I did want quick and easy thing to print, so I decided to update my headphone holder to 3d era. Ironically what did seem like the simplest thing ended up needing many iterations to be actually useable.
This should fit both wider headphones like Sennheiser and thigher like Beyerdynamics. It has flat surface where headphones sits and big enough lip so they stay there. It extends far enough from wall so headphones hangs freely and aren't pushing against wall that much. Corners are cut for ease of use and lip prints 45-degree (or 135) perfectly without supports. There is two screw holes that are almost hidden under the thing in standard installations.