The file is an adapter to attach a ball joint to the rod of the display mount. Thus it is possible to use his camera with 1/4 inch connector as a webcam on the computer.

You need:
-The 3D printed part (adapter)
-A ball head joint with 1/4 inch connection (female at the bottom, male at the top).
-1/4 inch screw
-M3x12 screw
-M3 nut