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Knuckle roller — image 1
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Knuckle roller

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A 3D printer friendly version of a knuckle roller.  The flat ends make it easy to print and I have not noticed any impact on playability.  I like to print in harder TPU.  Other materials work fine, but PLA may crack at the center when dropped hard.  

I print these as all wall loops, but you may prefer lighter.  Mine tend to come out around 15g depending on material.