I needed something to hold a hand-towel by my sink, so I created this. If you print it laying down on the bed, no supports are needed. I suggest many perimeters. I used 3.2mm wall thickness (8 perims), and it seems strong enough.

The two pieces should snap together, and the ring can spin. I may make an update where I add another pivot to the rag ring itself, but this is good for now. The picture shows it with a paper-towel, but you get the idea.