A simple headphone holder meant to be mounted on the edge of a desk. Model is designed for a 18.5mm thick desk and a Gorilla mounting tape square, but the design should hopefully be easily modifiable through the STEP file if you have slightly different needs.

If your desk doesn't happen to be 18.5mm thick, you can change the thickness by using the process shared by @JayPea3 in the comments! If you have digital calipers just measure how thick the top of your desk is, and then use the ruler tool to adjust it. Please see attached photo on how to quickly modify the print for your desk size.