Sunlu T3 Firmware Update Today

Once completed, the standard user interface home screen will load. Step 4: Reset EEPROM

Download the exact firmware version matching your mainboard version (usually printed directly on the Sunlu mainboard surface). If the file is inside a .zip archive, extract it.

: Turn the printer on. The screen will remain blank for about 15–30 seconds while it flashes the new code. : Once the main menu appears, go to About Printer to verify the new version number. Printables.com Important Post-Update Steps Reset EEPROM : It is highly recommended to go to Configuration > Restore Defaults Store Settings

If you are updating your firmware to achieve maximum speed, consider moving away from stock Marlin firmware entirely and flashing . Sunlu T3 Firmware Update

The Sunlu T3 motherboard can only read cards formatted to FAT32 with a 4096-byte allocation size.

is non-negotiable. While the T3 shipped with it enabled, later firmware versions have refined the algorithms to reduce false positives while still shutting down the printer if the thermistor fails. This prevents potential fire hazards.

A .bin file specifically compiled for the Sunlu T3 mainboard. Once completed, the standard user interface home screen

Before flashing new software onto your printer, gather the following essential tools:

| Problem | Likely Cause | Solution | |--------|--------------|----------| | Nothing happens when powering on | Wrong firmware version (e.g., V1.4 file on V1.3 board) | Double-check board version. Revert to older known-good firmware. | | Screen stays blue indefinitely | SD card not formatted correctly | Reformat FAT32, 4096 bytes. Use a smaller card (≤16GB). | | Printer shows “No printer attached” | LCD firmware mismatch | Update LCD firmware separately, matching the main board update. | | Filament sensor stopped working | New firmware has different pin assignment | Check Sunlu T3 community config files (e.g., from Team Fugu or official GitHub). | | Update “bricked” the printer | Bad flash or power loss during update | Use an ST-Link programmer (V2) to recover the MKS Robin Nano board. |

Look at the printed text on the mainboard (e.g., look for version numbers like v1.x or specific chip identification like STM32 or GD32). : Turn the printer on

If your printer did not update or displays a blank blue screen, do not panic. Try these troubleshooting steps: The Printer Boots Normally but Didn't Update The motherboard did not recognize the file.

Downloaded directly from the official Sunlu website or verified community repositories (like GitHub if you are flashing custom Marlin or Klipper). Step-by-Step Guide to Updating Sunlu T3 Firmware