Bookshelf spool hanger

This thing allows to save some space on your desk by hanging filament spools under a bookshelf. The hanger bars can be also fastened vertically to a wall - I didn't try this configuration but it should works :) They are really tough and should be able to hold a big and heavy spools too.
Designed for the 3 mm screws with a flat (countersunk) head shape.
__Dimensions__ (width x height x length):
- Center: 24 x 13 x 160 mm
- Left / right: 17 x 13 x 160 mm