horizontal spool holder

Design was moved to youmagine:
https://www.youmagine.com/designs/horizontal-spool-holder
I was looking for a easy to make horizontal spool holder. I didn't find one that was as basic as possible, so I gave it a shoot and here is what I came up with. All you need is 8mm diameter hex cap screw and and the standard ball bearing (skate bearing):
8mm inner diameter
22mm outer diameter
7mm height
See it in action:
https://www.youtube.com/watch?v=6grFsrQkbto&feature=youtu.be
P.S.: Upon request I can adapt the diameter of spool holder for different Filament spools.