Headphone holder that can be printed in one piece and can be mounted using two screws. There is an added hole where most screwdrivers should fit through. 

Screw hole size: 5mm diameter

Screw head size: 10mm diameter

Screwdriver hole size: 11mm diameter [ fits LTT screwdriver ;) ]

The holder was designed for a Sony wh-100mx5, so headphones with wide headbands might not fit well. 

Standard Bambulab settings with 20% infill and supports enabled.