Here's a bracket that you use to put your shower pole into so it always goes in the same spot. I got sick of our shower pole always moving and adjusting tightness so it won't slip. This fixes that issue by mounting two of these brackets into the wall. Now my shower pole has a home and it's perfectly placed all the time.

-- Easy to print [I'd make it solid by setting a high wall count].
-- Supports should not be needed. Note: I did have a little stringing on the inside edge. It was cosmetic and I just cut the strings away. You could likely avoid this by using supports.
-- Mounts to wall with standard screws. Make sure you use a screw that is coated, or rated for outdoor use to avoid rust stains.

Fusion360 file and STEP file included in case you need to tweak the dimensions.

Happy printing!