Printrbot Simple XL Filament Holder

The Printrbot Simple XL comes with provisions for a roll of filament. Out of the three rolls I currently have not a single one sits on the rollers properly. I wanted something to allow me to quickly change rolls out. That got me thinking - where else in life do people want to quickly and easily change rolls out? Then it hit me - Toilet paper!

I designed this stand to sit on top of the XL and be somewhat held in place by the bearings on top. There is a cutout for the Z screw so it sits fl