This is an adjustable Headphone Rack I made for my Bose headphones. It adjusts to hang vertically as well as horizontally. It has slightly over 90˚ rotation. The base of the handle has 4 screw holes for mounting. I have this hanging by my work desk and I used 3M double sided tape to hang it from a shelf.

You'll need one (5mm Flat Head 12mm in Length). The screw hole should be tight enough to generate thread as you screw the 5mm Screw in.

It's not an easy print I had to use supports to print both of them out. The rack I printed straight up so the supports would be on the bottom and the handle I printed on it's side to strengthen the handle. You don't need supports everywhere just where the print meets the bed.