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I recently burnt out one of the MOSFETS on my RAMPS 1.4 board on my Sintron Kossel clone so have upgraded it to a RAMPS 1.6. Now my printer seems to only print 50 % of the intended size.

After the machine homes it only comes down about 50 % of the distance and so starts printing in mid air.

I thought it might have been the driver steps? The DRV 8825 drivers are 32 steps instead of 16. I changed this value in the firmware but it didn't make any difference.

Any suggestions?

0scar
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Scott Lipsham
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    What did you actually change than? You should adjust the steps per mm. If you go from 16 microsteps to 32 microsteps you need to send more steps (twice) to achieve the same distance to travel. – 0scar Jun 11 '22 at 15:53

2 Answers2

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Data from Firmware is not written into EEPROM on its own after updating your firmware. You need to send a M502 to "seed" the firmware numbers as that is restoring the "default" settings in it. If you are unsure what is currently the EEPROM setting, use M503 first.

Trish
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If you changed you stepper drivers here's a list to check:

  1. Microstepping Jumpers
  2. In Marlin Configuration.h:
  • X_DRIVER_TYPE, Y_DRIVER_TYPE, Z_DRIVER_TYPE and
    E0_DRIVER_TYPE
  • DEFAULT_AXIS_STEPS_PER_UNIT
  • INVERT_X_DIR, INVERT_Y_DIR, INVERT_Z_DIR and INVERT_E0_DIR
  1. In Marlin Configuration_adv.h:
  • MINIMUM_STEPPER_POST_DIR_DELAY, MINIMUM_STEPPER_PRE_DIR_DELAY, MINIMUM_STEPPER_PULSE, MAXIMUM_STEPPER_RATE
  • Other driver-specific constants
  1. EEPROM settings stored on the control board (use M503 to read current settings).
Eduard Sukharev
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