Sunlu T3 Firmware Update

Before starting, ensure you have a standard microSD card (8GB to 32GB is ideal) formatted to

| | Likely Cause | Fix | |---|---|---| | Printer ignores the firmware file | microSD card not FAT32, or file not named firmware.bin exactly | Re‑format the card (FAT32, 4096 byte allocation), re‑copy the file. | | LCD stays blank after power‑on | Wrong firmware file for your mainboard revision | Confirm you downloaded the correct file for the Sunlu T3 (not a different model). | | Printer freezes during update | Power interruption or corrupted firmware file | Repeat the update with a freshly downloaded file and a stable power source. | | Z‑offset or bed leveling lost after update | This is expected behaviour | Re‑do the paper‑test Z‑offset and run a new ABL mesh (see next section). | | Jam detection triggers falsely | Known bug in V3.40 firmware | Turn off jam detection in the LCD menu ( Configuration > Jam > OFF ). | | Extruder cooling fan stays off when hotend is heating | Stock firmware fan pin mapping issue | Consider switching to the community Marlin build (see Advanced section). |

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Updating your Sunlu T3 firmware can bring several benefits, including: 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 .

Activates Thermal Runaway Protection to prevent fire hazards.

Turn off your Sunlu T3 completely and unplug the power cable for safety. Before starting, ensure you have a standard microSD

The bootloader changes the file extension from .bin to .CUR after a successful flash. Check the SD card on your computer; if it is still .bin , the printer did not read it. Try a different SD card under 16GB. Alternative Options: Marlin vs. Klipper

This can "brick" the motherboard, requiring a replacement chip or board.

Before updating, you need to know what version you are currently running to see if an update is necessary. | | Z‑offset or bed leveling lost after

To ensure the new firmware settings take effect without conflicting with old data, you must clear the configuration memory (EEPROM).

Sunlu occasionally changes internal components during production runs. Unplug your printer, remove the bottom cover, and look at the version number printed directly on the green or blue motherboard. You must download firmware that matches this exact board version. Step 2: Source Your Firmware You have two primary routes for sourcing your new firmware: