@alankilian I might have found the problem.
I checked the resistances of the 5V signal wires
from the breakout board to the stepper drivers again and I found one cable that has infinite resistance.
It seems like it is one of the dir+- cables. So that would explain why the motor is running but cannot change its director.

At first I was expecting it to be the crimps or the connectors, but it appears that even with new crimps the cable is corrupted.

I'm checking in again in the evening and take a new cable, measure the resistances and hope that this solves to problem.

@Phaedrux thanks for the help, I added the home sequence and its working fine now Also I had the drives in the wrong order so the compensation was wrong at first, too.

@Phaedrux thanks for the help, I added the home sequence and its working fine now Also I had the drives in the wrong order so the compensation was wrong at first, too.

Hey guys,

I recently swapped out my dual endstops on my bed for a BL Touch - goal is to achieve ABL and getting a mesh grid of my bed.

Homing XY is working just fine, but Z Axis (I am using dual leadscrews in the middle of the bed, left&right) is making trouble. After having finished the XY home sequence, the gantry is moving to the first probing point just fine and homing with BL Touch.
It´s then moving up the bed to home the 2nd point., where after the bed descends a whole lot and homing fails.

2 problems:

1. The bed is descending around 75-85 mm after the first probe point (I would like to reduce that, but I can´t seem to find how)
2. Homing fails: Error: Some corrupted corrections exceed configured limit of 1.0mm: -75.040 -75.380

I have a feeling that, genereally that this is only a minor problem, as the limits are only 0.3 mm apart, so I´m hoping for an easy fix.

This is the bed.g:

; bed.g
; called to perform automatic bed compensation via G32
;
; generated by RepRapFirmware Configuration Tool v3.2.3 on Sun Apr 04 2021 15:17:44 GMT+0200 (Mitteleuropäische Sommerzeit)
;G29  ; probe the bed and enable compensation

G28 ; home

M561 ; clear any bed transform

;M671 P5.0 X365.0:365.0 Y3-32:762 ; Z pivot points are at (340:-32) (340:712) 712 = 680+32

G30 P0 X365.0 Y100 Z-9999 ;PROBE NEAR A Front LEADSCREW
;G1 F60000 X20 Y235 Z10
G30 P1 X365.0 Y630 Z-9999 S2 ;PROBE NEAR A Back LEADSCREW

config.g :

M569 P0 S1 ; Drive 0 X 
M569 P1 S1 ; Drive 1 Y
;M569 P2 S0 ; Left z-motor (original Z) 												; NOT USED
M569 P3 S1 ; Drive3 [Extruder 0] - new Extruder 0 [ENABLED]
M569 P4 S1 ; Drive4 [Extruder 1] - new Extruder 1 [ENABLED]

M569 P5 R1 T2.5:2.5:5:5 S0 ; BreakoutBoard_Driver5 - new Z Axis || Von Steuerkiste hinten 
M569 P6 R1 T2.5:2.5:5:5 S0 ; BreakoutBoard_Driver7 - new Z Axis || Von Steuerkiste vorne 

; M569 P7 S1 ; Extruder2 - Physical Tool 2
; M569 P8 S1 ; Extruder3 - Physical Tool 3
; M569 P9 S1 ; Extruder4 - Physical Tool 4  

M584 E3 E4										; set drive mapping Driver  Extruder 3, Extruder 4
M584 X0 Y1 Z5:6 P3   							; set drive mapping Driver 0 For X, 1 for Y,  Z 5:7, with 4 Axis (exkl. Extruders) visible in UI
;M671 P5.0 X0:700 Y0:700 S2.5 					; leadscrews at left (connected to Z) and right (connected to E1) of X axis
M671 P5.0 X365.0:365.0 Y-32:762 S1; Z pivot points 

; Z-Probe
M574 Z2 S2 P"bltouch" 							; Z min active high endstop z-probe
M950 S0 C"!exp.heater7"                         ; create servo pin 0 for BLTouch on Duet 2 Wifi + Expansion Board
M558 P9 C"^zprobe.in" H5 F120 T6000             ; set Z probe type to bltouch and the dive height + speeds
G31  P500 X43 Y-47.8 Z3.36                             ; set Z probe trigger value, offset and trigger height
;M557 X20:710 Y20:710 S20                       ; define mesh grid

homez.g:

G91 ; relative position
G1 Z9 F6000 S2 ; lower z by 9
G90 ; absolute position

G30 P0 X365 Y100 Z-9999 ; probe point 0 near a leadscrew
G30 P1 X365 Y630 Z-9999 S2; probe point 1 near a leadscrew
;G1 Z-15 F5000 ; raise z to 15



G90               ; absolute positioning

Thanks for your help. I genereally understand the problem of the 2 axis not being able to compensate for 75 mm each, but in this case it doesn´t make any sense to me, as the bed is pretty level already.

@knuxvomica no they don´t.
Current state: G28 homing failed , and nothing happens
Before with a homez.g: The axis lifts 5mm, moves down then passes! the endstops and hits my frame when I don´t emergency stop...

As you can see I am using the M564 command to test the axis movements in advance (which works fine) but obviously I don´t have any homing , i.e. no printing possible

M564 H0 ;move without homing

Here is the full config.g:

; Configuration file for Duet WiFi (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.2.3 on Sun Apr 04 2021 15:17:44 GMT+0200 (Mitteleuropäische Sommerzeit)
;References
; ------------->  https://docs.duet3d.com/en/User_manual/Reference/Gcodes  <-------------

M911 S21.0 R23.0 P"M913 X0 Y0 G91 M83 G1 Z5:6 E-3:4 F1000" ; Power Loss ||  Drives noch Anpassen ; sys/ressurect-prologue.g noch anlegen

; General preferences
G90                                             ; send absolute coordinates...
M83                                             ; ...but relative extruder moves
M550 P"Print Eastwood"                          ; set printer name
M669 K1                                         ; select CoreXY mode

; Network
M552 S1                                         ; enable network
M586 P0 S1                                      ; enable HTTP
M586 P1 S0                                      ; disable FTP
M586 P2 S0                                      ; disable Telnet


M564 H0 ;move without homing
; Define Drives

M569 P0 S1 ; Drive 0 X 
M569 P1 S1 ; Drive 1 Y
;M569 P2 S0 ; Left z-motor (original Z) 												; NOT USED
M569 P3 S1 ; Drive3 [Extruder 0] - new Extruder 0 [ENABLED]
M569 P4 S1 ; Drive4 [Extruder 1] - new Extruder 1 [ENABLED]

M569 P5 R1 T2.5:2.5:5:5 S1 ; BreakoutBoard_Driver5 - new Z Axis Left 
M569 P7 R1 T2.5:2.5:5:5 S1 ; BreakoutBoard_Driver7 - new Z Axis Right


M584 E3 E4										; set drive mapping Driver  Extruder 3, Extruder 4
M584 X0 Y1 Z5:7 P3   							; set drive mapping Driver 0 For X, 1 for Y,  Z 5:7, with 4 Axis (exkl. Extruders) visible in UI
M671 X-20:820 Y400:400 S2.5 						; leadscrews at left (connected to Z) and right (connected to E1) of X axis
													
M350 X16 Y16 Z16:16 E16:16 I1				    			; configure microstepping with interpolation - enable microstepping						ich weiß gar nicht ob mehr als 16 überhaupt geht....
M92 X640 Y640 Z3200:3200 E3360:3440             			; set steps per mm 
M566 X500 Y500 Z20:20  E1500:1500   						; set maximum instantaneous speed changes (mm/min) [Jerk]
M203 X30000 Y30000 Z420:420 E12000:12000		   			; Set maximum speeds (mm/min)
M201 X2500 Y2500 Z300:300 E2000:2000    	   				; Set accelerations (mm/s^2)
M906 X2000 Y2000 E500:500 I30                   			; set motor currents (mA) and motor idle factor in per cent
M84 S60                                        			    ; Set idle timeout

; Axis Limits
M208 X0 Y0 Z0 S1                                ; set axis minima
M208 X780 Y780 Z650 S0                          ; set axis maxima

; Endstops
M574 X1 S1 P"xstop"                             ; configure active-high endstop for low end on X via pin xstop
M574 Y1 S1 P"ystop"                             ; configure active-high endstop for low end on Y via pin ystop
M574 Z1 S1 P"e1stop+e0stop" 					; configure active-low endstops for low end on Z via pins e1stop and e0stop


;M574 Z1 U1 S0 									; Set active low endstops DUAL Z
;M558 P0 X0 Y0 Z0 H2 F60 T6000 					; Set Z probe type to switch, the axes for which it is used and the dive height + speeds || P0 = keine Z-Probe verbaut
;G31 P600 X0 Y0 Z0 								; Set Z probe trigger value, offset and trigger height
;M557 X15:195 Y15:195 S20 						; Define mesh grid

; Temp Sensors
M308 S0 P"spi.cs1" Y"rtd-max31865" ; create sensor number 0 as a PT100 sensor in the first position on the Duet 2 daughter board connector // BLAU GRAU // sets extruder 1 sensor type
M308 S1 P"spi.cs2" Y"rtd-max31865" ; create sensor number 1 as a PT100 sensor in the second position on the Duet 2 daughter board connector // SCHWARZ ROSA // sets extruder 2 sensor type

M308 S2 P"bed_temp" Y"thermistor" T100000 B4349   ;sets bed sensor type // UNUSED


; Heaters
; Main Nozzle
M950 H0 T0 C"e0heat"	; make extruder #0 heater
M950 H0 C"e0heat" T0    ; create nozzle heater output on e0heat and map it to sensor 0
M307 H0 B0 S1.00        ; disable bang-bang mode for heater  and set PWM limit
M143 H0 S350  			; set temperature limit for heater 0 to 350C

; Secondary Nozzle
M950 H1 T1 C"e1heat"	;make extruder #1 heater
M950 H1 C"e1heat" T1    ; create nozzle heater output on e1heat and map it to sensor 1
M307 H1 B0 S1.00        ; disable bang-bang mode for heater  and set PWM limit
M143 H1 S350            ; set temperature limit for heater 1 to 350C

; M950 H2 T2 C"bedheat"   ;make bed heater
; M307 H2 B2 S1.00        ;enable bang-bang mode for the bed heater and set PWM limit
; M143 H2 S100            ;set temperature limit for heater 0 to 120C
; M140 H2 

; AirPump
M950 F0 C"bedheat" Q500			; create fan 5 on pin bedheat and set its frequency (500Hz)
M106 P0 S0 H-1					; set fan 0 value. Thermostatic control is turned off  // BerdAir Q PWM 500Hz // Fan for Printing 

; Hotend Fans
M950 F1 C"fan0" Q500                            ; create fan 1 on pin fan0 and set its frequency
M106 P1 S255 H0 T45                               ; set fan 1 value. Thermostatic control is turned on // Fan for Hotend 0
 
M950 F2 C"fan1" Q500                            ; create fan 2 on pin fan1 and set its frequency
M106 P2 S255 H1 T45                               ; set fan 2 value. Thermostatic control is turned on // Fan for Hotend 1

; Fans
M950 F3 C"fan3" Q500                            ; create fan 3 on pin fan3 and set its frequency
M106 P3 S0 H-1                                  ; set fan 3 value. Thermostatic control is turned off

M950 F4 C"fan4" Q500                            ; create fan 4 on pin fan4 and set its frequency
M106 P4 S0 H-1                             		; set fan 4 value. Thermostatic control is turned on

;M950 F0 C"fan0" Q500                            ; create fan 0 on pin fan0 and set its frequency
;M106 P0 S0 H-1                                  ​; set fan 0 value. Thermostatic control is turned off


; Tools
M563 P0 D0 H0 S"Main" F1                        ; define tool 0 // Hotend 0 // Fan1
G10 P0 X0 Y0 Z0                                 ; set tool 0 axis offsets
G10 P0 R0 S0                                    ; set initial tool 0 active and standby temperatures to 0C

M563 P1 D1 H1 S"Secondary" F2					; define tool 1 // Hotend 1 // p toolnr // d drivenr // h heaternr // f fannr // Fan2
G10 P1 X0 Y0 Z0                                 ; set tool 1 axis offsets , noch setzen
G10 P1 R0 S0                                    ; set initial tool 1 active and standby temperatures to 0C 

; Custom settings are not defined

; Miscellaneous
M575 P1 S1 B57600                               ; enable support for PanelDue

; MCU Anpassung
M912 P0 S82,5

Hi guys, I was trying to follow the documentation on the dual independent z-axis for my printer.
My problem is, that it is not mentioned how the homez.g should look like:
this is where you can find the documentation

I am using RRF3.x Firmware and I cannot home my z-axis at the moment.
This is what I am currently using in my config.g:

M569 P5 R1 T2.5:2.5:5:5 S1 ; BreakoutBoard_Driver5 - new Z Axis Left 
M569 P7 R1 T2.5:2.5:5:5 S1 ; BreakoutBoard_Driver7 - new Z Axis Right
M584 X0 Y1 Z5:7 P3   		 ; set drive mapping Driver 0 For X, 1 for Y,  Z 5:7
M671 X-20:820 Y400:400 S2.5 						; leadscrews at left (connected to Z) and right 
(connected to E1) of X axis

M574 Z1 S1 P"e1stop+e0stop" 					; configure active-low endstops for low end on Z via pins e1stop and e0stop

I am using the Duet Breakout Board and have my 2 external stepper drivers connected to the pins 5 and 7 - the corresponding endstops are wired to "e1stop&e0stop". The wiring is correct, the motors are moving and the LED is flashing, when the endstops are pressed.

This is the bed.g:

G28 ; home
M401 								; deploy Z probe (omit if using bltouch)
G30 P0 X20 Y400 Z-99999 			; probe near a leadscrew, half way along Y axis || P = Probe Number
G30 P1 X780 Y400 Z-99999 S2 		; probe near a leadscrew and calibrate 2 motors
M402 								; retract probe (omit if using bltouch)

I have no clue what my homez.g should look like rn. I have had several errors and completely leaving it out won´t work either ^^ .

homeall.g:

G91                     		; relative positioning

G1 H1 X-805 Y-805 F3000  		; move quickly to X or Y endstop and stop there (first pass) coarse home X or Y
G1 H1 X-805             		; home X axis coarse
G1 H1 Y-805             		; home Y axis coarse
G1 X5 Y5 F500          			; go back a few mm
G1 H1 X-10         				; move slowly to X axis endstop once more (second pass)
G1 H1 Y.10              		; then move slowly to Y axis endstop
G90                     		; absolute positioning X/Y

homez.g: [probably the main issue, also the fact, that there are like 300 different possibilities for z probing is super confusing - at least for me]

;G91 ; relative positioning
;G1 H2 Z5 F6000 ; lift Z relative to current position
;G90 ; absolute positioning
;G1 X5 Y85 F6000 ; go to first probe point
;G30 ; home Z by probing the bed

Thanks a lot in advance. I wouln´t write this if I hadn´t tried fixing it by myself for the last 5 hours...
I might be using a BL Touch in the future but this is a different story.

@alankilian I might have found the problem.
I checked the resistances of the 5V signal wires
from the breakout board to the stepper drivers again and I found one cable that has infinite resistance.
It seems like it is one of the dir+- cables. So that would explain why the motor is running but cannot change its director.

At first I was expecting it to be the crimps or the connectors, but it appears that even with new crimps the cable is corrupted.

I'm checking in again in the evening and take a new cable, measure the resistances and hope that this solves to problem.

Hey folks, I am having a super weird problem with my setup rn.

I am using a Duet 2 Wifi Board with Expansion Breakout Board. My 2 Z-Axis motors (Nema 23 4.2A) are connected to a external driver (DM542T) with an external PSU. The 4 signal connectors come from the Breakout board (and the ENABLE is not connected).

As soon as I start the motion via the UI, the weirdness happens:
If I press up : both z-motors turn forward and up
If I press down: one motor turns backwards (as expected) - the other one turns in the opposite direction.

I have tried the different motors on the different driver; they are wired correctly. I have tried exchanging the signal cables + reasigning different ports , and nothing changed.
Settings on the external drivers (i.e. microstepping, currents are identical)

First thought: Driver must be having a problem , exchanged it - same problem again.
What could be the problem here?
I can only see some potential errors in the software but I am not aware of anything like this even being possible.
The 2 Z drives are currently connected to the drivers 5 & 7 on the Breakout Board.

Config.g:

M569 P0 S1 ; Drive 0 X 
M569 P1 S1 ; Drive 1 Y
M569 P2 S0 ; Left z-motor (original Z) 												; NOT USED
M569 P3 S1 ; Drive3 [Extruder 0] - new Extruder 0 [ENABLED]
M569 P4 S1 ; Drive4 [Extruder 1] - new Extruder 1 [ENABLED]

M569 P5 R1 T2.5:2.5:5:5 S1 ; BreakoutBoard_Driver5 - new Z Axis Left 
M569 P7 R1 T2.5:2.5:5:5 S1 ; BreakoutBoard_Driver7 - new Z Axis Right

; M569 P7 S1 ; Extruder2 - Physical Tool 2
; M569 P8 S1 ; Extruder3 - Physical Tool 3
; M569 P9 S1 ; Extruder4 - Physical Tool 4  

M584 E3 E4					; set drive mapping Driver  Extruder 3, Extruder 4
M584 X0 Y1 Z5:7 P4   		; set drive mapping Driver 0 For X, 1 for Y,  Z 5:7, with 4 Axis (exkl. Extruders) visible in UI
													
M350 X16 Y16 Z16:16 E16:16 I1				    			; configure microstepping with interpolation - enable microstepping						ich weiß gar nicht ob mehr als 16 überhaupt geht....
M92 X640.00 Y640.00 Z3200:3200 E3360:3440             		; set steps per mm 
M566 X500.00 Y500.00 Z20.00:20.00 E1500:1500   				; set maximum instantaneous speed changes (mm/min) [Jerk]
M203 X18000 Y18000 Z420::420 E12000:12000		   			; Set maximum speeds (mm/min)
M201 X1200 Y1200 Z100:100 E2000:2000    	   				; Set accelerations (mm/s^2)
M906 X2000 Y2000 E500:500 I30                   			; set motor currents (mA) and motor idle factor in per cent
M84 S60                                        			    ; Set idle timeout

I appreciate your help! Also I don´t really know a fitting Category for this...

@engikeneer as I said, I calibrated it this morning. The Temp showed neg. 59 Deg. so I had to change the value by 80,5 but thats too much I assume!

@luke-slaboratory yes the whole electronics are placed in a box. But it has the PCU fan AND 2 80mm EWM Pabst fans that are permanently running.

@bot ah , so the ATMEL ARM XYZ Chip. Thx! So thats truely a calibration problem. The measured temp is 27 C. I was wondering alreadz as there is neither a print nor eny steppers running.