3d printer dual filament support

This is a filament spool holder designed to hold two spools. It is designed to mount to a 25mm extruded aluminum beam. It uses bearings and 8mm threaded rod to support the spools. The parts I user were:
http://www.amazon.com/Bearing-8x22x7-Shielded-Miniature-Bearings/dp/B002BBI7RE/ref=sr_1_3?s=industrial&ie=UTF8&qid=1389474253&sr=1-3&keywords=608ZZ

http://zorotools.com
Part number: G3706071 Threaded rod
Part number: G3134756 Hex nut

The end spools are friction fit, and fit on the center spools snugly.

I just tie wrapped it to the support beam but I have put screw holes in it if you want to permanently mount it to he beam.