Saw this use-case while setting up Quick-Clip system on my backpack.
Those parts I tried with both PLA and PETG and both seem robust enough for my cases. Did 30% or more infill with Gyroid pattern and everything seems stable.
UPD 2024-06-22
Added ball-joint connector to allow tilting and turning of the camera.
Because I wanted to print in place the nut with the joint - this element requires some supports, though it went out fine for me.
For the other models supports are not needed, but the result might look slightly better with them for ‘quick-clip-go-pro-horizontal’.
Not sure if anyone actually needs this, but when printed I thought it looks kind of cool on the backpack so thought it's worth sharing.
The author remixed this model.
Modified Insta360 case to allow PLA printing and setup.
Besides - just stitching things together in Blender.