It allows fixing the camera to the guitar head
One of the parts needs support. I printed it at 0.15mm layer height, 20% infill and it works ok. Screw may benefit of a more dense infill (reprint only if the first one breaks :-)
Please note this is a mash-up of an existing design off thingiverse: https://www.thingiverse.com/thing:2194278
The author hasn't provided the model origin yet.