A headphone holder to be mounted at the edge of a desk. This one is for 34mm desk thickness, but I attatched the fusion360 file where all dimensions can be easily changed. Just make sure to undersize the dimension for the desk top by about 0.5mm for the holder to hold onto the desk with the resulting tension.
NOTE: the version in the photo is not the final version from the thing files, it's an earlier draft with some profile edges sharp
I'm very happy with the result, but it's my first design ever, so there's certainly room for improvement.