M300 command "Unknown command"

  • Hi,

    i have my new Ender 5 pro with BLtouch. i have install de V4.2.2 firmware that is in the download section (https://www.creality.com/download). I need the buzzer to work but when i put the M300 command in my Gcode nothing happens. I am debugging the error and when i conected to my PC i found that the answer to the M300 command is:

    "Unknown Command: "M300"".


  • You need 2 things for your 3D printer to be able to make sounds;
    i) an audio device such as a loud speaker or a simple buzzer
    ii) a version of firmware that supports control of an audio device

    My printer has Marlin v1.1.6.0 firmware and a simple buzzer (so only produces sounds at one fixed frequency). Full details here: http://captainbodgit.blogspot.com/2021/05/my-bleepin-3d-printer.html

    If you are confident that you are using the M300 command correctly, then the next step is to work out whether your printer is capable of making sounds.

    If it does make sounds when printing and object, you could open the gcode file in a text editor and look through to see how it is doing it.

    If it never makes a sound ...well, it may just have been designed that way!

    Also take a look at the full Marlin documentation: https://marlinfw.org/docs/gcode/M300.html

  • It's happened to me too.

    Why, Creality?

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