One size fits all headphone mount for a wall. Sticks out 70mm from wall, far enough for large headsets like Sennheiser HD6XX.

Uses a single 3.5mm diameter screw which is on the inside of the shape so that it's not visible. It is countersunk. Simply drill a hole, use a rawl plug and one 3.5mm screw. You might need to manually turn the screw using a screwdriver as a drill will struggle to reach inside this, or use an extension on your drill.

Super thin design so it prints quickly, just 4 lines on a 0.4mm nozzle. Due to curves/shape, stronger than needed, can barely flex the PLA part by hand.

Tested with Sennheiser HD6XX and Bose QC35 II.