Remix of Filament Guide Tube to convert to openscad and make Parametric

I have been using the Universal stand-alone filament holder (http://www.thingiverse.com/thing:508896) on my Prusa i3v 10" for quite awhile & wanted to use it on my Folger Tech Kossel, but needed to change some dimensions of the parts. I am converting the parts that I need for my Kossel from this project to openscad, but thought I would start by uploading this as it seems like it could be quite useful for others.

There are quite a few things you can change, but variable 1. thru 8. should be e