Overhead Spool Holder For Closet Rod

It's nice to be able to keep spools over the top of a 3D printer but once you have multiple spools it can be a real pain to try and swap out a spool that's in the middle. Have multiple printers using the same closet/shower rod for holding spools? It gets even trickier.

This design enables the use of the closet/shower rod AND allows you to easily switch out a spool.

The spool of filament in the photos is from 3Dom USA: http://www.3domusa.com