This Shower Rings in C-Form (Top-Opened) are suitable for 25mm rods for snap-fit. For other diameters you can calculate and scale this model to fit.
I printed the edgier one with ABS and brim-support on textured plate. The round one (you can find in raw files) is more difficult to print with ABS, I had warping issues with my old ABS and without support. You can try also with other filaments, please share results :).
The author marked this model as their own original creation.