FT-5 Modified Spool Holder

http://www.thingiverse.com/thing:1702121 has a slot for a 5/16" rod, which is pretty flimsy to support one roll of filament, let alone two.
I took the design, closed the slot, and put a 20mm hole in its place. Now I can slide a piece of 3/4" EMT metal conduit into the holes and support as many spools as I want!