The lens of the GoPro is well protected inside it's water tight case.
However the case also has a lens and that one has no protection at all.
To make sure it doesn't get all scratched in the bag, I designed myself a lens cap that friction fits onto the GoPro.
Of cause that cursed Thing-o-Matic failed during the print...twice. So 2x4 layers in the middle of the print are more or less missing.