machines/systems/flexibot/docs/marlin/_gcode/G425.md

tag	title	brief	author	experimental	requires	group	codes	notes	parameters	examples
g425	Backlash Calibration	Use a conductive object to calibrate XYZ backlash	marcio-ao	true	CALIBRATION_GCODE	calibration	G425	Requires `CALIBRATION_GCODE` and the following parameters: - `CALIBRATION_MEASUREMENT_RESOLUTION` determines the increments taken in mm when performing measurements. - `CALIBRATION_FEEDRATE_SLOW`, `CALIBRATION_FEEDRATE_FAST` and `CALIBRATION_FEEDRATE_TRAVEL` determine the speed of motion during the calibration. - `CALIBRATION_NOZZLE_TIP_HEIGHT` and `CALIBRATION_NOZZLE_OUTER_DIAMETER` refer to the conical part of the nozzle tip. - `CALIBRATION_REPORTING` enables `G425 V` for reporting of measurements. - `CALIBRATION_OBJECT_CENTER` and `CALIBRATION_OBJECT_DIMENSIONS` define the true location and dimensions of a cube/bolt/washer mounted on the bed. - `CALIBRATION_MEASURE_RIGHT`, `CALIBRATION_MEASURE_FRONT`, `CALIBRATION_MEASURE_LEFT` and `CALIBRATION_MEASURE_BACK` define the usable touch points. Comment out any sides which are unreachable by the probe. For best results, all four sides should be reachable. - `CALIBRATION_PIN`, `CALIBRATION_PIN_INVERTING`, `CALIBRATION_PIN_PULLDOWN` and `CALIBRATION_PIN_PULLUP` configure the pin used for calibration. For example, if the nozzle is grounded, the calibation cube would be connected to a digital input pin with a pull-up enabled.	tag optional description B true Perform calibration of backlash only. tag optional description values T true Perform calibration of one toolhead only. tag type index int tag optional description V true Probe cube and print position, error, backlash and hotend offset. (Requires `CALIBRATION_REPORTING`) tag optional description values U true Uncertainty: how far to start probe away from the cube (mm) tag type linear float	pre code Check positional accuracy before calibration (Requires `CALIBRATION_REPORTING`): T1 ; Switch to second nozzle G425 V ; Showing positional report for T1 T0 ; Switch to first nozzle G425 V ; Showing positional report for T0 pre code Perform automatic calibration: G425 ; Perform full calibration sequence M425 F1 S0 ; Enable backlash compensation at 100% pre code Check positional accuracy after calibration (Requires `CALIBRATION_REPORTING`): T1 ; Switch to second nozzle G425 V ; Validate by showing report for T1 T0 ; Switch to first nozzle G425 V ; Validate by showing report for T0

This command performs an automatic calibration of backlash, positional errors, and nozzle offset by touching the nozzle to the sides of a bed-mounted, electrically-conductive object (e.g., a cube, washer or bolt).

This command measures backlash but doesn't enable backlash correction. Use M425 to enable backlash correction.