Back for novelty ceramic pins or earrings

My daughter loves her ceramic pins but the backs have always been sub-par. They fall off or don't hold tightly enough to keep the pin from spinning. She has a lot of pins that she's collected that she doesn't want to wear from fear of losing them. I modeled some TPU pin backs that are TIGHT. These are made using TPU for AMS for the stiffness. They do NOT come off. They're even so tight that it may take tools to remove them. But they met the desired result.

I provided two plates, one with a single back, one with a set of nine. A single print takes just about 15 minutes; nine takes about half an hour. They're not pretty but they certainly do the job.