Anti Backlash Nut in OpenSCAD

UPDATE see: Improved Anti Backlash Nut in OpenSCAD

This anti backlash nut is based on nuts I bought for the HyperCube Evolution (see these nuts in the custom bracket I created here: https://www.thingiverse.com/thing:2630802). Note that an updated and improved version with less backlash can be found here: https://www.thingiverse.com/thing:2649952.

As my Tr8x4 rods have not arrived yet, I designed this nut to play with the anti backlash concept.

Note that this design uses the following li