Move from Marlin to repetier - Problem -

Tinchus2009

Hi, I decided to move from Marlin firmware to repetier firmaware. I have posted some other issues Im haveing but I have discovered a serious one now: I tried to do my firts print useing repetier firmware: the axis home ok... When it is time to start printing (bed and heater heated), Z axis homes as usual, when it reaches position 0 the axis trys to go up and in that moment is like the motor blocks and sound like a buz is heard.
I though it could be a hardware problem... but it is not. It was printing ok some hours ago . Despite that, I checked the hardware and it is ok. I tries a couple of time and it is the same result. I uploaded Marlin firmwre again and I could print.
So it is something related to the firmware I guess. Can you help me ? I have a prusa I3, arduino 2560, ramps 1,4

nutsgoweee

When homing, I know after the first time the switch is hit, the axis backs up and hits again slower to be more accurate. My Z-homing speed from the beginning default settings was very slow. It might be homing too slow and the reduction is too much or too slow for the z-axis. You might try increasing the Z-homing speed or changing ENDSTOP_Z_RETEST_REDUCTION_FACTOR

Repetier

The sound is most likely stepper loosing steps. The direction change might be too much, so try reducing z jerk or z acceleration. The combination seems to be too much while reversing direction but low enough for non reversing.

Tinchus2009

Ok, I have tested this:
- Increasing Z homing speed : fails too, in fact, the homeing speed in marlin is way faster of what I have tried with repetier
- Loosing steps: I have seen motors loosing steps, but this is different, the motor gets stucked
- reducing z-jerk: the original value is 0.3, I have lowered it to 0.2 and 0.1 . All fails
- Z acceleration (both travelling and homeing): the original value of 100 was reduced to 50 and even to 10. Failed
- reduceing z homeing speed: I have tried somethis as low as 1, and it fails. In Marlin default was 5 mm/s, and it works ok
- ENDSTOP_Z_RETEST_REDUCTION_FACTOR, set originlly to 3, reduce to 1 = failed, increased to 6 = failed

These are my setting:

#define ENDSTOP_PULLUP_X_MIN true
#define ENDSTOP_X_MIN_INVERTING true
#define MIN_HARDWARE_ENDSTOP_X true
#define ENDSTOP_PULLUP_Y_MIN true
#define ENDSTOP_Y_MIN_INVERTING true
#define MIN_HARDWARE_ENDSTOP_Y true
#define ENDSTOP_PULLUP_Z_MIN true
#define ENDSTOP_Z_MIN_INVERTING true
#define MIN_HARDWARE_ENDSTOP_Z true
#define ENDSTOP_PULLUP_X_MAX true
#define ENDSTOP_X_MAX_INVERTING false
#define MAX_HARDWARE_ENDSTOP_X false
#define ENDSTOP_PULLUP_Y_MAX true
#define ENDSTOP_Y_MAX_INVERTING false
#define MAX_HARDWARE_ENDSTOP_Y false
#define ENDSTOP_PULLUP_Z_MAX true
#define ENDSTOP_Z_MAX_INVERTING false
#define MAX_HARDWARE_ENDSTOP_Z false
#define max_software_endstop_r true

#define min_software_endstop_x false
#define min_software_endstop_y false
#define min_software_endstop_z false
#define max_software_endstop_x true
#define max_software_endstop_y true
#define max_software_endstop_z true
#define ENDSTOP_X_BACK_MOVE 5
#define ENDSTOP_Y_BACK_MOVE 5
#define ENDSTOP_Z_BACK_MOVE 2
#define ENDSTOP_X_RETEST_REDUCTION_FACTOR 3
#define ENDSTOP_Y_RETEST_REDUCTION_FACTOR 3
#define ENDSTOP_Z_RETEST_REDUCTION_FACTOR 3
#define ENDSTOP_X_BACK_ON_HOME 1
#define ENDSTOP_Y_BACK_ON_HOME 1
#define ENDSTOP_Z_BACK_ON_HOME 0
#define ALWAYS_CHECK_ENDSTOPS 1

// ################# XYZ movements ###################

#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 0
#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 185
#define X_MIN_POS 0
#define Y_MIN_POS 0
#define Z_MIN_POS 0
#define DISTORTION_CORRECTION 0
#define DISTORTION_CORRECTION_POINTS 5
#define DISTORTION_CORRECTION_R 100
#define DISTORTION_PERMANENT 1
#define DISTORTION_UPDATE_FREQUENCY 15
#define DISTORTION_START_DEGRADE 0.5
#define DISTORTION_END_HEIGHT 1
#define DISTORTION_EXTRAPOLATE_CORNERS 0
#define DISTORTION_XMIN 10
#define DISTORTION_YMIN 10
#define DISTORTION_XMAX 190
#define DISTORTION_YMAX 190

// ##########################################################################################
// ## Movement settings ##
// ##########################################################################################

#define FEATURE_BABYSTEPPING 1
#define BABYSTEP_MULTIPLICATOR 30

#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_HOME_ON_POWER 0

#define DELTASEGMENTS_PER_PRINTLINE 24
#define STEPPER_INACTIVE_TIME 60L
#define MAX_INACTIVE_TIME 0L
#define MAX_FEEDRATE_X 100
#define MAX_FEEDRATE_Y 100
#define MAX_FEEDRATE_Z 3 //5
#define HOMING_FEEDRATE_X 40
#define HOMING_FEEDRATE_Y 40
#define HOMING_FEEDRATE_Z 2
#define HOMING_ORDER HOME_ORDER_XYZ
#define ZHOME_MIN_TEMPERATURE 0
#define ZHOME_HEAT_ALL 1
#define ZHOME_HEAT_HEIGHT 20
#define ZHOME_X_POS 999999
#define ZHOME_Y_POS 999999
#define ENABLE_BACKLASH_COMPENSATION 0
#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 100
#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 100
#define INTERPOLATE_ACCELERATION_WITH_Z 0
#define ACCELERATION_FACTOR_TOP 100
#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 0

Roko

I don't have a prusa i3, I have a homebuilt cartesian printer w/ dual Z axes.. I noticed a couple of differences between your config and mine.

Always_check_endstops - mine is 0

Babystep_Multiplicatior - mine is 1

Actual speed of Z axis is 5. I tried: speed 4, this speed increase a very ugly noise comeing from the motors. Speed 3: both motor jam. Speed 2 works very nive, but it is slow?

RAyWB

you should set motor current matching to motor specs...don´t adjust by a "feeling" that cannot work.
refer pololu datasheet regarding reference voltage and motor specs also.
i don´t know your motors , but if they are in parallel connection on one driver , keep in mind
they only get half the current you adjust on pololu.