Incomprehensible problem



  • Hello everyone,
    Well I still have a problem with my DUET WIFI, I think earlier that it is a problem of setting, but I can not understand what I do wrong …
    So I could not calibrate my nozzle properly,
    That is my way of doing things.

    1: I lower the nozzle until touching a sheet of paper on the tray.

    2: I look at the value of Z for example "1,50",

    3: I put the g code G92 Z0, the value of the Z axis changes to 0,

    4: I go into the config file and here:
    Z probe and compensation definition
    ; *** If you have a switch instead of an IR probe, change P1 to P4 in the following M558 command
    M558 P1 X0 Y0 Z0; Z probe is an IR probe and is not used for homing any axes
    G31 X0 Y0 Z1.50 P500; Set the zprobe height and threshold (put your own values here),
    I get my value find here 1.50.

    Once that is done if I try to do a G1 Z0 F3000, my nozzle will sink into the tray,

    Do you have an idea,
    Thank you



  • What is the Z value when the nozzle touch the surface when you have Z1.50?
    Maybe try setting Z-1.5 in your G31 instead.

    I always have trouble dealing with the +/-, all I have done was trial and error 😛
    Someone else could probably give you a more scientific approach



  • thank you for your reply,
    Not the value is +1.50.
    I am forced to go up the buzzard so it's much more I think.



  • do you have a Z Probe?
    If so what type is it?



  • Yes I have a BL TOUCH



  • I believe the offset is only applied during the probing calculation, so you need to do another calibration before the offset is actually applied to the max print height.



  • The value for Z in the G31 line needs to equal the hight of the nozzle above the bed when the BLtouch triggers.



  • If my BL Touch is too high this can be a problem?



  • Well I'm really fooling with this machine,
    It's been 3 whole days now that I try to do something with it but without success,
    I think I will leave it aside and continue with my BLACK WIDOW that works really well,
    One last question before I go through the window: what distance do you put between the BL TOUCH when the probe is in and the nozzle?
    Is there a risk in making an update of the DUET WIFI,
    Thank you for your patient


  • administrators

    @synergy41:

    If my BL Touch is too high this can be a problem?

    Yes, it could be so high that it doesn't trigger before the nozzle hits the bed.

    With any Z probe, you should always test it, measure it's trigger height and put that value in the G31 command in config.g before you try to use it for homing of bed probing.



  • Hello,
    I'm still looking for my calibration problem.
    I do not know what is wrong,
    So here is the method that I practice,
    1 - I lower my head until I catch a sheet on the board,
    2- I then make a G92 Z0
    3- I raise the head to about 50mm
    4- I release the BL TOUCH
    5- I lower the head until the BL TOUCH goes up and lights up
    6- I open my config file and change the value here;
    Z probe and compensation definition
    ; *** If you have a switch instead of an IR probe, change P1 to P4 in the following M558 command
    M558 P1 X0 Y0 Z0; Z probe is an IR probe and is not used for homing any axes
    G31 X0 Y0 Z1.65 P500; Set the zprobe height and threshold (put your own values here),

    And when the machine restarts I make G1 Z0 F1500 and the head come to sink a big blow in the plate,

    What am I doing wrong?
    Thank you



  • for a start you have your config set for a IR Probe and not a BLtouch there is a thread on here about how to use a BL Touch.



  • I created a mount for my BLTouch that's connected to my Duet WiFi and included a number of Duet WiFi configuration/script files. It works good and you should be able to use them for a reference and the macro files to run your BLTouch.

    https://www.thingiverse.com/thing:2389034

    John



  • Thank you for your answers, I'll look at it later; I have to look at another problem "I really have no luck with this machine"
    I miss the update of the DUET WIFI


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