Thanks John,
I agree with you about the backlash.
Do you have any suggestions for testing the stepper and BOB?

The entire file that a ran was generated from a .JPG file, I have done that hundreds of times before without any issues.

Is there a Gcode oR Mcode that could change the Z position, if there is one I could scan the file and see if there were any codes like that in the file. Kinda shooting in the dark but don’t know where to go from here.

Thanks