https://www.instructables.com/Reuleaux-Tetrahedron-Fidget-Spinner/
Reuleaux Tetrahedron Fidget Spinner - Instructables
Reuleaux Tetrahedron Fidget Spinner: Instead of marbles this design uses reuleaux/meissner tetrahedrons to weight the edges. cool because while they have...
reuleaux tetrahedronfidget spinnerinstructables