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 easy to follow. All the other variables you might want to use openscad on your computer to change.

1. Length of Arm (136 original)
   Len = 136;
2. Height of the Guide Tube Stem
   Ht = 70;
3. Filament Type (1 = 1.75mm, 3 = 3mm or 0 = both)
   Filament_Type = 0;
4. Filament Slotted opening in top (1 = Yes, 0 = No)
   Filament_Slot = 0;
5. Rotation Angle of Guide Tube (negative is clockwise)
   Guide_ZRot = 0;
6. Guide Tube X offset (Not usually needed)
   Guide_X_Offset = 0;
7. Diameter of hole for 1.75mm Filament
   Fil1_OD = 3;
8. Diamenter of hole for 3mm Filament
   Fil3_OD = 4;

The biggest changes I needed to make to get a nice straight path to the extruder were the length of the arm & to rotate the guide tube by 30 degrees clockwise. I originally thought the slotted opening in the top would be nice to be able to slide the filament out easier, but after printing a version with that slot, seems like the filament might come out too easy. I left that variable in there in case someone wants to try that.

I included the openscad file and the stl file I am using on my Folger Tech Kossel.
There are some other minor variables you can also change if you use the openscad file on your computer. I set the defaults in the openscad file to match closely to the original Guide-tube_holder_and_filament_filter.stl file. The variables I changed for my Kossel were:

Len = 116;
Guide_ZRot = -30;

The only other part from this project I need to change is the spool holder base for 2020 so I can use M4 bolts & slotted opening for the bolt on the base. I have essentially already finished this as well as the spindle, centering cone & bearing wheels. I just need to get a nice fit of the spindle on the base. I will upload the other parts I am converting to openscad when I finish them.