From 619bc4012d29adc13d80e2f4bfe1a74daa3cf3ef Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Sun, 5 Mar 2017 02:13:00 +0100
Subject: [PATCH] Allow to express gap_fill_speed as % over infill_speed

---
 lib/Slic3r/GUI/Tab.pm            | 2 +-
 xs/src/libslic3r/PrintConfig.cpp | 7 ++++---
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/lib/Slic3r/GUI/Tab.pm b/lib/Slic3r/GUI/Tab.pm
index 2d2db52e7..c69bd30d8 100644
--- a/lib/Slic3r/GUI/Tab.pm
+++ b/lib/Slic3r/GUI/Tab.pm
@@ -610,10 +610,10 @@ sub build {
             $optgroup->append_single_option_line('infill_speed');
             $optgroup->append_single_option_line('solid_infill_speed');
             $optgroup->append_single_option_line('top_solid_infill_speed');
+            $optgroup->append_single_option_line('gap_fill_speed');
             $optgroup->append_single_option_line('support_material_speed');
             $optgroup->append_single_option_line('support_material_interface_speed');
             $optgroup->append_single_option_line('bridge_speed');
-            $optgroup->append_single_option_line('gap_fill_speed');
         }
         {
             my $optgroup = $page->new_optgroup('Speed for non-print moves');
diff --git a/xs/src/libslic3r/PrintConfig.cpp b/xs/src/libslic3r/PrintConfig.cpp
index 571b42a73..daf49f1d0 100644
--- a/xs/src/libslic3r/PrintConfig.cpp
+++ b/xs/src/libslic3r/PrintConfig.cpp
@@ -490,9 +490,10 @@ PrintConfigDef::PrintConfigDef()
     def = this->add("gap_fill_speed", coFloat);
     def->label = "Gap fill";
     def->category = "Speed";
-    def->tooltip = "Speed for filling gaps. Since these are usually single lines you might want to use a low speed for better sticking. Set zero for auto.";
-    def->sidetext = "mm/s";
-    def->cli = "gap-fill-speed=f";
+    def->tooltip = "Speed for filling gaps. Since these are usually single lines you might want to use a low speed for better sticking. If expressed as percentage (for example: 80%) it will be calculated on the infill speed setting above. Set zero for auto.";
+    def->sidetext = "mm/s or %";
+    def->cli = "gap-fill-speed=s";
+    def->ratio_over = "infill_speed";
     def->min = 0;
     def->default_value = new ConfigOptionFloat(20);