Minimal GoPro case I use for FPV, remixed from the ZMR250 Quadcopter case. One standard case and one with a built in 15 degree tilt.
The case includes cutouts for the official GoPro lens protector and the edge overlaps on the front for better frontal protection.
Printed at 1 shell and 10% fill the case weighs about 5 grams.
Fits my GoPro 4 silver but should fit others.