Polytopal fidget roller
Free

Design consists of two wireframes of polytopes arising from certain tessellations of hyperbolic 3-space, one of them being nested inside the other one, and the outer polytope has had a few edges removed for better viewing. 

Let the inner one spin freely while describing a circular motion with your hand parallel to the ground. Which way does it roll?

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Polytopal fidget roller

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1 downloadable file:

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d_617_in_41_fidget_wm.stl
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~1-5 MB
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