@veti
Thanks, that's the trouble with only being able to spend 20-30 min in the middle of the night trying to troubleshoot. Simple stuff slips by

Hello all, I appreciate any help with this. Tried to add to another thread about this but it was locked.

Using just one Z output/jumpers the stepper works just fine, but using dual Z the movement is stuttered, loud and slow. Either Z stepper plugged into E,X,Y work correctly as well.

Tried using the suggestion in the other thread of using E1 for the second Z stepper using below code "before any M350 / M906 commands". M584 X0 G1 S2:4 E3
No motor movement after adding to config.g

I've tried both with/without a M569 P4 S0 command

Firmware Name: RepRapFirmware for Duet 2 WiFi/Ethernet
Firmware Electronics: Duet WiFi 1.02 or later
Firmware Version: 2.02(RTOS) (2018-12-24b1)
WiFi Server Version: 1.22
Web Interface Version: 1.22.6

; Drives
M569 P0 S0 ; Drive 0 goes backwards
M569 P1 S0 ; Drive 1 goes backwards
M569 P2 S0 ; Drive 2 goes backwards
M569 P3 S0 ; Drive 3 goes backwards
M584 X0 G1 S2:4 E3
M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
M92 X79.70 Y80.30 Z1600.00 E456.00 ; Set steps per mm
M566 X600.00 Y600.00 Z18.00 E300.00 ; Set maximum instantaneous speed changes (mm/min)
M203 X18000.00 Y18000.00 Z300.00 E1500.00 ; Set maximum speeds (mm/min)
M201 X3000.00 Y3000.00 Z100.00 E300.00 ; Set accelerations (mm/s^2)
M906 X800.00 Y800.00 Z600.00 E600.00 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout