I just felt like throwing together something that would be impossible to manufacture with traditional injection molding. I'm sure someone else has done something like this before but I'm just messing around with this new toy.
Prints fine on Makerbot Replicator Dual with 10% infill, although there's a bit more grip than I'd like between the layers. Concentric spinny thing
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4.8 w x
4.79 d x
1.89 w x
1.886 d x