GoPro lens cap
thingiverse
Here's a customizable lens cap for the GoPro. It attaches itself to the rubbery sides by friction-fit, so adjust the clearance until you get it to just the right amount of friction.
Download Model from thingiverse
With this file you will be able to print GoPro lens cap with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on GoPro lens cap.