This is a rugged, solid case to protect your iPhone. It features a 3D printed hinge to lock your iPhone in more securely and positively than a flexible case, as successfully trialled on the biikparts iPhone bike mount.
Tested - this design functions perfectly, and provides a tough protective skin for iPhone 4 GSM model. The hinge can be difficult to move at first, as the excess powder can clog the moving parts. Either work the powder free or wash it out in water before use.