(Update 15/02/2023: Added a second file with larger cutouts as per a request)
Wanted an easy to use & low profile vertical mount for my Hero 9 Black, so sketched this up in Fusion 360. Should also fit a Hero 10 & 11 as they are the same form factor.
Needs to flex open a little to insert the GoPro - I printed in PLA+ which seems to work fine so I don't think other materials should be an issue, but if your filament is fairly brittle might be better using something like PETG that flexes more.
Print with 100% infill & supports (the top lip/edge shouldn't need supports, only the cutouts and circle mount bit).
The author marked this model as their own original creation.