Wall-mountable Adjustable Spool Holder

One of the first things many people print when they get a 3D-Printer is a filament spool holder. There are a lot of models out there on Thingiverse, which mostly are designed to stand on your desk or to be mounted on your printer. But I couldn't find a good one to be mounted directly on a wall, so I decided to design one myself.

The bottom part of the holder has three holes which can be used to fix the holder in place.
The lid consists of three hooks, which snap directly into place, this way