I've seen mass-produced ones in various shapes. For instance, stars. OP probably could, not especially complicated.
Notably worse at the act of 'slinking'. Would tangle like no other!
Notably worse at the act of 'slinking'. Would tangle like no other!
For a non-circle that still works for slinky purposes, I'm sure some sort of geometric prism would be cool. Maybe I'll take a crack at it over winter break!