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What is the difference between:

  • Tune -> Bed Z
  • Tune -> Babystep Z
  • Control -> Motion -> Z Offset

And when are you supposed to use "Bed Z"?

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  • Tune -> Bed Z

http://marlinfw.org/docs/features/lcd_menu.html#tune

Per description in this table, this refers to the Mesh Bed Leveling process. It allows to modify all saved mesh z-offsets by the given amount.

  • Tune -> Babystep Z

http://marlinfw.org/docs/gcode/M290.html

This just instructs the motor to move the given amount, once, without changing any parameters.

  • Control -> Motion -> Z Offset

http://marlinfw.org/docs/gcode/M851.html

Here we are talking about the offset of a z probe (e.g. BL-Touch) from the nozzle.

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  • $\begingroup$ Nice overview! Noteworthy might be that the parameters under "Tune" are only available during printing, so it is to adjust settings during printing. $\endgroup$
    – 0scar
    Nov 25 '19 at 11:38

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