Home travelling in wrong direction regardless of Z_HOME_DIR

Stiofan · November 2021

I have rebuilt a modified kit printer, a delta with 200mm heated bed and chimera extruder (2 in, 2 out). I am currently working on the initial FW setup and have encountered a problem.

The 3 max endstops and z-probe (z-min, a piezo sensor fitted over extruder 0) are triggering correctly when manually activated with M119.
Manually moving x, y and z directions are moving as expected (pre-tuning), but when I send a HOME command the head moved towards the bed instead of the top of the towers.
I have tried to change the direction using Z_HOME_DIR set to both 1 & -1 (the initial value was 1) making sure to toggle the EEPROM_SET from 1 to 2 and back. There has been no change in the direction that the head travels when HOME'd though.

I had the printer working well when it was set up before I added the extra extruder, but I'm not even at the point of testing the extruder motors yet. Any help would be appreciated at this point.

These are the sections from Configuration.h which I believe are relevant, if any others would be of use I can upload them:

#define DRIVE_SYSTEM 3

#define XAXIS_STEPS_PER_MM 80

#define YAXIS_STEPS_PER_MM 80

#define ZAXIS_STEPS_PER_MM 80

#define X_ENABLE_ON 0

#define Y_ENABLE_ON 0

#define Z_ENABLE_ON 0

#define DISABLE_X 0

#define DISABLE_Y 0

#define DISABLE_Z 0

#define DISABLE_E 1

#define PREVENT_Z_DISABLE_ON_STEPPER_TIMEOUT

#define INVERT_X_DIR 0

#define INVERT_Y_DIR 0

#define INVERT_Z_DIR 0

#define X_HOME_DIR -1

#define Y_HOME_DIR -1

#define Z_HOME_DIR -1

#define X_MAX_LENGTH 200

#define Y_MAX_LENGTH 200

#define Z_MAX_LENGTH 269.2

#define X_MIN_POS 0

#define Y_MIN_POS 0

#define Z_MIN_POS 0

#define DISTORTION_CORRECTION 1

#define DISTORTION_CORRECTION_POINTS 5

#define DISTORTION_CORRECTION_R 90

#define DISTORTION_PERMANENT 1

#define DISTORTION_UPDATE_FREQUENCY 15

#define DISTORTION_START_DEGRADE 0.5

#define DISTORTION_END_HEIGHT 1

#define DISTORTION_EXTRAPOLATE_CORNERS 1

#define DISTORTION_XMIN 10

#define DISTORTION_YMIN 10

#define DISTORTION_XMAX 190

#define DISTORTION_YMAX 190

#define FEATURE_BABYSTEPPING 1

#define BABYSTEP_MULTIPLICATOR 1

#define DELTA_SEGMENTS_PER_SECOND_PRINT 180 // Move accurate setting for print moves

#define DELTA_SEGMENTS_PER_SECOND_MOVE 70 // Less accurate setting for other moves

#define EXACT_DELTA_MOVES 1

// Delta settings

#define DELTA_DIAGONAL_ROD 216.5 // mm

#define DELTA_ALPHA_A 210

#define DELTA_ALPHA_B 330

#define DELTA_ALPHA_C 90

#define DELTA_RADIUS_CORRECTION_A 0

#define DELTA_RADIUS_CORRECTION_B 0

#define DELTA_RADIUS_CORRECTION_C 0

#define DELTA_DIAGONAL_CORRECTION_A 0

#define DELTA_DIAGONAL_CORRECTION_B 0

#define DELTA_DIAGONAL_CORRECTION_C 0

#define END_EFFECTOR_HORIZONTAL_OFFSET 0

#define CARRIAGE_HORIZONTAL_OFFSET 0

#define DELTA_MAX_RADIUS 90

#define ROD_RADIUS 110

#define PRINTER_RADIUS 124

#define DELTA_HOME_ON_POWER 0

#define STEP_COUNTER

#define DELTA_X_ENDSTOP_OFFSET_STEPS 0

#define DELTA_Y_ENDSTOP_OFFSET_STEPS 0

#define DELTA_Z_ENDSTOP_OFFSET_STEPS 0

#define DELTA_FLOOR_SAFETY_MARGIN_MM 15

//#define SOFTWARE_LEVELING

#define DELTASEGMENTS_PER_PRINTLINE 24

#define STEPPER_INACTIVE_TIME 360L

#define MAX_INACTIVE_TIME 0L

#define MAX_FEEDRATE_X 300

#define MAX_FEEDRATE_Y 300

#define MAX_FEEDRATE_Z 300

#define HOMING_FEEDRATE_X 40

#define HOMING_FEEDRATE_Y 40

#define HOMING_FEEDRATE_Z 40

#define HOMING_ORDER HOME_ORDER_ZXY

#define ZHOME_MIN_TEMPERATURE 0

#define ZHOME_HEAT_ALL 1

#define ZHOME_HEAT_HEIGHT 20

#define ZHOME_X_POS 0

#define ZHOME_Y_POS 0

#define ENABLE_BACKLASH_COMPENSATION 1

#define X_BACKLASH 0

#define Y_BACKLASH 0

#define Z_BACKLASH 0

#define RAMP_ACCELERATION 1

#define STEPPER_HIGH_DELAY 0

#define DIRECTION_DELAY 0

#define STEP_DOUBLER_FREQUENCY 12000

#define ALLOW_QUADSTEPPING 1

#define DOUBLE_STEP_DELAY 1 // time in microseconds

#define MAX_ACCELERATION_UNITS_PER_SQ_SECOND_X 1000

#define MAX_ACCELERATION_UNITS_PER_SQ_SECOND_Y 1000

#define MAX_ACCELERATION_UNITS_PER_SQ_SECOND_Z 1000

#define MAX_TRAVEL_ACCELERATION_UNITS_PER_SQ_SECOND_X 1000

#define MAX_TRAVEL_ACCELERATION_UNITS_PER_SQ_SECOND_Y 1000

#define MAX_TRAVEL_ACCELERATION_UNITS_PER_SQ_SECOND_Z 1000

#define INTERPOLATE_ACCELERATION_WITH_Z 3

#define ACCELERATION_FACTOR_TOP 60

#define MAX_JERK 20

#define MAX_ZJERK 0.3

#define PRINTLINE_CACHE_SIZE 16

#define MOVE_CACHE_LOW 10

#define LOW_TICKS_PER_MOVE 250000

#define EXTRUDER_SWITCH_XY_SPEED 100

#define DUAL_X_AXIS 0

#define FEATURE_TWO_XSTEPPER 0

#define X2_STEP_PIN ORIG_E1_STEP_PIN

#define X2_DIR_PIN ORIG_E1_DIR_PIN

#define X2_ENABLE_PIN ORIG_E1_ENABLE_PIN

#define FEATURE_TWO_YSTEPPER 0

#define Y2_STEP_PIN ORIG_E1_STEP_PIN

#define Y2_DIR_PIN ORIG_E1_DIR_PIN

#define Y2_ENABLE_PIN ORIG_E1_ENABLE_PIN

#define FEATURE_TWO_ZSTEPPER 0

#define Z2_STEP_PIN ORIG_E1_STEP_PIN

#define Z2_DIR_PIN ORIG_E1_DIR_PIN

#define Z2_ENABLE_PIN ORIG_E1_ENABLE_PIN

#define FEATURE_THREE_ZSTEPPER 0

#define Z3_STEP_PIN ORIG_E2_STEP_PIN

#define Z3_DIR_PIN ORIG_E2_DIR_PIN

#define Z3_ENABLE_PIN ORIG_E2_ENABLE_PIN

#define FEATURE_DITTO_PRINTING 0

#define USE_ADVANCE 0

#define ENABLE_QUADRATIC_ADVANCE 1

Thanks in advance

Repetier · November 2021

Z_HOME_DIR 1
is the correct solution.

Does M119 show 3 max end stops?

Sure manual moves move z correctly? Often this is a user error assuming host arrow means something different. When above homes to z min set

#define INVERT_X_DIR 0

#define INVERT_Y_DIR 0

#define INVERT_Z_DIR 0

to 1 instead, then it will move to top. Then test again if moving down moves down ro what
M114
returns after homing. When it returns z max value the setting is now correct.

Stiofan · November 2021

Thanks for your speedy response.

You were correct, I had the host printer setting inverting the z control display, so I was misreading as a false positive.

I followed your advice and inverted the x, y & z directions and then HOME went to the correct location and read the endstops correctly.

I really like how the firmware is very fast to compile and flash. Much faster than Marlin, on my system.

Thanks again

Home travelling in wrong direction regardless of Z_HOME_DIR

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