M48 Measure Z Probe repeatability and print to serial output.

  • That is useful for a lot of settings.... It is good to know your probe 😄

    Now what I do is use a macro to repeat a G30 S-1 several times and calculate the standard deviation and mean value by hand .

  • administrators

    Use a macro to execute repeated G30 Pn Xxx Yyy Z-9999 commands with values of n from 0 up to your chosen maximum. This is much more flexible, for example you can choose to move the head away and back between probing. You don't need to calculate the SD by hand because if you include S-1 on the last G30 command, the firmware will do it for you.

  • @dc42 I'll try it today. Thanks. 🙂

  • @dc42 said in M48 Measure Z Probe repeatability and print to serial output.:


    Worked like a charm... so.... No need for the M48.

    Maybe have a special area at the gcodes wiki page mentioning about commands alternatives - like the M109 or M48 in this case.

    Thank you very much.

    The macro:

    M291 P"Probe will be tested 10 times and return mean and standard deviation. Ok or Cancel?" R"WARNING" S3 ; User must click OK or cancel.
    G30 P0 X151 Y161 Z-9999
    G30 P1 X151 Y161 Z-9999
    G30 P2 X151 Y161 Z-9999
    G30 P3 X151 Y161 Z-9999
    G30 P4 X151 Y161 Z-9999
    G30 P5 X151 Y161 Z-9999
    G30 P6 X151 Y161 Z-9999
    G30 P7 X151 Y161 Z-9999
    G30 P8 X151 Y161 Z-9999
    G30 P9 X151 Y161 Z-9999 S-1


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