These are not *quite* surfaces of constant width, but at this scale, the error is insignificant. If all goes well, these should be just 6mm across in essentially all directions. Can they substitute for 6mm ball bearings? I sure don't know.
Thirty-six plump little tetrahedra.
5.098 w x
5.094 d x
2.007 w x
2.006 d x