Replicator 2 Top Mount Filament Spool Holder/Dispenser Upper Deck

So this is derived from my original spool holder (http://www.thingiverse.com/thing:74050) and is an add on.

I recently purchased some PLA from MatterHackers (https://www.matterhackers.com/) and the Pro series spools had centers that were only 0.75in diameter. They would not fit on my previous design as my spools were not wide enough and they had end flanges that would not fit through the MatterHackers spool.

So I designed a simple tube to replace them. I then decided that I wanted as man