This bracket holds up a pair of headphones on a fabric cubicle wall using nothing more than pins to hold it up, and leaving no mark in the cubicle wall when it's removed. It can easily hold up even a fairly hefty pair of headphones.
It requires the metal double-pin piece from an Advantus Panel Wall Clip (http://www.zerbee.com/Products/Advantus-Panel-Wall-Clip__AVT75338.aspx) or similar clip (see picture), which will snap onto it, so that the pointy pins can be used to hook into the fabric of a cubicle wall system. If you don't have those, you could probably modify the design to something you can shove push-pins through, or use some other kind of pins, but those clips are pretty ubiquitous in fabric-cubicle-wall offices.
It's sized to fit most headphones, including the Sony MA Series comfort headphones I use at work.
When 3D-printing, you will need supports because of the part that the pin assembly snaps over. See the pictures to show how the pins get put into place.