Based on an original design by Bluebie. http://www.thingiverse.com/thing:100362Learn how to customize your own gimbal at http://designmaketeach.com/2014/05/06/3d-design-personalize-a-gimbal/Printed at 0.2mm layer height on a Metal Printrbot Simple.Please leave a comment or contact me on Twitter @DesignMakeTeach or on Facebook at Facebook.com/DesignMakeTeach. I love to talk with teachers, designers and makers about 3D printing and Learning by Making.This design should print nicely on a Printrbot Metal Simple with no raft or support. Should spin right off the print bed with minimal work. If the rings are fused, try adjusting the filament diameter. I usually start by adding 0.1mm to the measured diameter of the filament I am using. If the filament measure 1.68mm using digital calipers, I will tell me slicing software that the filament diameter is 1.78mm.