Post date: May 18, 2013 5:23:55 AM
Of two kinds!
Firstly, I did my best to measure the runout of the spindle, and it looks like it is, as advertised, around 0.0002" (if that). So I'm cautiously optimistic that this will finally get things working for me.
Second, I did a bunch of messing around with the configuration of my driver board/software. My steppers are running smoother now, which is pretty impressive, since I thought they worked well before. Enabling microstepping and tweaking the configuration not only led to quieter, smoother operation, but also let it go faster without stalling or missing steps. Overall a win-win-win.