Multiple independent Z motor Z sync issue

RandyL

I'm trying to convert my Duet Wifi to use independent Z drivers so I can auto level the gantry. I followed the instructions here: https://duet3d.dozuki.com/Wiki/Bed_levelling_using_multiple_independent_Z_motors#Section_Example_for_2_motors

When I boot up the board and try to move the Z axis, the side connected to the Z stepper moves faster (farther) than the motor connected to the E1 extruder stepper. I verified this by flipping the motor connections. If I flip the connections the issues moves to the other side so I know it's the board. If I go back to connecting the two motors in series they move in parallel.

I'm running firmware version:2.02(RTOS) (2018-12-24b1). My config looks like so:

; General preferences
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves

; Gantry Leveling
M584 X0 Y1 Z2:4 ; two Z motors connected to driver outputs Z and E1
M671 X-20:335 Y0:0 S0.5 ; leadscrews at left and right of X axis
M208 X0:315 Y0:315 z0:400 ; X carriage moves from -5 to 205, Y bed goes from 0 to 200
Drives
M569 P0 S0 ; Drive 0 goes backwards
M569 P1 S0 ; Drive 1 goes backwards
M569 P2 S1 ; Drive 2 goes forwards
M569 P3 S1 ; Drive 3 goes forwards
M569 P4 S1 ; Drive 3 goes forwards

M350 X16 Y16 Z16 I1 ; Configure microstepping with interpolation
M350 E32 I1 ; Configure microstepping with interpolation

M92 X80.00 Y80.00 Z408.00 E835.50 ; Set steps per mm - was 400, E837

M566 X600.00 Y600.00 Z24.00 E300.00 ; Set maximum instantaneous speed changes (mm/min)
M203 X12000.00 Y12000.00 Z600.00 E1500.00 ; Set maximum speeds (mm/min)

M201 X500.00 Y500.00 Z100.00 E5000.00 ; Set accelerations (mm/s^2)
M906 X800.00 Y800.00 Z800.00 E800.00 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

Any advice will be most welcome!

Veti

@randyl said in Multiple independent Z motor Z sync issue:

M584 X0 Y1 Z2:4

look at the docu. you have to assign all drivers. you are missing the E assignment.

RandyL

Veti,

Added E0, did the trick...

Many Thanks!

dc42

@randyl said in Multiple independent Z motor Z sync issue:

Veti,

Added E0, did the trick...

Many Thanks!

I presume you mean you added E3 to the M584 command.