This is a simple headphone rest that mounts underneath the desk. I've seen cool designs on thingiverse for headphone stands, but those take precious desk space. I've seen cool designs on thingiverse for headphone hooks, but almost all of them mount to your desk with a clip that is desk width specific, might slip off, and again, result in a slightly reduction to desk space. This design mounts only to the bottom of the desk with two screws. It's surprisingly strong.

The screw holes are for US standard #6 sheet metal or wood screws. The thread doesn't need to bite into the hole, so the holes are slightly oversized (4mm diameter). I included the step file if you need to remix for your screw size.

Drill pilot holes in your desk, but be careful not to drill through your desk! I used US #6 sheet metal screws with washers.