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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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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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