This is a wall-mounted headphone hanger.The upper surface is a bit curved so as not to leave permanent prints on headphones with memory-foam pads and the hole is to accommodate the plug or an adaptor. Originally designed for the AKG K550 but I suppose it is suited for most headphones out there.

Designed with 123D design. Along with the .stl file it is included the .123dx file which can be used to effortlessly edit several parameters of the object.

I recommend using PLA for better layer adhesion.
My prints turned out to be extremely strong with 30% infill.

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