Thoughts on this lead screw
I'm going to leave this to anyone who's already done any form of a lead screw replacement. I think it was TechMasterJoe that said he had bought some rod to use. Where's he at with his mod?

I think it was either Prusa himself or Triffed Hunter that argues that on a threaded rod Z you ideally have a layer height that is an even number of full steps (not a microstep). I didn't bring up the Prusa calculator, but it seems if you follow that rule you'd end up with some odd layer heights.