ENH: increase auto-arranging spacing to 5mm

Change-Id: Iebf4d31f2f869f11ddb6d9e903dfd446082802d1

src/slic3r/GUI/GLCanvas3D.hpp

@@ -357,8 +357,7 @@ public:
 
     struct ArrangeSettings
     {
-        float distance           = 1.;
-//        float distance_seq_print = 6.;    // Used when sequential print is ON
+        float distance           = 5.;
 //        float distance_sla       = 6.;
         float accuracy           = 0.65f; // Unused currently
         bool  enable_rotation    = false;