ b/lib/Slic3r/Print/GCode.pm
@@ -144,12 +144,12 @@ sub export {
     }
     
     # calculate wiping points if needed
-    if ($self->config->ooze_prevention) {
+    if ($self->config->ooze_prevention && (my @extruders = @{$self->print->extruders}) > 1) {
         my @skirt_points = map @$_, map @$_, @{$self->print->skirt};
         if (@skirt_points) {
             my $outer_skirt = convex_hull(\@skirt_points);
             my @skirts = ();
-            foreach my $extruder_id (@{$self->print->extruders}) {
+            foreach my $extruder_id (@extruders) {
                 my $extruder_offset = $self->config->get_at('extruder_offset', $extruder_id);
                 push @skirts, my $s = $outer_skirt->clone;
                 $s->translate(-scale($extruder_offset->x), -scale($extruder_offset->y));  #)
diff --git a/xs/src/libslic3r/PrintConfig.cpp b/xs/src/libslic3r/PrintConfig.cpp
index eb51b6637..a91816d5f 100644
--- a/xs/src/libslic3r/PrintConfig.cpp
+++ b/xs/src/libslic3r/PrintConfig.cpp
@@ -789,7 +789,7 @@ PrintConfigDef::PrintConfigDef()
 
     def = this->add("ooze_prevention", coBool);
     def->label = "Enable";
-    def->tooltip = "This option will drop the temperature of the inactive extruders to prevent oozing. It will enable a tall skirt automatically and move extruders outside such skirt when changing temperatures.";
+    def->tooltip = "During multi-extruder prints, this option will drop the temperature of the inactive extruders to prevent oozing. It will enable a tall skirt automatically and move extruders outside such skirt when changing temperatures.";
     def->cli = "ooze-prevention!";
     def->default_value = new ConfigOptionBool(false);