Duet 3 3 z motors config

  • Help needed.

    I am trying to set up a core xy with 3 z motors. And I think I have sent myself insane trying to set it up. Not much point posting my config files as I have edited it so many times, I go cross eyed trying to figure out what I have done. But nothing has worked so far.

    So if any of you kind people could share your config etc files, so I could compare to what I have, I would really appreciate it.



  • Moderator

    @mattbaker Are you using a Duet 3 6HC with 3HC expansion board? What seems to be the problem?


  • @mattbaker said in Duet 3 3 z motors config:

    I am trying to set up a core xy with 3 z motors.

    normally you do not need to do more than add the extra motors to the M584 line like
    M584 X0 Y1 Z2:4:5 E3

    current acceleration etc. is the same for all z motors

    see this article for more information and extra stuff

  • Moderator

    @mattbaker One of the gotchas on Duet 3 wiring is that the motor driver layout:

    2 3
    1 4
    0 5


    2 5
    1 4
    0 3

    Make sure the motors are plugged into the right headers!


  • Ive wired the steppers correctly, found that one out the hard way.

    I'm trying to get the 3 axis levelling working.

  • @droftarts I'm trying to get the 3. axis levelling working. I'm using the Duet 3 6HC. without the expansion board at present.

  • Moderator

    @mattbaker Okay. See the link @Veti posted earlier. You need the following for bed levelling with 3 independent Z motors:

    • to know which motor driver links to which leadscrew, eg Z2 is front left, Z3 is back centre, Z4 is front right
    • Leadscrew position defined by M671, in the order the leadscrews are defined by M584!
    • Change bed.g to probe as near as possible to each leadscrew

    For details, see https://duet3d.dozuki.com/Wiki/Bed_levelling_using_multiple_independent_Z_motors#Section_Example_for_3_motors


  • Ive gone back through it and changed the config however I keep getting g30: some computed corrections exceed limit of 5.00.

    Ive tried changing the limit, you see in some videos distances of 20+ mm, and it just seems to get ignored.

    M671 X480:230.0:-30 s100 Y460.0:-40:460 S100

  • @mattbaker your m671 doesn’t look right.

    Here’s mine. For reference the order of the z axis motors are one on the left is motor one, motor on the back right is two, motor on the front right is the third. All commands are listed/referenced with that order. I also always include a pin map in the beginning of my config.g as an easy reference.

    ; Configuration file for Duet3 (firmware version 3.0 RC2)
    ; executed by the firmware on start-up
    ; --------------- Pin/connection Mapping Legend -------------------
    ; out0 - Bed heater
    ; out1 - Extruder 1 heater
    ; out2
    ; out3
    ; out4 - Radiator cooling fan - WC heatsink
    ; out5
    ; out6
    ; out7
    ; out8 - Parts cooler on printhead
    ; out9 - Duet board cooling fan
    ; out4.tach - Radiator cooling fan rpm wire - WC heatsink
    ; out5.tach
    ; out6.tach
    ; io0.in
    ; io1.in - X min active low endstop switch
    ; io2.in - Y max active low endstop switch
    ; io3.in - Z probe type to bltouch - DEPRECATED
    ; io4.in - Z probe type to PIEZO
    ; io5.in - Emergency stop switch
    ; io6.in
    ; io7.in
    ; io8.in
    ; io0.out
    ; io1.out
    ; io2.out
    ; io3.out - GPIO port 0 on IO3, servo mode - BLTouch Z-Probe
    ; io4.out
    ; io5.out
    ; io6.out
    ; io7.out
    ; io8.out
    ; servo, out10 (only on v0.5, not on v0.6)
    ; pson
    ; spi.cs0
    ; spi.cs1
    ; spi.cs2
    ; spi.cs3
    ; temp0 - Bed Thermistor
    ; temp1 - PT1000 for extruder 1
    ; temp2 - PT1000 for pi4
    ; temp3
    ; mcu-temp - MCU sensor
    ; -----------------------------------------------------------------
    ; General preferences

    G4 P2000 ; Hold your Horses.
    G90 ; send absolute coordinates...
    M83 ; ...but relative extruder moves
    G21 ; Set units to Millimeters
    M550 P"DUET3" ; set printer name

    M584 X0.3 Y0.2 Z0.0:0.1:0.4 E0.5 ; set drive mapping to each axis
    M669 K1 ; Select CoreXY mode - New format

    ; Network
    M552 S1 ; enable network
    M552 P192.168.3.120 ; Static IP Address
    M586 P0 S1 ; enable HTTP
    M586 P1 S0 ; disable FTP
    M586 P2 S0 ; disable Telnet

    ; Drives
    M569 P0.0 S0 ; physical drive 0 goes backwards - Z Axis Left (1)
    M569 P0.1 S0 ; physical drive 1 goes backwards - Z Axis Right Back (2)
    M569 P0.2 S0 ; physical drive 2 goes backwards - Y Axis
    M569 P0.3 S0 ; physical drive 3 goes backwards - X Axis
    M569 P0.4 S0 ; physical drive 4 goes backwards - Z Axis Right Front (3)
    M569 P0.5 S1 ; pyhsical drive 5 goes forwards - Extruder 1

    ; Set up three Z-axis location
    M671 X-52.5:377.5:377.5 Y162.5:282.5:42.5 S5 ; leadscrews at 1 - left, 2 - rear right and 3 - front right

    M92 X200.00 Y200.00 Z400.00 E1800 ; set steps per mm
    M350 X16 Y16 Z16 E16 I1 ; configure micro-stepping with interpolation
    M566 X1000.00 Y1000.00 Z400.00 E240.00 ; set maximum instantaneous speed changes (mm/min)
    M203 X24000.00 Y24000.00 Z2000.00 E1200.00 ; set maximum speeds (mm/min)
    M201 X10000.00 Y10000.00 Z400.00 E800.00 ; set accelerations (mm/s^2)
    M906 X1000 Y1000 Z1000 E800 I30 ; set motor currents (mA) and motor idle factor in percent*100
    M572 D0 S0.074 ; Set pressure advance
    M84 S30 ; Set idle timeout

    ; Axis Limits
    M208 X0 Y0 Z0 S1 ; set axis minima
    M208 X320 Y320 Z350 S0 ; set axis maxima

    ; Endstops

    M574 X1 S1 P"io1.in" ; X min active high endstop switch
    M574 Y2 S1 P"io2.in" ; Y max active high endstop switch

    ; Z-Probe - BLTouch - DEPRECATED
    ; M574 Z1 S2 ; set endstops controlled by probe
    ; M558 P9 C"^io3.in" H3 F60000 T10000 ; set Z probe type to bltouch and the dive height + speeds (bltouch NEEDS pullup)
    ; G31 P10 X28.5 Y-5 Z2.35 ; set Z probe trigger value, offset and trigger height

    ; Z-Probe - PIEZO
    M574 Z1 S2 ; set endstops controlled by probe
    M558 P8 C"io4.in" H5 F1000 T20000 ; set Z probe type to PIEZO and the dive height + speeds
    G31 P10 X0 Y0 Z-0.1 ; set Z probe trigger value, offset and trigger height

    G30 ; Probe Z

    ; Configure Heaters and Sensors
    M308 S0 P"temp0" Y"thermistor" A"Bed Temp" T100000 B3950 ; Configure bed temperature sensor
    M143 H0 S120 ; set temperature limit for heater 0 to 120C
    M308 S1 P"temp1" Y"pt1000" A"Extruder 1 Temp" ; Configure extruder 1 temperature sensor - PT1000 sensor
    M143 H1 S280 ; set temperature limit for heater 1 to 280C
    M308 S2 P"mcu-temp" Y"mcu-temp" A"Duet Board" ; Configure MCU sensor
    ; M308 S4 P"temp2" Y"pt1000" A"RPI" R2200 ;Pt1000 temp sensor for the raspberry pi

    ; Define Sensors and Fans
    M950 H0 C"out0" T0 ; Define heater 0 (bed heater) - bed_heat pin and Temp Sensor 0
    M950 H1 C"out1" T1 ; Define heater 1 (hot-end E0) to use the "e0_heat" pin and Temp Sensor 1

    ;Set PID values
    M307 H0 A253.9 C566.2 D1.0 V23.3 B0 ; disable bang-bang mode for the bed heater and set PWM limit
    M307 H1 A855.8 C368.4 D5.7 V23.3 B0 ; disable bang-bang mode for the extruder heater and set PWM limit

    M950 F0 C"out8" Q100 ; Define Fan_0 for use - Parts Cooler on Printhead - 4010 fan
    M950 F1 C"!out4+^out4.tach" Q25000 ; Define Fan_1 for use - Radiator cooling - WC heatsink. - PWM fan
    M950 F2 C"out9" Q25000 ; Define Fan_2 for use - Duet board cooling fan
    ; M950 S0 C"io3.out" ; Define GPIO port 0 on IO3, servo mode - BLTouch Z-Probe - DEPRECATED

    ; Fans
    M106 P0 S0 ; set fan 0. Parts Cooler on Printhead
    M106 P1 T25:40 H2 ; Set fan 1. Manages Radiator fan for water-cooled loop.
    M106 P2 T35:50 H2 ; Set fan 2. Manages Duet board fan.

    ; Tools
    M563 P0 S"Extruder 1" D0 H1 F0 ; define tool 0. Fan 0 operates with an active hot-end
    G10 P0 X0 Y0 Z0 ; set tool 0 axis offsets
    G10 P0 R0 S0 ; set initial tool 0 active and standby temperatures to 0C

    ; Emergency Stop
    M574 S1 P"^!io5.in" ; Define Emergency endstop - emergency stop switch condition
    M581 P"io5.in" T0 ; Define action to be taken with activation of emergency stop switch

    ; Miscellaneous
    T0 ; select first tool
    M501 ; Store parameters

  • @Nuramori Thanks for your help. I uploaded new files from the configurator, changed a few things, which I thought is what I had, and problem solved.

    No idea what the problem was, looks the same to me, but I'm not going to look a gift horse in the mouth.

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