Headphone Hook for 17-18mm desk

Remix from Joni79 in order to better fit my ikea desk of 17mm desk. The piece is done with 18mm opening so that it doesn't scratch the table on insertion and to compensate for any printer misalignment. I added some small Ikea FIXA (Stick-on floor protectors) in order to gain some pressure and make it stay in place while not damaging the desk.