A couple of simple shower caddies I made because I needed them. I printed the single for myself and the double for my S/O; she seems to need the extra space. Both versions will hold a standard sized bar of soap as well as various other accoutrements. Check them out, maybe they'll work for you.

Print settings I recommend:

Line height: .2 - .32 Top / Bottom / Walls: 3 Infill: 10%