KALLAX Corner headphone holder

!!!it looks like I printed it without exporting the right model, the final model has rounded corners and a lip for the headphones
Quick headphone holder for the KALLAX shelf from ikea. It screws in one of the corners using the existing screws. 

Mounting
You just have to unscrew the corner screw where you want to mount the holder, then just screw it back in through the holder.