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M915: TMC Z axis calibration

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    The command aims to align the ends of the X gantry (for a Průša i3-style printer). Here’s a

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    Using the given current, Marlin will move the Z axis (at homing speed) to the top plus a given extra distance. Since this intentionally stalls the Z steppers, you should use the minimum current required to move the axis.
    Z is then re-homed to correct the position.
    This command is deprecated. Use Z_STEPPER_AUTO_ALIGN instead.
    Requires TMC_Z_CALIBRATION and at least one TMC driver for Z axis.
    If Z_DUAL_STEPPER_DRIVERS is used, both should be TMC drivers.
    M915 [S<mA>] [Z<linear>]
    Current value to use for the raise move. (Default: CALIBRATION_CURRENT)
    Extra distance past Z_MAX_POS to move the Z axis. (Default: CALIBRATION_EXTRA_HEIGHT)
    Related Media

    Set a 300mA current and press the gantry against the top for 5 extra mm.
    G21 ; Units to mm
    M915 S300 Z5
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