Sunlu T3 Firmware Update

: Official updates are hosted on the Sunlu Website or shared via their Official Facebook Page . Version 3.40 is a common stable target for official users.

Turn off the printer, remove the SD card, and check the file name. The mainboard will not flash the same filename twice. Change the name slightly (e.g., from update.bin to firmware1.bin ) and try again. Ensure the card is strictly formatted to FAT32. The Printer Ignores the Update File

| Problem | Likely Fix | |---------|-------------| | Screen stays blank | Wrong file name or board type – rename to firmware.bin and retry. | | Printer boots but version unchanged | SD card not FAT32, or file not on root. | | Touchscreen no longer works | You flashed a firmware without touchscreen support. Revert to previous version. | | Thermal runaway error | Your thermistor settings changed. Double‑check wiring and reflash correct version. | Sunlu T3 Firmware Update

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.

Sometimes a firmware update changes the default offsets for the leveling probe. : Official updates are hosted on the Sunlu

Navigate through the printer menu to or About Printer to verify that the firmware version number has changed.

Before flashing new software onto your mainboard, gather these essential items: The mainboard will not flash the same filename twice

The Sunlu T3 is largely based on the Makerbase MKS Robin Nano V1.3/V1.4 board, which runs a customized version of Marlin firmware. Updating the firmware can resolve issues like layer shifting, thermal runaway false alarms, LCD glitches, or add new features (e.g., filament runout sensor improvements).

You cannot successfully perform a Sunlu T3 firmware update without knowing exactly which motherboard and screen you have. Sunlu has produced multiple revisions of the T3.

to access the bottom electronics enclosure. Remove the screws securing the mainboard cover.