This is to mount C920 in better angle if you come from something like this: https://www.prusaprinters.org/prints/38920-c920-camera-mount-mk2-mk3smmu2 and don't have the bottom clip :D
Remix of two models here:
For Arm: https://www.prusaprinters.org/prints/5296-camera-mount-for-prusa-i3-mk3mk3s
For mount: https://www.prusaprinters.org/prints/43293-logitech-c920-adapter-for-articulating-camera-moun
I just married them together with a peg that you need to glue inside the top part…
The author remixed this model.