Is the Z motor getting hot to the touch after the 15 minutes run time?
Did you lower the velocity and accel in the program or did you just lower them in config.
What i was wanting was for the program to be run at say 50 of current values and that includes any rapid moves at a lower velocity.
So you need to do both.
I am assuming that everthing is tight, like the couplings or pulleys. If you run very slow you should not have a problem with missing steps,
one woud think......
RICH
RICH