Parametric Spool Holders

I know there are tons of spool holders on here but I thought with all the different spools out there, there is a need for customizable spool holders. Also, I wanted to 'spiff' it up with the ability to dual extrude. I have now made several and use a 1/4-20 bolt to hold down to a board with a T-slot that goes behind my printer.
Using OpenScad, you can specify size of spool, bearings, dual extrude or not... etc

This is my first published OpenScad script. Any comments/suggestions would be appreciated.