You can adjust the color changes in the rings after slicing. I glued the shapes to the ring.
I print with a 0.25mm nozzle, I wondered what fine details it can print. One ring consumes 0.25m to 0.3m of filament.

I recommend a collar around the ring during printing, it holds better on the pad

Please your children or grandchildren, show them the rings, let them choose the one they like best