When installing the Z stage threaded rods I noticed that one of them was particularly warped.  Overall, this hasn’t had much of an effect on my prints.  I put the warp-ier part end of the threaded rod down and this reduced the effect of the warp.  This lead to a visible shift in a layer about every 11mm or so.

I raised the warped threaded rod slightly in order to add Zaggo‘s Z axis crank.  However, I’ve discovered that this has apparently introduced more of the warped section of the threaded rod.  Now I’m seeing a visible shift in the layers every 1mm!

Non-ideal.

The Z axis crank is ridiculously useful, so I’ll need to lower the warped rod and raise one of the others.