Jean-Francois Talbot published a new build:

Read more about this build...

 

Here are the source files, the file upload in the build page would not work.

Enjoy.

Jeff

 

I was able to flex it by hand, without too much force. It might have worked just fine, as you said, there won't be any resistance on the machine's axis.

But I figured, with the back forth motion of the X axis, the last thing I wanted was a slight oscillating X axis support.

Unless someone else builds this out of UHMW, we will likely never know