Customizable Spool Holder Base for Different Size Aluminum Extrusions

**Update 11/3/2016**
I added 3 more options to use this with 1/2" EMT (Electrical Metal Tubing), 3/4"EMT or 1/2" PVC so I can use this on an Emmett-Delta.

This is a customizable base for the Universal stand-alone filament spool holder http://www.thingiverse.com/thing:508896

Since I had already done most of the work to make this customizable for 2020 aluminum, I went further and made it customizable for the 6 different extrusions. By changing a few variables in the openscad script, you sh