Simple Wall Mounted Pulley.

UPDATE: Made the overall size a bit slimmer so you can print on the side for increased strength.

Wanted an easy way to hang my backdrops. You'll need 608 bearings (skateboard bearings, you can get like 100 on amazon for $20) and some M6x30 screws and nuts. No supports needed. Best way I've found to seat bearing is use the handle of a screwdriver to tap it in, and that will get it pretty centered.