Posts made by Timothee Leblond

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@fcwilt

Hi Frederick,

I like your approach. Could you please show a test file?

Thank you,

TIM

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@gloomyandy

UPDATE:

I tried tweaking the var commands it seems that the following are much better:

var xCenter = (move.axes[0].min + move.axes[0].max) / 2 - sensors.probes[0].offsets[0]
var yCenter = (move.axes[1].min + move.axes[1].max) / 2 - sensors.probes[0].offsets[1]

At least, X and Y are now moving to a point on the bed. It is not the center but maybe it comes from the offset settings.. Do you know how to deal with this? Would you also have an idea why I cannot raise Z much?

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@gloomyandy

Here is the answer from echo: X center -0.5 y center -0.5
I forgot to mention that my homez had been done through the RRF config tool.

And here is the video:
IMG_5972.mp4

What you see in the video:
-Homing X and Y work
-Homing Z is sending the bed in the wrong direction and probing is not at bed center.

I also have another problem that is not visible on the video. I can't raise the Z axis more than 10 cm above the bed. The motors jam and make a lot of noise.

Hopefully you'll see what I mean. Let me know if you need further details.

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@gloomyandy

Thanks for your help!
Following your advice, I'm now calling my home macros in my homeall.g.
However, after changing homez according to your suggestion, I still have problems. In the following file, the printer is sending the bed on the low end (towards me) although is should go in the high end. Then, it is probing without moving to the center (X not moving). What is weird is that home XY both work as expected.

; homez.g
; increase Z

G91                                    ; relative positioning
G1 H2 Z5                               ; move Z relative to current position to avoid dragging nozzle over the bed
G90                                    ; absolute positioning

; home Z
; NOTE: The following XY position is determined from the probe grid defined in the next section
var xCenter = move.compensation.probeGrid.mins[0] + (move.compensation.probeGrid.maxs[0] - move.compensation.probeGrid.mins[0]) / 2 - sensors.probes[0].offsets[0]
var yCenter = move.compensation.probeGrid.mins[1] + (move.compensation.probeGrid.maxs[1] - move.compensation.probeGrid.mins[1]) / 2 - sensors.probes[0].offsets[1]
G1 X{var.xCenter} Y{var.yCenter} F6000 ; go to bed centre
M401
G30                                    ; probe the bed
M402 ; retract probe

In my config.g, I have the following. M574 Y2 S3 should indicate to home in the high end.

; Endstops
M574 X1 S3                            ; configure X axis endstop
M574 Y2 S3                            ; configure Y axis endstop
M574 Z1 S2                            ; configure Z axis endstop
M915 X Y R0 F0

Home X and home Z work now:

; homex.g
; called to home the X axis
;
; generated by RepRapFirmware Configuration Tool v3.5.8 on Tue Dec 10 2024 15:03:23 GMT-0500 (Eastern Standard Time)

; increase Z
G91 ; relative positioning
G1 H2 Z5 ; move Z relative to current position to avoid dragging nozzle over the bed
G90 ; absolute positioning
M400
M913 X70 Y70 ; drop motor current to 40% -> for sensorless homing
M400

; home X
G91 ; relative positioning
var maxTravel = move.axes[0].max - move.axes[0].min + 5 ; calculate how far X can travel plus 5mm
G1 H1 X{-var.maxTravel} F3000                            ; coarse home in the -X direction
G1 X5 F3000                                             ; move back 5mm
G1 H1 X{-var.maxTravel} F1000                            ; fine home in the -X direction
G90 ; absolute positioning

; decrease Z again
G91 ; relative positioning
G1 H2 Z-5 F6000 ; move Z relative to current position
G90 ; absolute positioning

M400 ; Wait for current moves to finish
M913 X100 Y100 ; return current to 100% -> for sensorless homing
M400 ; Wait for current moves to finish

; homey.g
; called to home the Y axis
;
; generated by RepRapFirmware Configuration Tool v3.5.8 on Tue Dec 10 2024 15:03:23 GMT-0500 (Eastern Standard Time)

; increase Z
G91 ; relative positioning
G1 H2 Z5 ; move Z relative to current position to avoid dragging nozzle over the bed
G90 ; absolute positioning

M400 ; Wait for current moves to finish
M913 X70 Y70 ; drop motor current to 70% -> for sensorless homing
M400

; home Y
G91                                                     ; relative positioning
var maxTravel = move.axes[1].max - move.axes[1].min + 5 ; calculate how far Y can travel plus 5mm
G1 H1 Y{var.maxTravel} F3000                             ; coarse home in the +Y direction
G1 Y-5 F3000                                            ; move back 5mm
G1 H1 Y{var.maxTravel} F2000                             ; fine home in the +Y direction
G90                                                     ; absolute positioning

; decrease Z again
G91 ; relative positioning
G1 H2 Z-5 F6000 ; move Z relative to current position
G90 ; absolute positioning

M400 ; Wait for current moves to finish
M913 X100 Y100 ; return current to 100% -> for sensorless homing
M400 ; Wait for current moves to finish

Would you have an idea?

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@jay_s_uk

Okay, now I get it.

Now it's moving but I cannot figure out why it's not moving to the center.
Even replacing the following variables by simple G1 X150 Y150 do not work:

var xCenter = move.compensation.probeGrid.mins[0] + (move.compensation.probeGrid.maxs[0] - move.compensation.probeGrid.mins[0]) / 2 - sensors.probes[0].offsets[0]
;var yCenter = move.compensation.probeGrid.mins[1] + (move.compensation.probeGrid.maxs[1] - move.compensation.probeGrid.mins[1]) / 2 - sensors.probes[0].offsets[1]

I mean, it randomly works, sometimes yes, sometimes not...

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@jay_s_uk

Indeed, but I cannot home Z. I always have the Error: Insufficient axes homed for bed probing.

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@dc42

I've been following your steps:

manually placed the probe at the center
Used G92 X0 Y0 as Z homing does not work after I individually homed XY.
If I try homing Z without G92, it says: "Error: G30: Insufficient axes homed for bed probing."
Using M401 works well deploying the probe
Manually pushing the probe after G30 works well.

However here are my problems now:
-Z homing doesn't not work alone as It always sends the error mentioned.
-Sending move commands to Z always gives the same error.
-When homed, sending move commands to Y does not work well (bumping against wall with positive integers, and only accepts -10 maximum with negative ones.
-After homing all, sending move commands to Z works but stops after a bit making a noise
-Homing all works but makes a lot more noise than homing X and Y individually.
-When homing all axes, the extruder is NOT going to the center of the bed before probing...

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@fcwilt

This is smart, thank you though!

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@fcwilt
Thanks for the tip, I'll do that in the future.

But I'm not sure it will solve my problem right?

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@Phaedrux

Sure:

homeall:

; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool v3.5.8 on Tue Dec 10 2024 15:03:23 GMT-0500 (Eastern Standard Time)

; increase Z
G91 ; relative positioning
G1 H2 Z5 F6000 ; move Z relative to current position to avoid dragging nozzle over the bed
G90 ; absolute positioning

; home XY

M400
M913
M400
var xTravel = move.axes[0].max - move.axes[0].min + 5 ; calculate how far X can travel plus 5mm
var yTravel = move.axes[1].max - move.axes[1].min + 5 ; calculate how far Y can travel plus 5mm
G91 ; relative positioning
G1 H1 X{-var.xTravel} Y{var.yTravel} F4000 ; coarse home in the -X and -Y directions
G1 H2 X5 Y5 F4000 ; move back 5mm
G1 H1 X{-var.xTravel} Y{var.yTravel} F1000 ; fine home in the -X and -Y directions
G90 ; absolute positioning
M400
M913
M400

; home Z

var xCenter = move.compensation.probeGrid.mins[0] + (move.compensation.probeGrid.maxs[0] - move.compensation.probeGrid.mins[0]) / 2 - sensors.probes[0].offsets[0]
var yCenter = move.compensation.probeGrid.mins[1] + (move.compensation.probeGrid.maxs[1] - move.compensation.probeGrid.mins[1]) / 2 - sensors.probes[0].offsets[1]
G91 ; relative positioning
G1 X{var.xCenter} Y{var.yCenter} F1000 ; go to bed centre
G90 ; absolute positioning
M401
G30 ; probe the bed
M402

homex:

; homex.g
; called to home the X axis
;
; generated by RepRapFirmware Configuration Tool v3.5.8 on Tue Dec 10 2024 15:03:23 GMT-0500 (Eastern Standard Time)

; increase Z
G91 ; relative positioning
G1 H2 Z5 ; move Z relative to current position to avoid dragging nozzle over the bed
G90 ; absolute positioning
M400
M913 X40 Y40 ; drop motor current to 40% -> for sensorless homing
M400

; home X
G91 ; relative positioning
var maxTravel = move.axes[0].max - move.axes[0].min + 5 ; calculate how far X can travel plus 5mm
G1 H1 X{-var.maxTravel} F3000                            ; coarse home in the -X direction
G1 X5 F3000                                             ; move back 5mm
G1 H1 X{-var.maxTravel} F1000                            ; fine home in the -X direction
G90 ; absolute positioning

; decrease Z again
G91 ; relative positioning
G1 H2 Z-5 F6000 ; move Z relative to current position
G90 ; absolute positioning

M400 ; Wait for current moves to finish
M913 X100 Y100 ; return current to 100% -> for sensorless homing
M400 ; Wait for current moves to finish

homey:

; homey.g
; called to home the Y axis
;
; generated by RepRapFirmware Configuration Tool v3.5.8 on Tue Dec 10 2024 15:03:23 GMT-0500 (Eastern Standard Time)

; increase Z
G91 ; relative positioning
G1 H2 Z5 ; move Z relative to current position to avoid dragging nozzle over the bed
G90 ; absolute positioning

M400 ; Wait for current moves to finish
M913 X40 Y40 ; drop motor current to 70% -> for sensorless homing
M400

; home Y
G91 ; relative positioning
var maxTravel = move.axes[1].max - move.axes[1].min + 5 ; calculate how far Y can travel plus 5mm
G1 H1 Y{var.maxTravel} F3000                            ; coarse home in the -Y direction
G1 Y5 F3000                                             ; move back 5mm
G1 H1 Y{var.maxTravel} F1000                            ; fine home in the -Y direction
G90 ; absolute positioning

; decrease Z again
G91 ; relative positioning
G1 H2 Z-5 F6000 ; move Z relative to current position
G90 ; absolute positioning

M400 ; Wait for current moves to finish
M913 X100 Y100 ; return current to 100% -> for sensorless homing
M400 ; Wait for current moves to finish

homez:

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool v3.5.8 on Tue Dec 10 2024 15:03:23 GMT-0500 (Eastern Standard Time)

; ################# Home Z Preparation ################

G91 															; Relative mode
G90

G1 Z10 F3000       ; Move Z up 10mm to ensure clearance
var xCenter = move.compensation.probeGrid.mins[0] + (move.compensation.probeGrid.maxs[0] - move.compensation.probeGrid.mins[0]) / 2 - sensors.probes[0].offsets[0]
var yCenter = move.compensation.probeGrid.mins[1] + (move.compensation.probeGrid.maxs[1] - move.compensation.probeGrid.mins[1]) / 2 - sensors.probes[0].offsets[1]
G1 X{var.xCenter} Y{var.yCenter} F4000 ; go to bed centre															; Back to absolute positioning
M401
G30
M402 ; retract probe

config.g:

; Default config.g template for DuetPi
; Replace this with a proper configuration file (e.g from https://configtool.reprapfirmware.org)

; Display initial welcome message
M291 P"You are operating an SBC image in standalone mode. Please see <a href=""https://www.duet3d.com/StartHere"" target=""_blank"">here</a> further information." R"Welcome to your new Duet 3!" S1 T0

; Enable PanelDue
M575 P1 B57600 S1

; Enable network
; M552 P0.0.0.0 S1

; Configuration file for RepRapFirmware on Duet 3 Mini 5+ Ethernet
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.5.8 on Fri Dec 13 2024 08:59:52 GMT-0500 (Eastern Standard Time)

; General
G90 ; absolute coordinates
M83 ; relative extruder moves
M550 P"Duet 3" ; set hostname
M915 X Y S10 R1 F1 H2  ; set sensorless homing

M302 P1   ; Allow cold extrusion

; Accessories
M575 P1 S0 B57600 ; configure PanelDue support

; Wait a moment for the CAN expansion boards to become available
G4 S2

; Smart Drivers
M569 P0.0 S1 D3 V188; driver 0.0 goes forwards (X axis) -> D3 is for stealthChop mode = enable stall detection
M569 P0.1 S1 D3 V188; driver 0.1 goes forwards (Y axis) -> D3 is for stealthChop mode = enable stall detection
M569 P0.2 S1 D2 V188; driver 0.2 goes forwards (Z axis) -> D3 is for stealthChop mode = enable stall detection
M569 P121.0 S0 D2 ; driver 20.0 goes forwards (extruder 0)

; Motor Idle Current Reduction
M906 I30 ; set motor current idle factor
M84 S30 ; set motor current idle timeout

; Axes
M584 X0.0 Y0.1 Z0.2 ; set axis mapping
M350 X16 Y16 Z16 I1 ; configure microstepping with interpolation
M906 X800 Y800 Z800 ; set axis driver currents
M92 X80 Y80 Z400 ; configure steps per mm
M208 X-6:310 Y0:310 Z-5:405 ; set minimum and maximum axis limits
M566 X900 Y900 Z12 ; set maximum instantaneous speed changes (mm/min)
M203 X6000 Y6000 Z180 ; set maximum speeds (mm/min)
M201 X500 Y500 Z20 ; set accelerations (mm/s^2)

; Extruders
M584 E121.0 ; set extruder mapping
M350 E16 I1 ; configure microstepping with interpolation
M906 E800 ; set extruder driver currents
M92 E100 ; configure steps per mm
M566 E120 ; set maximum instantaneous speed changes (mm/min)
M203 E3600 ; set maximum speeds (mm/min)
M201 E250 ; set accelerations (mm/s^2)

; Kinematics
M669 K0 ; configure Cartesian kinematics

; Probes

M950 P0 C"out6"                              ; Set servo output on Mini 5+ 
M558 P9 H30 F250:30 T8000 C"^!io6.in"            ; Set probe input to IO_6 on Mini 5+
G31 P500 X0 Y0 Z20                                  ; set Z probe trigger value, offset and trigger height

;M950 S0 C"121.io0.out"                              ; Set servo output on Rototoolboard
;M558 P9 H6 F250:30 T8000 C"^!121.io0.in"            ; Set probe input to IO_0 on Rototoolboard
;G31 P500 X0 Y0 Z0                                  ; set Z probe trigger value, offset and trigger height

; Endstops
M574 X1 S3                            ; configure X axis endstop
M574 Y1 S3                            ; configure Y axis endstop
M574 Z1 S2                            ; configure Z axis endstop
M915 X Y R0 F0

; Tools
M563 P0 S"MainExtruder" D0 ; create Tool 0 using Extruder Drive 0
G10 P0 S0 R0 ; set Tool 0 active and standby temperatures to 0
T0 ; select Tool 0 at startup

I had the error: Error: G30: Insufficient axes homed for bed probing when trying to home all axes at the same time. For some reasons after I restarted the printer, I seem I no longer have it.
However, when I home all or home Z or send G30, the extuder gets all the way down ignoring the probe, hitting the bed. When I manually activate the pin of the probe before it reaches bed, this error appears: Error: G4: Probe already triggered at start of probing move.

On top of that, it is not going to the center of the bed before probing and my X axes make a noise when homing which I can't solve.

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@Phaedrux

For X, homing is making a noise bumping the wall but it seems to work.
For Y, I have no problem homing it.

However, the home all is problematic.

Sending M92 X0 Y0 before homing Z gives the same Error answer.
I already have M401/M402 in my homing files before and after G30.

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@Phaedrux

First of all, when I send G30 it says: "Error: G30: Insufficient axes homed for bed probing".
When I try homing, I regularly have the same problem.
Right now, when I home all, the X bumps into the wall with a noise, the probe deploys, retracts then deploys and I then have that error message again without the Y being homed.

I know my first problem may be due to the stall detection and sensorless homing through M915 in config.g. I've been trying to set it up but I still have some problems.

M915 X Y S10 R1 F1 H2  ; set sensorless homing

The wiring had been thanks to an other discussion here: https://forum.duet3d.com/topic/37443/wiring-biqu-microprobe-to-duet-rototoolboard/43

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@Phaedrux

I confirm M401/M402 are working with M950 P0 C"out6". On the contrary, it is not using M950 P0 C"io6.out".

Deploy

; deployprobe0.g
; called to deploy a physical Z probe
;
; generated by RepRapFirmware Configuration Tool v3.5.8 on Tue Dec 10 2024 15:03:23 GMT-0500 (Eastern Standard Time)

M42 P0 S1  ; Deploy probe
G4 P500      ; Pause for 500ms to ensure deployment

retract

; retractprobe0.g
; called to retract a physical Z probe
;
; generated by RepRapFirmware Configuration Tool v3.5.8 on Tue Dec 10 2024 15:03:23 GMT-0500 (Eastern Standard Time)

M42 P0 S0  ; Retract probe
G4 P500      ; Pause for 500ms

I'm using a BTT not a BlTouch, and it is advised to use ^!io6. in apparently.

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@jay_s_uk

It looks like what I made initially?
I have a G1 going to center followed by a G30.

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@jay_s_uk

So should I replace every G1 by G30 in my homez?

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@fcwilt

Hi Frederick,

Yes, the M401/M402 commands are working. M42 as well.

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Hello,

I'm trying to configure my printer to use a microprobe.
Thanks to the community, the microprobe is now wired successfully and reponds to commands in the console. I also just configured X and Y axes with stall detection and sensorless homing. As it is my first trial, I need to home printer's 3 axes. However, the microprobe isn't deploying nor palping the bed. I tried homing but I had to stop before it touches the bed. So either it is not working properly or maybe it is going too low.

Would you have any leads for me?

Board: Mini 5+
Firmware: 3.5.4
Microprobe: BTT BIQU microprobe

Config.g

; Default config.g template for DuetPi
; Replace this with a proper configuration file (e.g from https://configtool.reprapfirmware.org)

; Display initial welcome message
M291 P"You are operating an SBC image in standalone mode. Please see <a href=""https://www.duet3d.com/StartHere"" target=""_blank"">here</a> further information." R"Welcome to your new Duet 3!" S1 T0

; Enable PanelDue
M575 P1 B57600 S1

; Enable network
; M552 P0.0.0.0 S1

; Configuration file for RepRapFirmware on Duet 3 Mini 5+ Ethernet
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.5.8 on Fri Dec 13 2024 08:59:52 GMT-0500 (Eastern Standard Time)

; General
G90 ; absolute coordinates
M83 ; relative extruder moves
M550 P"Duet 3" ; set hostname
M915 X Y S5 R1 F1 H2  ; set sensorless homing

M302 P1   ; Allow cold extrusion

; Accessories
M575 P1 S0 B57600 ; configure PanelDue support

; Wait a moment for the CAN expansion boards to become available
G4 S2

; Smart Drivers
M569 P0.0 S1 D3 V188; driver 0.0 goes forwards (X axis) -> D3 is for stealthChop mode = enable stall detection
M569 P0.1 S1 D3 V188; driver 0.1 goes forwards (Y axis) -> D3 is for stealthChop mode = enable stall detection
M569 P0.2 S1 D2 V188; driver 0.2 goes forwards (Z axis) -> D3 is for stealthChop mode = enable stall detection
M569 P121.0 S0 D2 ; driver 20.0 goes forwards (extruder 0)

; Motor Idle Current Reduction
M906 I30 ; set motor current idle factor
M84 S30 ; set motor current idle timeout

; Axes
M584 X0.0 Y0.1 Z0.2 ; set axis mapping
M350 X16 Y16 Z16 I1 ; configure microstepping with interpolation
M906 X800 Y800 Z800 ; set axis driver currents
M92 X80 Y80 Z400 ; configure steps per mm
M208 X-6:310 Y0:310 Z-5:405 ; set minimum and maximum axis limits
M566 X900 Y900 Z12 ; set maximum instantaneous speed changes (mm/min)
M203 X6000 Y6000 Z180 ; set maximum speeds (mm/min)
M201 X500 Y500 Z20 ; set accelerations (mm/s^2)

; Extruders
M584 E121.0 ; set extruder mapping
M350 E16 I1 ; configure microstepping with interpolation
M906 E800 ; set extruder driver currents
M92 E100 ; configure steps per mm
M566 E120 ; set maximum instantaneous speed changes (mm/min)
M203 E3600 ; set maximum speeds (mm/min)
M201 E250 ; set accelerations (mm/s^2)

; Kinematics
M669 K0 ; configure Cartesian kinematics

; Probes

M950 P0 C"out6"                              ; Set servo output on Mini 5+ 
M558 P9 H10 F250:30 T8000 C"^!io6.in"            ; Set probe input to IO_6 on Mini 5+
G31 P500 X0 Y0 Z1.5                                  ; set Z probe trigger value, offset and trigger height

;M950 S0 C"121.io0.out"                              ; Set servo output on Rototoolboard
;M558 P9 H6 F250:30 T8000 C"^!121.io0.in"            ; Set probe input to IO_0 on Rototoolboard
;G31 P500 X0 Y0 Z0                                  ; set Z probe trigger value, offset and trigger height

; Endstops
M574 X1 S3                            ; configure X axis endstop
M574 Y1 S3                            ; configure Y axis endstop
M574 Z1 S0                            ; configure Z axis endstop
M915 X Y R0 F0

; Tools
M563 P0 S"MainExtruder" D0 ; create Tool 0 using Extruder Drive 0
G10 P0 S0 R0 ; set Tool 0 active and standby temperatures to 0
T0 ; select Tool 0 at startup

Homeall.g

; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool v3.5.8 on Tue Dec 10 2024 15:03:23 GMT-0500 (Eastern Standard Time)

; increase Z
G91 ; relative positioning
G1 H2 Z5 F6000 ; move Z relative to current position to avoid dragging nozzle over the bed
G90 ; absolute positioning

; home XY

M400
M913
M400
var xTravel = move.axes[0].max - move.axes[0].min + 5 ; calculate how far X can travel plus 5mm
var yTravel = move.axes[1].max - move.axes[1].min + 5 ; calculate how far Y can travel plus 5mm
G91 ; relative positioning
G1 H1 X{-var.xTravel} Y{-var.yTravel} F4000 ; coarse home in the -X and -Y directions
G1 H2 X5 Y5 F4000 ; move back 5mm
G1 H1 X{-var.xTravel} Y{-var.yTravel} F4000 ; fine home in the -X and -Y directions
G90 ; absolute positioning
M400
M913
M400

; home Z
var xCenter = move.compensation.probeGrid.mins[0] + (move.compensation.probeGrid.maxs[0] - move.compensation.probeGrid.mins[0]) / 2 - sensors.probes[0].offsets[0]
var yCenter = move.compensation.probeGrid.mins[1] + (move.compensation.probeGrid.maxs[1] - move.compensation.probeGrid.mins[1]) / 2 - sensors.probes[0].offsets[1]
G1 X{var.xCenter} Y{var.yCenter} F4000 ; go to bed centre
G30 ; probe the bed

homez.g

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool v3.5.8 on Tue Dec 10 2024 15:03:23 GMT-0500 (Eastern Standard Time)

; ################# Home Z Preparation ################

G91 															; Relative mode
G1 H2 Z5 F5000													; Lower the bed
G90	
G1 Z10 F4000       ; Move Z up 10mm to ensure clearance
var xCenter = move.compensation.probeGrid.mins[0] + (move.compensation.probeGrid.maxs[0] - move.compensation.probeGrid.mins[0]) / 2 - sensors.probes[0].offsets[0]
var yCenter = move.compensation.probeGrid.mins[1] + (move.compensation.probeGrid.maxs[1] - move.compensation.probeGrid.mins[1]) / 2 - sensors.probes[0].offsets[1]
G1 X{var.xCenter} Y{var.yCenter} F4000 ; go to bed centre															; Back to absolute positioning

; ################# Home Z Preparation ################

G30					 											; Probe a single point

Thanks!

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@jay_s_uk

I kinda got what you meant. I tried using the following parameters and not It is not making noise anymore and works properly.

M915 X Y S5 R1 F1 H2  ; set sensorless homing

Do I need to put the same M915 at the end of my config.g after the endstop section? (instead of M915 X Y R0 F0)

Also, using a Biqu microprobe as Z sensor - Should I use the same parameters for Z axes such as D3 for stealthchop? Does my homez looks good:

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool v3.5.8 on Tue Dec 10 2024 15:03:23 GMT-0500 (Eastern Standard Time)

; ################# Home Z Preparation ################

G91 															; Relative mode
G1 H2 Z5 F5000													; Lower the bed
G90	
var xCenter = move.compensation.probeGrid.mins[0] + (move.compensation.probeGrid.maxs[0] - move.compensation.probeGrid.mins[0]) / 2 - sensors.probes[0].offsets[0]
var yCenter = move.compensation.probeGrid.mins[1] + (move.compensation.probeGrid.maxs[1] - move.compensation.probeGrid.mins[1]) / 2 - sensors.probes[0].offsets[1]
G1 X{var.xCenter} Y{var.yCenter} F4000 ; go to bed centre															; Back to absolute positioning

; ################# Home Z Preparation ################

G30					 											; Probe a single point

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@jay_s_uk

Even with stealthchop on with D3 it's not working.
Sensorless homing is turned on. I tried varying the speeds but nothing work.

; Smart Drivers
M569 P0.0 S1 D3 V188; driver 0.0 goes forwards (X axis)
M569 P0.1 S1 D3 ; driver 0.1 goes forwards (Y axis) 
M569 P0.2 S1 D3 ; driver 0.2 goes forwards (Z axis) 
M569 P121.0 S0 D3 ; driver 20.0 goes forwards (extruder 0)

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@jay_s_uk

I'm using a Mini 5+ under the 3.5.4 version.

Below my config.g:

; Default config.g template for DuetPi
; Replace this with a proper configuration file (e.g from https://configtool.reprapfirmware.org)

; Display initial welcome message
M291 P"You are operating an SBC image in standalone mode. Please see <a href=""https://www.duet3d.com/StartHere"" target=""_blank"">here</a> further information." R"Welcome to your new Duet 3!" S1 T0

; Enable PanelDue
M575 P1 B57600 S1

; Enable network
; M552 P0.0.0.0 S1

; Configuration file for RepRapFirmware on Duet 3 Mini 5+ Ethernet
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.5.8 on Fri Dec 13 2024 08:59:52 GMT-0500 (Eastern Standard Time)

; General
G90 ; absolute coordinates
M83 ; relative extruder moves
M550 P"Duet 3" ; set hostname
M915 X Y R0 F0 ; set sensorless homing

M302 P1   ; Allow cold extrusion

; Accessories
M575 P1 S0 B57600 ; configure PanelDue support

; Wait a moment for the CAN expansion boards to become available
G4 S2

; Smart Drivers
M569 P0.0 S1 D2 ; driver 0.0 goes forwards (X axis)
M569 P0.1 S1 D2 ; driver 0.1 goes forwards (Y axis)
M569 P0.2 S1 D2 ; driver 0.2 goes forwards (Z axis)
M569 P121.0 S0 D2 ; driver 20.0 goes forwards (extruder 0)

; Motor Idle Current Reduction
M906 I30 ; set motor current idle factor
M84 S30 ; set motor current idle timeout

; Axes
M584 X0.0 Y0.1 Z0.2 ; set axis mapping
M350 X16 Y16 Z16 I1 ; configure microstepping with interpolation
M906 X800 Y800 Z800 ; set axis driver currents
M92 X80 Y80 Z400 ; configure steps per mm
M208 X-6:310 Y0:310 Z-5:405 ; set minimum and maximum axis limits
M566 X900 Y900 Z12 ; set maximum instantaneous speed changes (mm/min)
M203 X6000 Y6000 Z180 ; set maximum speeds (mm/min)
M201 X500 Y500 Z20 ; set accelerations (mm/s^2)

; Extruders
M584 E121.0 ; set extruder mapping
M350 E16 I1 ; configure microstepping with interpolation
M906 E800 ; set extruder driver currents
M92 E100 ; configure steps per mm
M566 E120 ; set maximum instantaneous speed changes (mm/min)
M203 E3600 ; set maximum speeds (mm/min)
M201 E250 ; set accelerations (mm/s^2)

; Kinematics
M669 K0 ; configure Cartesian kinematics

; Probes

M950 P0 C"out6"                              ; Set servo output on Mini 5+ 
M558 P9 H6 F250:30 T8000 C"^!io6.in"            ; Set probe input to IO_6 on Mini 5+
G31 P500 X0 Y0 Z0                                  ; set Z probe trigger value, offset and trigger height

;M950 S0 C"121.io0.out"                              ; Set servo output on Rototoolboard
;M558 P9 H6 F250:30 T8000 C"^!121.io0.in"            ; Set probe input to IO_0 on Rototoolboard
;G31 P500 X0 Y0 Z0                                  ; set Z probe trigger value, offset and trigger height

; Endstops
M574 X1 S3                            ; configure X axis endstop
M574 Y1 S3                            ; configure Y axis endstop
M574 Z1 S2                            ; configure Z axis endstop
M915 X Y R0 F0

; Tools
M563 P0 S"MainExtruder" D0 ; create Tool 0 using Extruder Drive 0
G10 P0 S0 R0 ; set Tool 0 active and standby temperatures to 0
T0 ; select Tool 0 at startup

Thanks for your help!