Interior-Mind
Nice!
This simple devious device is designed to be tied to the bottom of one's heel, making it very uncomfortable to put your weight down. The result is the wearer is forced to walk and stand in the same posture as if they were wearing a pair of high heels.
The spikes print dull enough that they won't cause serious injury, but still take care with these. A ribbon or string is plenty to attach them. If you're good with leather a strap could be easily fashioned.
One size should fit all. The print is very simple and should fit any size print bed, the diameter of the circle base is 80mm. I printed with 4 walls and 50% infill, which provides plenty strength. Supports for the arches are recommended.