Sunlu T3 Firmware Update Better Jun 2026

: For advanced features like 5x5 bed leveling and PID tuning, many users prefer Kaot93’s Custom Firmware on Printables Prepare the SD Card Format a MicroSD card to FAT32. Rename the file to firmware.bin (if it isn't already) and place it in the root directory. Flash the Printer Power off the printer. Insert the SD card into the front slot.

Visit the Sunlu official website (https://3dsunlu.com/en/NewsList/11.html) and download the latest firmware version V3.43. The file will be named firmware.bin .

Sunlu has released several batches of the T3. Some use a standard mainboard, while others (especially newer batches) use different chips. Flashing the wrong firmware can render your printer unusable until you replace the mainboard. sunlu t3 firmware update better

to prevent re-flashing on the next boot.

Unzip the downloaded file and copy the firmware.bin file directly to the root directory of the SD card. : For advanced features like 5x5 bed leveling

Ensure the motor is pushing exactly 100mm of filament when requested.

Updating the firmware significantly improves printer reliability and safety by addressing several flaws in the stock software. While the factory firmware offers a "Fast Print" mode (advertised at 250mm/s), users often find it lacks the necessary refinement for high-quality results. Key Improvements in Updated/Custom Firmware Insert the SD card into the front slot

into the LCD’s own SD card slot (often located on the back of the display board or on the side of the screen housing).

The printer might not recognize the firmware file name. Rename the file to something short and unique (e.g., update123.bin ) and try again.

The default firmware uses a highly customized, locked-down version of Marlin. This prevents the printer from accurately communicating with modern slicers like OrcaSlicer, Bambu Studio, or newer versions of Cura, rendering advanced features useless. Major Benefits of Updating Your Firmware