Headphone hook to fit Bose 35 headphones or for that matter most others.
The base is separate from the hook itself, so the hook can be connected in multiple positions.

I have stuck mine under the desk with a 2cmx5cm Powerstrip. The bolt is a 20mm M3.

Fusion 360 file included for your design pleasure.

Print instructions

Category: Audio Print Settings

Printer Brand: Prusa

Printer: I3 MK3S

Rafts: No

Supports: No

Resolution: 0.2mm

Infill: 20%

Filament: Das Filament PLA