Based on an original design by Bluebie. http://www.thingiverse.com/thing:100362
Learn 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.
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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.