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I recently built a new 3d printer from Wanhao i3Plus and ramps 1.4 board with RepRap 12864 full graphic smart controller/LCD display. Modified the board to handle 24V pwr supple by removing/bridging both poly fuses and installed inline fuses. Also removed voltage regulator feeding Arduino Mega(now externally powered). Read that MOSFET’s should be replaced but did not replace because not that knowledgeable on them. Installed Marlin Firmware adjusting settings mostly from referencing copy of firmware from original board. After many tweaks in Marlin, I’ve been able to print many prints(unsymmetrical) over last couple months. No problems. About a week ago it suddenly began printing models mirrored across Y direction. This began after i purposely mirrored and object in Cara. I cleared the model and loaded different STL file and it displayed correctly in Cura, however printed mirrored across y-axis. This problem continues till present. I have experimented and checked everything I can think of and have ran out of possible solutions. Any suggestions are greatly appreciated. Below is a list of experiments and troubleshooting steps already taken.

  • Reloaded marlin.
  • Uninstalled and reinstalled Cura.
  • Created different unsymmetrical models, same.
  • Loaded various models in Simplify3D and same problem. Displays correct, prints mirrored.
  • Checked all wiring. Even switched out y-axis connectors.
  • Switched out all stepper drivers with extra driver, never been installed.
  • Removed inline fuses and wired direct to board.
  • Flipped/reversed y-stepper connector, bed crashed into the front, with no min-end-stop(flipped back connector).
  • Moved y-axis max end-stop from back to front of printer(changed from y-max to
    y-min pin) and inverted y-axis in config.h. This worked and printed correctly. However, this made y-axis control movements, and home position(FL to BL) backwards. After adjusting settings in Marlin to compensation for the change, right back to original problem.