I have been messing with the backlash setting in Marlin and got it dialed in pretty well for the belt driven triple Z axis on my printer.
I noticed there is a setting for automatic calibration using an electrically conductive cube or other metal part.
How is the metal calibration cube and nozzle wired? I imagine you run one 5V lead to the cube and one to the nozzle, so it closes the circuit when they touch?
Also, does anyone have any idea on how to define the 5V trigger in these settings? I would think it would be the #define CALIBRATION_PIN -1. I am running the BTT Octopus v1.1 board with the latest Marlin bugfix.
//#define CALIBRATION_GCODE
#if ENABLED(CALIBRATION_GCODE)
//#define CALIBRATION_SCRIPT_PRE "M117 Starting Auto-Calibration\nT0\nG28\nG12\nM117 Calibrating..."
//#define CALIBRATION_SCRIPT_POST "M500\nM117 Calibration data saved"
#define CALIBRATION_MEASUREMENT_RESOLUTION 0.01 // mm
#define CALIBRATION_FEEDRATE_SLOW 60 // mm/min
#define CALIBRATION_FEEDRATE_FAST 1200 // mm/min
#define CALIBRATION_FEEDRATE_TRAVEL 3000 // mm/min
// The following parameters refer to the conical section of the nozzle tip.
#define CALIBRATION_NOZZLE_TIP_HEIGHT 1.0 // mm
#define CALIBRATION_NOZZLE_OUTER_DIAMETER 2.0 // mm
// Uncomment to enable reporting (required for "G425 V", but consumes PROGMEM).
//#define CALIBRATION_REPORTING
// The true location and dimension the cube/bolt/washer on the bed.
#define CALIBRATION_OBJECT_CENTER { 264.0, -22.0, -2.0 } // mm
#define CALIBRATION_OBJECT_DIMENSIONS { 10.0, 10.0, 10.0 } // mm
// Comment out any sides which are unreachable by the probe. For best
// auto-calibration results, all sides must be reachable.
#define CALIBRATION_MEASURE_RIGHT
#define CALIBRATION_MEASURE_FRONT
#define CALIBRATION_MEASURE_LEFT
#define CALIBRATION_MEASURE_BACK
//#define CALIBRATION_MEASURE_IMIN
//#define CALIBRATION_MEASURE_IMAX
//#define CALIBRATION_MEASURE_JMIN
//#define CALIBRATION_MEASURE_JMAX
//#define CALIBRATION_MEASURE_KMIN
//#define CALIBRATION_MEASURE_KMAX
// Probing at the exact top center only works if the center is flat. If
// probing on a screwhead or hollow washer, probe near the edges.
//#define CALIBRATION_MEASURE_AT_TOP_EDGES
// Define the pin to read during calibration
#ifndef CALIBRATION_PIN
//#define CALIBRATION_PIN -1 // Define here to override the default pin
#define CALIBRATION_PIN_INVERTING false // Set to true to invert the custom pin
//#define CALIBRATION_PIN_PULLDOWN
#define CALIBRATION_PIN_PULLUP
#endif
#endif
