@Timothee-Leblond I have a couple printers with mixing extruders. In your last example with a mixing ratio of 0.02:1 Your printer will take the E value from the running gcode and you will get a total extrusion of 1.02 from a single nozzle. Not much different than setting the extrusion multiplier in the slicer to 1.02 on a normal printer. You might want to keep the total of all the extruder motors = to 1.00 when you add them both up in your M567 so that your commanded total extrusions are exactly what the running gcode specified.
If you have set the E-steps correctly on each motor then total extrusion should be accurate to what is commanded in the running gcode.
You can set M567 0.02:0.98 in the gcode file, in a macro, or in the command line as the print is running and it will change.
I don't recommend a setting one or the other motor at 0.00 as the motor at 1.00 will try to push some filament back up the unused side and could cause a blockage similar to heat creep.
I set both extruders to 0.50:0.50 in config.g just in case I accidentally send a print job without specifying the mix ratio.

; Tools
M563 P0 D0:1 H1 F1 S"Dual"                                   ; 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
M567 P0 E0.50:0.50  	                                     ; set mixing ratios for tool 0 Dual

Geoff

@Timothee-Leblond I'm the last guy you want to do calculations for you. I picked those numbers from the top of my head since they sounded close to what you wanted and are also useful to my mixing nozzles when trying to get a mostly pure color without clogs.

Geoff

@Timothee-Leblond I have a couple printers with mixing extruders. In your last example with a mixing ratio of 0.02:1 Your printer will take the E value from the running gcode and you will get a total extrusion of 1.02 from a single nozzle. Not much different than setting the extrusion multiplier in the slicer to 1.02 on a normal printer. You might want to keep the total of all the extruder motors = to 1.00 when you add them both up in your M567 so that your commanded total extrusions are exactly what the running gcode specified.
If you have set the E-steps correctly on each motor then total extrusion should be accurate to what is commanded in the running gcode.
You can set M567 0.02:0.98 in the gcode file, in a macro, or in the command line as the print is running and it will change.
I don't recommend a setting one or the other motor at 0.00 as the motor at 1.00 will try to push some filament back up the unused side and could cause a blockage similar to heat creep.
I set both extruders to 0.50:0.50 in config.g just in case I accidentally send a print job without specifying the mix ratio.

; Tools
M563 P0 D0:1 H1 F1 S"Dual"                                   ; 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
M567 P0 E0.50:0.50  	                                     ; set mixing ratios for tool 0 Dual

Geoff

For what it's worth, I just had a step timing error that I didn't expect with my simple printer.
Duet 3 Mini 5+ ethernet
300mm bed slinger with 2 independent Z steppers (G32)
I'm running older beta firmware: 3.6.0-beta.3+1 (Didn't have time to get the latest one before this print)

M122

2/27/2025, 9:48:15 PM	m122
=== Diagnostics ===
RepRapFirmware for Duet 3 Mini 5+ version 3.6.0-beta.3+1 (2025-01-20 20:03:10) running on Duet 3 Mini5plus Ethernet (standalone mode)
Board ID: UR3YN-N867A-G65J0-401GL-1192Z-ZYPRP
Used output buffers: 3 of 40 (20 max)
=== RTOS ===
Static ram: 94252
Dynamic ram: 111388 of which 0 recycled
Never used RAM 34604, free system stack 132 words
Tasks: NETWORK(1,ready,26.1%,176) ETHERNET(5,nWait 7,0.1%,554) ACCEL(6,nWait 6,0.0%,343) HEAT(3,nWait 6,0.0%,325) Move(4,invalid,0.2%,251) TMC(4,nWait 6,0.9%,65) CanReceiv(6,nWait 1,0.0%,939) CanSender(5,nWait 7,0.0%,336) CanClock(7,delaying,0.0%,334) MAIN(1,running,71.8%,649) IDLE(0,ready,0.0%,29) USBD(3,blocked,0.0%,147) AIN(4,delaying,0.8%,261), total 100.0%
Owned mutexes:
=== Platform ===
Last reset 01:46:42 ago, cause: power up
Last software reset at 2025-02-26 19:45, reason: User, Gcodes spinning, available RAM 36052, slot 2
Software reset code 0x0003 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x00000000 BFAR 0xe000ed38 SP 0x00000000 Task MAIN Freestk 0 n/a
Error status: 0x00
Aux0 errors 0,0,0
MCU temperature: min 20.4, current 40.6, max 44.1
Supply voltage: min 23.2, current 24.2, max 24.4, under voltage events: 0, over voltage events: 0, power good: yes
Heap OK, handles allocated/used 99/1, heap memory allocated/used/recyclable 2048/84/72, gc cycles 0
Events: 0 queued, 0 completed
Date/time: 2025-02-27 21:48:14
Slowest loop: 228.31ms; fastest: 0.14ms
USB interrupts 0
=== Storage ===
Free file entries: 19
SD card 0 detected, interface speed: 22.5MBytes/sec
SD card longest read time 5.3ms, write time 2.1ms, max retries 0
=== Move ===
Segments created 51, maxWait 552311ms, bed comp in use: mesh, height map offset 0.000, hiccups added 0/0 (0.00/0.00ms), max steps late 1, ebfmin 0.00, ebfmax 0.00
Pos req/act/dcf: 14738.00/13999/1.00 12297.00/12475/-0.00 2590.00/2583/1.00
no step interrupt scheduled
Driver 0: standstill, SG min 0, read errors 0, write errors 0, ifcnt 13, reads 9094, writes 13, timeouts 0, DMA errors 0, CC errors 0
Driver 1: standstill, SG min 0, read errors 0, write errors 0, ifcnt 13, reads 9094, writes 13, timeouts 0, DMA errors 0, CC errors 0
Driver 2: standstill, SG min 0, read errors 0, write errors 0, ifcnt 12, reads 9095, writes 12, timeouts 0, DMA errors 0, CC errors 0
Driver 3: standstill, SG min 0, read errors 0, write errors 0, ifcnt 12, reads 9095, writes 12, timeouts 0, DMA errors 0, CC errors 0
Driver 4: standstill, SG min 0, read errors 0, write errors 0, ifcnt 14, reads 9093, writes 14, timeouts 0, DMA errors 0, CC errors 0
Driver 5: not present
Driver 6: not present
=== DDARing 0 ===
Scheduled moves 67017, completed 66977, LaErrors 0, Underruns [0, 0, 0]
Segments left 1, axes/extruders owned 0x00000807, drives owned 0x00000807
Code queue is empty
=== DDARing 1 ===
Scheduled moves 0, completed 0, LaErrors 0, Underruns [0, 0, 0]
Segments left 0, axes/extruders owned 0x00000000, drives owned 0x00000000
Code queue is empty
=== Heat ===
Bed heaters 0 -1 -1 -1, chamber heaters -1 -1 -1 -1, ordering errs 0
=== GCodes ===
Movement locks held by null, null
HTTP is idle in state(s) 0
Telnet is idle in state(s) 0
File is doing "G1 X177.416 Y142.578 E.04886" in state(s) 0
USB is idle in state(s) 0
Aux is idle in state(s) 0
Trigger is idle in state(s) 0
Queue is idle in state(s) 0
LCD is idle in state(s) 0
SBC is idle in state(s) 0
Daemon is idle in state(s) 0
Aux2 is idle in state(s) 0
Autopause is idle in state(s) 0
File2 is idle in state(s) 0
Queue2 is idle in state(s) 0
=== CAN ===
Messages queued 30343, received 0, lost 0, ignored 0, errs 30272429, boc 0
Longest wait 0ms for reply type 0, peak Tx sync delay 0, free buffers 26 (min 26), ts 30343/0/0
Tx timeouts 0,0,30342,0,0,0 last cancelled message type 30 dest 127
=== Network ===
Slowest loop: 74.36ms; fastest: 0.04ms
Responder states: MQTT(0) HTTP(0) HTTP(0) HTTP(0) HTTP(0) FTP(0) Telnet(0)
HTTP sessions: 1 of 8
= Ethernet =
Interface state: active
Error counts: 0 0 0 0 0 0
Socket states: 6 2 2 2 2 0 0 0 0

My messy Config.g:

; Configuration file for Duet 3 Mini 5+ (firmware version 3.3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.3.10 on Sun May 15 2022 23:13:02 GMT-0500 (Central Daylight Time)

; General preferences
;M575 P1 S1 B57600                                     ; enable support for PanelDue
G90                                                   ; send absolute coordinates...
M83                                                   ; ...but relative extruder moves
M550 P"Anet A8 Plus"                                  ; set printer name
;M918 P1 E4 F2000000                                   ; configure direct-connect display
M575 P1 S2 B57600                                     ; Configure BTT TFT35 Display was S2

; Network
M552 P0.0.0.0 S1                                      ; enable network and acquire dynamic address via DHCP
M586 P0 S1                                            ; enable HTTP
M586 P1 S0                                            ; disable FTP
M586 P2 S0                                            ; disable Telnet

; Drives
M569 P0.0 S1 D3 V10                                 ;x physical drive 0.0 goes forwards WAS M569 P0.0 S1 Stealthchop D3= ON. is ON. V100 Max set to 5 to stay in spread cycle but quiet not moving. WAS V100
M569 P0.1 S1 D3 V10                                  ; y physical drive 0.1 goes forwards WAS M569 P0.1 S1 WAS V100
M569 P0.2 S0 D3 V10                                   ; z1 physical drive 0.2 goes backwards WAS V50. Changed to 10 to new Stealth idle and Spreadcycle moving
M569 P0.3 S0 D3 V10                                   ; z2 physical drive 0.3 goes BACKwards
M569 P0.4 S1                                          ; e1 physical drive 0.4 goes forwards
M584 X0.0 Y0.1 Z0.2:0.3 E0.4                          ; set drive mapping
M350 X16 Y16 Z16 E16 I1                               ; configure microstepping with interpolation WAS Z16:16
M92 X100 Y100 Z400.00 E370.00                          ; set steps per mm PLA/PETG M92 X100 Y100 Z400.00:400.00 E397.00 for Stock Hemera XS
M566 X600.00 Y600.00 Z100.00 E3000                    ; set maximum instantaneous speed changes (mm/min)  600 is 10mm/s 180 is 3mm/s set to 300=5mms Was: M566 X1200.00 Y1200.00 Z50.00 E3000 P1 
M203 X13000 Y13000 Z500 E10000.00                     ; set maximum speeds (mm/min)		XY was 6000 (100mms) was M203 X4800.00 Y4800.00 Z600:600 E10000.00  WAS 4800XY If Z is at 120 Blobs when moving to next layer
M201 X400 Y400 Z100 E10000                            ; set accelerations (mm/s^2)		XY was 1000 was M201 X400 Y400 Z50:50 E10000
M906 X850 Y850 Z850 E1000 I60                         ; set motor currents (mA) and motor idle factor in per cent  XS Peak current 1400 1.4A is Ninja Heat creap! Set E to 950-1000 (60-85% of 1.4A Peak)
M84 S30                                               ; Set idle timeout

; Axis Limits
M208 X-3 Y-1 Z-0.5 S1                                ; set axis minima WAS X-20 is too far right, change to 5 Tune, Y was -4 Need 9 total to get 0
M208 X300 Y295 Z350 S0                                ; set axis maxima SET Z to 380 to square gantry to frame. Measure and adjust leadscrews. Then Level bed to Gantry. WAS Y284

; Endstops
M574 X1 S1 P"io1.in"                                 ; configure active high endstop switch for low end on X (Duet 3) WAS"!Io1.in" Changed for NC switch 5-2024
M574 Y1 S1 P"io2.in"                                 ; configure active high endstop switch for low end on Y (Duet 3) WAS"!Io2.in" Changed for NC switch 5-2024
M574 Z1 S2                                           ; configure Z-probe endstop for low end on Z 

; Z-Probe
M950 S0 C"io3.out"                                   ; create servo pin 0 for BLTouch
M558 P9 C"^io3.in" H5 F120 T4000                     ; set Z probe type to bltouch and the dive height + speeds ;invert logic with ^
;G31 P500 X47 Y-12.5 Z3.95              ;REVO 0.40    set Z probe trigger value, offset and trigger height. X173 Y148 to mesh center. Decrease Z to move further from bed. WAS REVO 40 3.95. 025 was 3.70
G31 P500 X47 Y-12.5 Z3.75               ;REVO CHT 0.40
M557 X51:252 Y20:285 P5   ;Adjust this to max probe area Y295 is no go
;M557 X20:290 S36 Y20:285 P9                         ; define mesh grid 9x9. Need to take into effect Probe Offset 3-5-23

; Heaters
M308 S0 P"temp0" Y"thermistor" T100000 B4725 C7.06e-8 ; configure sensor 0 as thermistor on pin temp0
M950 H0 C"out0" T0                                    ; create bed heater output on out0 and map it to sensor 0
M307 H0 B0 S1.00                                      ; disable bang-bang mode for the bed heater and set PWM limit
M140 H0                                               ; map heated bed to heater 0
M143 H0 S90                                           ; set temperature limit for heater 0 to 90C
M308 S1 P"temp1" Y"thermistor" T100000 B4725 C7.06e-8 ; configure sensor 1 as thermistor on pin temp1
M950 H1 C"out1" T1                                    ; create nozzle heater output on out1 and map it to sensor 1
M307 H1 B0 S1.00                                      ; disable bang-bang mode for heater  and set PWM limit
M143 H1 S260                                          ; set temperature limit for heater 1 to 260C

; Fans
M950 F0 C"out6" Q500                                  ; create fan 0 on pin out3 and set its frequency
M106 P0 S0 H-1 X0.95                                  ; set fan 0 value. Thermostatic control is turned off. Limit fan to 95%
M950 F1 C"out5" Q500                                  ; create fan 1 on pin out4 and set its frequency
M106 P1 S1 H1 T45                                     ; set fan 1 value. Thermostatic control is turned on.  WAS M106 P1 S1 H-1  Want M106 P1 S1 H1 T45

; Tools
M563 P0 S"AnetA8P" D0 H1 F0                           ; 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

; Custom settings are not defined

;Inedependant Z leadscrew leveling
M671 X363:-67 Y150:150 S2.5                         ; Swap X values since correction went wrong direction. Just goes too far in opposite direction. Was S1.0 can go back if all start code has g32
;M671 X-67:363 Y150:150 S1.0                          ; Leadscrews at left (connected to Z) and right (connected to E1) of X axis.
;M671 X44:296 Y150:150 S0.5                          ; Seems to need Z probe offset added?
;M671 X-44:252 Y150:150 S0.5



;M572 D0 S0.005 									;Set pressure advance for Ninjaflex
M572 D0 S0.025                                        ;Test PA 0.025 starting. Was 0.030. changed to 0.015 7-25-24 Was 0.10 10-30-24
;M572 D0 S0.050                                        ;Ninja Test for PA. doubled it to reduce pressure in nozzle
; Miscellaneous
;M501                                                  ; load saved parameters from non-volatile memory

; INPUT SHAPING
M955 P0 C"spi.cs2+spi.cs1" ; all wires connected to temp DB connector, no temperature daughterboard. Default is I20 for Y on this printer
;M955 P0 C"spi.cs2+spi.cs1" I20 ; Change Ixx to what orientation Accelerometer is on X on this printer
;M593 P"ZVDDD" F37 ; use ZVD input shaping to cancel ringing at 40.5Hz  Look at L pararmeter. 1 ZVD, 2 MZV. Y is 37 ish Hz   *********Disabled for Ninjaflex low speed testing

;Mesh compensation height
;M376 H5                                              ;Set mesh compensation to stop at Z10 Should be at least 20x maximum error in Heightmap csv H4.5 is 0.225 error on bed
;M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000"    ; set voltage thresholds and actions to run on power loss

;Heater PID
M307 H0 R0.168 K0.350:0.000 D2.09 E1.35 S1.00 B0
M307 H1 R3.807 K0.431:0.411 D1.84 E1.35 S1.00 B0 V23.8  ;Revo HemeraXS S240

T0                                                    ; select first tool

The only thing I changed tonight from the last prints on this printer was to put:

M572 D0 S0.050

Into the console before the print so I could see what a different PA value would do for my 85A TPU print at a low (25 mm/s) print speed before I dedicate a value in config.g

I hope this might be useful.

Geoff

I usually preheat the nozzle and bed before I print. I'm guessing that you don't preheat your nozzle and let the gcode do it for you. The printer will wait for the bed to heat up to 60 with M190 S60. But the G10 S205 after that won't be waited for. You can edit the gcode and add M116 after G10 S205 and it should wait for 205C to be reached before it continues. I'm sure there's a better way around it.

I'm not sure your endstop setting is correct.
I checked your wiring and pins and they look good to me for your board.
I'm running a Maestro board that had 3.4.6 and now 3.5RC1.
It has A moving bed with an optical endstop at the bottom of the printer and I use a BL-touch for Z0 when the bed is up top twords the nozzle.
My endstops are:

M574 X1 S1 P"!xstop"                            ; configure switch-type (e.g. microswitch) endstop for high end on X via pin xstop WAS S1 Changed for Promega with mechanical X endstop 4-11-22
M574 Y2 S1 P"ystop"                            ; configure switch-type (e.g. microswitch) endstop for high end on Y via pin ystop. This is an optical sensor.
M574 Z2 S1 P"zstop"                            ; configure switch-type (e.g. microswitch) endstop for high end on Z via pin zstop. This is an optical sensor.

So if you have a mechanical switch at the other end I'd try

M574 Z1 S1 P"zstop"

Hope this helps.

I've had some issues with this on one of my printers. Make sure the pin is straight like Phaedrux said. Also, sometimes very fine strings of filament can get into where the pin slides and make it stick. If you pull the pin in and out, you shouldn't feel any restriction. On my problem printer I also added a M558 R delay to the probe and that seemed to help a bit.

M558 P9 C"^zprobe.in" H5 F120 T6000 R1 B0

With R1 I have a 1 second delay.
Of course, this isn't official advice, just some things I have tried.

@Phaedrux Amazon USA. Shipping label from 3DMakerWorld. Edit: Last week.

@Phaedrux I have a V1.01

I just picked up a Duet 3 Mini 5+ last week. It had the macro on it and of course I clicked it by accident. I had to redo all my setup from the previous day.

I commented out the macro after it bit me once. I got through all that and am running my first test print now.```
;test completed macro for mini 5+ v1.0 testing
;M30 "0:/sys/config.g"
;M30 "0:/sys/config.g.bak"
;M471 S"0:/sys/config_default.g" T"0:/sys/config.g" D1
;M30 "0:/macros/SETNETWORK14"
;M30 "0:/macros/SETNETWORK24"
;echo "Test macros deleted - restart"