My kids like to play with pipes in the bathtub, so I designed this to use standard 1 1/2" Schedule 40 PVC pipe, and some suction cups I found at the local store. The suction cups snap into the groove in the back, and now I can get pipe for very cheap at the local hardware store for them to hang on the walls of the tub!

Printing settings shouldn't matter, I used 30% in-fill, but I'm sure it could go lower. Resolution probably doesn't matter either.

I included the Sketchup model as well, in case anyone wants to make it better, or for a different sized pipe.