Spiky shapes that hurt you - Stim toy?

Simple shapes that, when printed small, can be rolled around in your hand. Some say it feels nice! Others say it hurts you. If you print them big, they could be cool geometric decorations.

Dodeca.stl is a dodecahedron (D12) with pyramids instead of faces. Shape.stl is an icosahedron (D20) and a dodecahedron fused together.

The smooth models have rounded corners (best seen when printed large, like the pink one in the picture), and the sharp ones don't. I felt no discernible difference between the two when printing them at a small scale, though.

Print with supports.