Sunlu T3 Firmware Update Jun 2026

If you continue to experience problems, the SUNLU community is a great resource. They have a dedicated SUNLU Community where you can share feedback, report issues, and seek advice from other users.

Once Klipper connects successfully to your mainboard, you can easily run automated Input Shaping tests using an accelerometer to tune out vibrations, allowing the T3 to comfortably push past 150mm/s–200mm/s with pristine surface finishes. Troubleshooting Common Update Failures

Performing a is the single most effective way to unlock new features, fix bugs, improve print quality, and add safety features like thermal runaway protection.

Unlock capabilities like Linear Advance (for sharper corners) and custom PID tuning. Sunlu T3 Firmware Update

Run a PID calibration for both the heated bed and the hotend. This stabilizes temperature fluctuations, preventing banding lines on your prints.

This guide covers why, when, and how to update the Sunlu T3 (and closely related Sunlu models) firmware safely, how to prepare, step‑by‑step instructions for common update methods, troubleshooting, and rollback/verification tips.

Before you begin, check your current firmware version by navigating to on your printer’s screen. This ensures you are actually installing a newer version. 2. Prepare the MicroSD Card If you continue to experience problems, the SUNLU

Klipper utilizes the computing power of an external Raspberry Pi or computer to calculate precise print movements, allowing the Sunlu T3 to hit its 250mm/s limit with much cleaner visual results. To do this, you will compile the Klipper firmware file via your Pi, load it onto the MicroSD card, and flash the T3 board using the same steps outlined above.

The printer requires a specific format to recognize the update file: Insert the SD card into your computer. Format it as 4096 allocation unit size Ensure the card is empty before proceeding. 4. Flash the Printer Rename the File : Ensure the downloaded firmware is named exactly firmware.bin

exactly. If you have updated before, ensure the name is different from the previous update (e.g., firmware_v2.bin ) as the board may ignore a filename it has already "seen". Copy to SD Card file in the root directory (not inside any folders) of your formatted Micro SD card. Flash the Printer the printer. Unplug any USB cables connected to the printer. Troubleshooting Common Update Failures Performing a is the

The official Sunlu firmware is often months behind the mainline Marlin branch. For experts, compiling your own firmware allows for custom boot screens, advanced power loss recovery, and Input Shaping.

Resetting the EEPROM clears out old data cache from the previous firmware, preventing strange behavioral bugs. Troubleshooting Common Update Failures

Have a successful update story or a problem not listed? Let us know in the comments.

Select the appropriate micro-controller architecture determined during your mainboard check (e.g., STMicroelectronics STM32 or GigaDevice GD32).