Designed the caps for wall mounting of the metal bar that holds the shower curtain as well as an adapter for those who have 2 pieces of bars instead of a long one (diameter of the metal bar is 23mm). You have to print 2 caps for wall mounting and 1 adapter if needed.
For the material i suggest you use PETG as it will hold better in time to the steam and humidity that's created when you shower.
Enjoy!
The author hasn't provided the model origin yet.