Finished the extruder assembly.

I really like printing in nylon.  It's just gorgeous.   I might try dying it later.

So that puts the mass of the extruder stepper on the centerline of the push-rod, about 1/3 of the way up it now.

Not being 1/2 way up means it will move some when the print head moves, but this position keeps the majority of the mass in the center of the upper rails most of the time too (when the print head moves up).

The completed push rod assembly.

The bowden tube is a virtually straight shot and my U joint still bends perfectly.

My source code is getting a bit messy.  I started putting numbers directly in the code instead of using variables as I'm out of time.  I'll have to go back and clean it up later.

New source is up on Github.