@infiniteloop Thank you very much, then ... I checked and checked the wiring several times. The endstops of Z, unlike those for X and Y, are optical and when I enter Machine Properties they respond perfectly in the right way. The homing of XYZ does it perfectly. I connected the second Z (U) axis to Drive 3 and the extruder to Drive 4. The wiring is in place also because when I start a print the machine starts without problems. The problem is that during printing only one motor of the Z axis moves and for me this is incomprehensible since the movements and the homing Z, not in print, are executed correctly.

@Phaedrux said in Chiron Dual Z Help me please:

Are you recombining the split Z axis into one after leveling them?
https://duet3d.dozuki.com/Wiki/Bed_levelling_using_multiple_independent_Z_motors

Thank you, does this procedure also apply to manual leveling? That is, with the classic sheet of paper and moving the bed by hand?

Hello everyone, I'm new to the forum. I have a problem with Anycubic Chiron and Duet 2 Wifi. Anycubic has two optical endstops for the Z axis and I do not use the leveling probe. I perform manual leveling.
I think I've set everything up in the best way but I can't print. I connected the first motor to Driver 2 with the respective jumpers. The other Z engine connected it to E0 - Driver 3. One endstop to Z Stop and the other to E0 Stop. I created second Z axis (U) with M584 X0 Y1 Z2: 3 U3 E4. Everything seems to go beautifully. Home XYZ all right. The two Z axes (Z and U) go home without problems. Raising and lowering Z the two engines work well in sync. Now, however, when I cast a print, only one motor moves in Z + while the other remains completely stopped. Someone could help me solve this problem. Thanks in advance to everyone.

This is my Config.g

; Configuration file for Duet WiFi (firmware version 1.21)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool on Wed Nov 07 2018 17:54:35 GMT+0100 (centraleuropeisk normaltid)

; General preferences
G21
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves

; Network
M550 PChiron ; Set machine name
M552 S1 ; Enable network
M587 S"NETGEAR73" P"elegantsquash782" ; Configure access point. You can delete this line once connected
M586 P0 S1 ; Enable HTTP
M586 P1 S0 ; Disable FTP
M586 P2 S0 ; Disable Telnet

; Drives
M569 P0 S0 ; Drive 0 X goes backwards
M569 P1 S0 ; Drive 1 Y goes forwards
M569 P2 S0 ; 1st-zmotor (original Z) goes forwards
M569 P3 S0 ; 2nd-zmotor - Normally used as Extruder 1
M569 P4 S1 ; Extruder 0 goes forwards

;Remapping drivers for axis Z 2-3 drivers

M584 X0 Y1 Z2:3 U3 E4 ; Driver 0 For X, 1 for Y, Z=2:4 U=4, Extruder 3 P3 not show U axis in GUI

; Movement setting
M350 X16 Y16 Z16:16 E16 U16 I1 ; Configure microstepping with interpolation
M92 X80 Y100 Z400.00:400.00 U400 E429.31 ; Set steps per mm
M566 X900 Y900 Z300.00:300.00 E100.00 U300.00 ; Set maximum instantaneous speed changes (mm/min) (Jerk)
M203 X12000 Y12000 Z300.00:300.00 E1200 U300.00 ; Set maximum speeds (mm/min) UU
M201 X2000 Y2000 Z50.00:50.00 E5000.00 U50.00 ; Set accelerations (mm/s^2)
M906 X1200.00 Y1200.00 Z1200.00:1200.00 E960 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Axis Limits
M208 X0 Y0 Z0 S1 ; Set axis minima
M208 X400 Y400 Z450 S0 ; Set axis maxima

; Endstop
M574 X1 Y1 S0 ; Set Endstop and S signal
M574 Z1 U1 S1

; Heaters
M305 P0 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 0 Bed
M143 H0 S120 ; Set temperature limit for heater 0 to 120C
M305 P2 T100000 B4725 C0.0000000706 R4700 ;T100000 B4138 C0 R47OO
M143 H2 S285 ; Set temperature limit for heater 1 to 280C

; Fans
M106 P0 S0
M106 P1 S255 T45 H2

; Tools
M563 P0 D0 H2 ; Define tool 0
G10 P0 X0 Y0 Z0 ; Set tool 0 axis offsets
G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C

; Automatic power saving
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; Set voltage thresholds and actions to run on power loss

; Custom settings are not configured

T0