Universal Filament Spool Holder

This thing is a remix of two already published solutions for a filament spool holder, so first of all the honor goes to the two guys who did the basic designs:

http://www.thingiverse.com/thing:52927
http://www.thingiverse.com/thing:467008

I liked both designs, and as the spool ends of the "Simple Holder" did not fit perfectly to the spools I wanted to use, I thought combining the stands of this solution with the "Spool Holder with Bearings" from the other one would lead to a more universa