[solved] Duet Crash on probing

  • Hello everybody,

    I just receive my board this morning and I wiring it on my smartalu this evening with more or less problems.
    Every things seems to be properly connected, end stop and inductive prove recognize but I have a trouble with my bed auto leveling. When I launch it through the web interface, the printer move, home X, Y, probe 5 points and then crash …

    Thanks a lot for your help,

    with the error :

    Communication Error
    An AJAX error has been reported, so the current session has been terminated.
    Please check if your printer is still on and try to connect again.
    Error reason: SyntaxError: Unexpected token a in JSON at position 65

    Here my bed.g

    ; Auto calibration routine for delta printers
    ; Before running this, you should have set up your zprobe Z offset to suit your build, in the G31 command in config.g.
    M561						; clear any bed transform, otherwise homing may be at the wrong height
    G31 X0 Y0					; don't want any probe offset for this
    G28							; home the printer
    ;*** Remove the following line if your Z probe does not need to be deployed
    ;M98 Pdeployprobe.g			; deploy the mechanical Z probe
    ; The first time the mechanical probe is used after deployment, it gives slightly different results.
    ; So do an extra dummy probe here. The value stored gets overwritten later. You can remove this if you use an IR probe.
    ;G30 P0 X0 Y0 Z-99999
    ; Probe the bed and do 6- or 7-factor auto calibration
    G30 P0 X15 Y15 Z-99999 H0			; X tower
    G30 P1 X170 Y15	Z-99999 H0			; between X and Y towers
    G30 P2 X170 Y170 Z-99999 H0			; Y tower
    G30 P3 X15 Y170	Z-99999 H0			; between Y and Z towers
    G30 P4 X90 Y90 Z-99999 S4			; Z tower
    ;*** Remove the following line if your Z probe does not need to be retracted
    ;M98 Pretractprobe.g				; retract the mechanical Z probe
    G1 X10 Y10 Z10 F8000			; get the head out of the way of the bed

  • administrators

    You need to probe clockwise around the bed, not anticlockwise. I've heard before that probing the wrong way causes problems, but I wasn't aware that it could cause the web interface to disconnect.

    You may wish to use mesh bed levelling instead because it allows a much larger number of probe points. See https://duet3d.com/wiki/Using_mesh_bed_compensation.

  • Thanks a lot for your quick answer, now it works !

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