#define DISTORTION_CORRECTION 1

#define Z_PROBE_X1 -69.28 #define Z_PROBE_Y1 -40 #define Z_PROBE_X2 69.28 #define Z_PROBE_Y2 -40 #define Z_PROBE_X3 0 #define Z_PROBE_Y3 80

#define ZHOME_X_POS 999999

#define ZHOME_X_POS 999999

#define MAX_FEEDRATE_Z 4

#define ZHOME_MIN_TEMPERATURE 0

You managed to get 0 virtual steps in a segment for a line that was long enough to be split. There is a check to rule out a 0 move caused by tiny distances in latest dev version. So first I#d upgrade

what about #define HEATED_BED_PREHEAT_TEMP 55.. should I set that to zero? Thanks again.. Richard 

#define HAVE_HEATED_BED 1

You must delete also the #defines which override old value that you want to keep. As programmer it was clear for me, but I know I did not say that.

#define SDSS            10

#define SDSS 10

#define X_MIN_POS -35

#define HOMING_ORDER HOME_ORDER_XYTZ

#define Z_PROBE_X_OFFSET -32

#define ENDSTOP_X_BACK_ON_HOME 35

        <rectangle color="#dddddd" xMax="220" xMin="0" yMax="220" yMin="0"/>

It's #define EXTRUDER_FAN_COOL_TEMP 50

#define EXT0_EXTRUDER_COOLER_PIN 6

#define Z_PROBE_DELAY delayInMc