#define MM_PER_ARC_SEGMENT 0.05

(if laser on/off is swapped change  from #define LASER_ON_HIGH 1 to #define LASER_ON_HIGH 0 in configuration.h)

#define NUM_EXTRUDER 1

#define EVENT_SET_LASER(intensity) mySetLaser(intensity)

#define EVENT_INITALIZE_LASER { "my initialisation" ; return false;}

#define HEATED_BED_SENSOR_PIN TEMP_1_PIN

You said you had#define EXT0_TEMPSENSOR_PIN TEMP_0_PIN

#define EXT0_TEMPSENSOR_TYPE 1

@BlueRav3n I'm pretty sure Repetier is talking about the Tools section when using the on-line configuration tool. In my configuration.h after its been downloaded and extracted,#define EXT0_TEMPSENSOR_

#define FEATURE_FAN_CONTROL 1

#define FAN_PIN 9

#define FEATURE_AXISCOMP 1

#define FEATURE_AXISCOMP 1

#define CONFIGURATION_H

#define SUPPORT_LASER 1 // set 1 to enable laser support

Could not reproduce that error. DisplayList.h defines it#define UI_STATUS_UPD_F(status) {uid.setStatusP(status);uid.refreshPage();}

  #define SDSC 53

#define ENDSTOP_PULLUP_Z_MIN true

#define Z_HOME_DIR 1 which is Z max homing

//#define UI_DISPLAY_RS_PIN 32