I had already to replace my paneduet 7i as well

Yea its with the board. all axis work fine but anything plugged into the z axis is just not getting the right current which is making both motors stutter. Im going to run down to my shop and show them the problem .

I tested the with a multi meter for 1a 2a coils and 2a 2b coils are all good. I ran a print that was successful already so thats out of the question.. hmmmm.. the current is at 800MA

So its got to be the board . I ran two seperate motors from the same ports on z axis and they did the same thing. Stutter. I changed the wires and still stutter..

yea when i move it myself it runs ok.. like up and down but when its plugged in it shakes when it starts.

the stepper is moving like butter both of them when i move them myself.

imma unplug everything and just test the z axis motors see if it was another wire causing the issue.

Im running the Cr10s dual lead screw. I ran a successful print and went to start another and when I home z will shake really bad. So I tested other wires out same thing. I tested two other motors and the motors are stuttering too.. The lead screws have no tension or nothing on them.

So I tested two other motors and the same Stuttering.. Is my z axis fried? .. All the other axis work .

k thanks guys!