I modeled this rivet so I can attach trinkets to my Croc shoes.

The model is designed to not require support.

I printed at 0.05 mm in PLA and it took about 18 minutes. I recommend maybe printing at 0.10 mm to avoid the curling you can see in the picture. That or increase the minimum layer time to allow proper cooling.

The last picture shows the rivet glued to the yin yang and popped in the hole.