I like a minimal case, but wanted to have a design on the back.
This one can be printed in PLA as is, no supports, and can just snap on. It's a tight fit, but will fit.
The “Camera Bump" is to help protect the lenses, but is printed separately to avoid supports. The holes in the case and bump will take a bit of filament as alignment aids for gluing.
The button extensions ease button activation, but could be optional if you prefer to use a fingernail.
I wanted the octopus backing, but toyed with a few others. I included a blank edge, and a few alternate backs which could be combined in TinkerCad or whatever, or create your own. Created with OnShape.