Mount a headphone holder on a desk wall, in a 90°.

Print Settings

Clamp: 
Supports: Yes, Under the hook. its not alot of support
Resolution: 0.3mm
Infill: 20%
Perimeter: 4
Screw(you need two(2) of it): 
Print in on the head.
Supports: No
Resolution: 0.3mm
Infill: 20%
Perimeter: 4

Filament: PLA

if you need for the oposit wall, mirror the clamp and the screw.
PAY ATTENTION!
the crewing direction will be reversed!