Struggling with Z-Probe

  • Hi togehter,

    I decided to retrofit my Kodak Portrait Core XY from a Raspberry Pi / Smoothiboard Combo to Duet.
    I replaced the board and hooked up all the components.
    My Board is DUET 2 Wifi (3.1.1) and a PanelDue 5i.

    I got nearly everything to work except my Z-Probe.
    The Z-Probe is my active Nozzle and the Dashboard shows when the Nozzle is triggered Z-Probe "1000", if not triggered "0".
    Z-Probe is connected to IN and GND.

    I cannot get my Home-z to work and don´t know what I do wrong.

    The home x and y are running without any problem.
    As soon as I want to Z-Probe my Bed the bed just moves down by 5mm and then 2mm (See code line 6 and 10). It doesnt even move towards my nozzle.
    Wherever the position of Z is the printer will set Z0 on there.


    G1 X105 Y105 F2000
    G1 H2 Z5 F200
    G1 H1 Z-300 F500
    G1 Z5 F250
    G1 H1 Z-300 F100
    G92 Z0           
    G1 Z2 F100


    M208 X0 Y0 Z0 S1
    M208 X215 Y210 Z235 S0
    M558 P5 I1 C"^" H3 F120 T6000
    G31 P500 X0 Y0 Z0

    I am sure this is a classical ERROR-40 but I don´t get it. And inbetween I changed a lot of things to get it work.

    Could anybode please give me a hint?

    The printer is a Core XY with Endstop in X+ and Y+. Lowering the bed is Z+ direction. I also have a Z+ Endstop which I deactivated (maybe I will use it in future as a emergency stop).

    If I should post more Codes or information please let me know.

    best wishes and tank you in advance


  • G30 should be used to probe the bed and not G1 H1 moves.

    Here is an example of my homez.g file using a probe

    ; homez.g
    ; called to home the Z axis
    ; generated by RepRapFirmware Configuration Tool v3.1.4 on Tue Sep 22 2020 14:08:43 GMT+0100 (British Summer Time)
    G91 															; Relative mode
    G1 H2 Z5 F5000													; Lower the bed
    G90																; Back to absolute positioning
    G1 X160 Y130 F10000 		 										; Move to the center of the bed
    ; ################# Home Z Preparation ################
    M558 F250 				 										; Set the probing speed
    G30					 											; Probe a single point
    M558 F30 				 										; Set a slower probing speed
    G30					 											; Probe a single point

  • ...jay_s_uk

    Thanks a lot.
    I changed the code and it wors.
    I used my Endstop before to home Z and just thougth I could change the direction.


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