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I designed and 3d printed a headphone holder. It clips on to the side of my desk and holds my headphones. It’s not really all that exciting, or interesting, but here it is anyway.
It is designed for a 25 mm thick desk. It has a 1.5 mm sheet of rubber on each of the clamping faces to give it grip and not damage the desk. There are two small compression springs that provide clamping force and allow tool free installation.
It’s a nice simple design and works really well. I have one at home and at work. I printed them from black PETG.
Design files and printable STLs are available on Github here
The headphone holder doing it’s job. 
Close up showing the springs and rubber pads. 
