That article is a good find.
Very intetesting.
Im using 8mm x 1.25 stainless a2 threaded rod and nuts for my prusa i2 lead screws as i thought they may be better quality as they dont have to be treated to resist rust so no coating of zinc. They do feel smoother to the touch if you wind them through your fingrrs compared to zinc coated mild steal.
With a small dab of lithium grease the seem to do the job well.
Ive also got bearings in a holder at the bottom and metal couplers cut with a spiral to attach them to the motor shaft as i didnt trust the plastic printed coupling.
Like this:
[
www.ebay.co.uk]
I dont think my lead screws are going to drop with that set up.
Gordon