This is a similar design to my slide/rotate fidget. Inner ring is stationary on the finger and the outer ring spins easily. 2 sizes (US sizes 6.5 & 8.5) uploaded. I don't know how these would scale for other ring sizes as the gap between inner and outer ring doesn't really want to be scaled. If anyone is interested, I can upload other sizes.
I printed with rafts, but I don't know if that's necessary.
The author marked this model as their own original creation.