Actually one last question now I know you about your machine - if you have the original Z stepper, (mine's original, HY200 3424 0310) how many amps are you running it at? I know they are rated for 3.1A but whoever converted my novamill to mach3 set the driver at around 1.5A, even though s/he had 2.5A available, and I'm wondering if there's a good reason for that.