This is a Hot Shoe / Cold shoe mount to mount a webcam on top of a camera. ¼-20 thread tripod mount.
I used this to mount my webcam for Octoprint on top of my DSLR I'm using for Octolapse within Octoprint. It's very light duty even when printed 100% infill so print a few just in case you break one. The attached .gcode prints 3 copies.
The author hasn't provided the model origin yet.