Sunlu T3 Firmware Update [work] <2026>

To update the firmware on your , you will primarily use an SD card to flash a file directly to the printer's 32-bit motherboard. 1. Prepare Your Hardware

Option B: Sunlu Facebook Group (Fastest) The Sunlu 3D Printer User Group on Facebook is very active. The community moderators often pin the latest firmware files for the T3, S8, and S9 in the "Files" section or "Announcements." Sunlu T3 Firmware Update

Verify & Reset: Once the main menu appears, go to Configuration > Advanced Settings and select Store Settings or Load Defaults to ensure the new firmware parameters are active. Important Post-Update Tips To update the firmware on your , you

Custom (Marlin): Community members have archived the official firmware on GitHub and created custom Marlin versions that fix issues like fan mapping or bed leveling. Prepare the microSD Card: Format another SD card (FAT32, 4096 bytes)

: If you are switching to Klipper, a configuration file is available on 3. Update Procedure

  1. Format another SD card (FAT32, 4096 bytes). The screen is very sensitive to card size—4GB is ideal.
  2. Copy the DWIN_SET folder (or the specific T3 screen folder) directly to the root of the SD card. Do not rename the folder.
  3. Power off the printer.
  4. Insert the SD card into the screen’s SD slot (located on the back edge of the T3’s screen unit, not the mainboard slot).
  5. Power on the printer. The screen will turn blue, then show a progress bar or a series of colored flashes (red, blue, green). Wait until the calibration crosshair appears.
  6. Touch the crosshair to calibrate (if required).
  7. Remove the SD card and power cycle the printer.

Final Thoughts

Updating the Sunlu T3’s firmware is straightforward if you follow the steps above. While the printer works well out of the box, a modern firmware can iron out small annoyances and occasionally add useful features like M600 filament change or better mesh bed leveling.

  • Motor directions reversed: change axis_invert in firmware or invert wiring.
  • Thermistor errors: confirm thermistor type in firmware; check wiring and ADC channels.
  • Bed/Hotend temps off: run PID tune and confirm thermistor table.
  • SD card not recognized after flash: reformat FAT32, move firmware file if needed.
  • If display blank: ensure display firmware or driver is compatible; some TFTs need a matching firmware file.
    1. Visit the official Sunlu website: Go to the official Sunlu website (www.sunlu.net) and navigate to the support or downloads section.
    2. Select your printer model: Choose your Sunlu T3 model from the list of available printers.
    3. Find the firmware update: Locate the firmware update section and find the latest version available for your printer.
    4. Download the firmware file: Click on the firmware file to download it to your computer. The file should be in a format such as .bin or .hex.