Sunlu T3 Firmware Update

Sunlu sometimes changes the internal mainboard components during production runs. Installing firmware meant for a different board version will cause a black screen. and unplug the printer.

But for many users, the word "firmware" triggers anxiety. Will it brick the printer? Which file do you download? What about the screen? This article serves as your complete encyclopedia for everything related to the Sunlu T3 firmware update, from identifying your current version to advanced troubleshooting.

Select or Reset EEPROM , followed by Load Settings . This clears out old, conflicting data blocks from your previous firmware. Troubleshooting Common Installation Failures The Screen Stays Blank Permanently

Write this down. You will need it to confirm the update succeeded. Sunlu T3 Firmware Update

Your hotend and bed behave differently with new firmware. Run: M303 E0 S200 C8 (Hotend PID tune at 200°C) M303 E-1 S60 C8 (Bed PID tune at 60°C) Save the output values using M301 and M304 .

Visit the official Sunlu download page or your chosen community GitHub repository.

Always clear the old memory configurations after an upgrade to avoid erratic machine behavior. But for many users, the word "firmware" triggers anxiety

Whether you are looking to fix existing bugs or upgrade to a customized Marlin or Klipper configuration, this guide covers everything you need to know. Why You Should Update Your Sunlu T3 Firmware

Independent developers host updated Marlin distributions on GitHub specifically tuned for the Sunlu T3. These configurations unlock advanced features like Input Shaping (reducing ghosting vibrations) and Linear Advance (sharpening clean corners). Switching to Klipper

Insert the prepared MicroSD card into the printer's card slot. Turn on the power switch. What about the screen

If the screen does not boot up after two minutes, the flash likely failed.

Updating firmware on the Sunlu T3 can improve performance, fix factory bugs, and unlock features like increased hotend temperatures or optimized bed leveling. Official Version v3.40 (released Oct 2022) Firmware Type Marlin 2.0 Primary Method microSD Card (Auto-update on boot) Key Hardware STM32F103 MCU (32-bit) Preparation & Requirements Before beginning, ensure you have the following: MicroSD Card: Must be formatted to with a small allocation size (e.g., 4096 bytes). Firmware File: file named exactly firmware.bin for official/custom Marlin, or specifically configured for Official Downloads: Available via the Sunlu Support Page (v3.40 is the latest stable official release). Update Procedure (SD Card Method) Obtain the correct file for your specific machine version. Ensure the microSD card is clean and formatted to FAT32. Copy the file to the root of the SD card and rename it to firmware.bin Turn off the printer. Insert the SD card into the printer's slot.