A Better Filament Spool - Reel Holder for Makerbot ToM!

A nice easy modular spool holder that allows you to hold from 1 to 4 spools on top of your Thing-o-Matic! I have tried a few holders out there, and I was never fully happy with any of them so I finally broke down and drew one of my own.

Fully printable on ToM.

My favorite spool holder to date was the YAFSH by mikefrisina here http://www.thingiverse.com/thing:12974
But I didn't like how high it stood and it was a bit difficult to change reels out. So I took his dove tail design and made