Insert your microSD card into your computer and format it to FAT32 . Ensure it is completely empty.
Newer firmware versions include tighter safety algorithms to prevent overheating hazards.
Which or chip is currently inside your T3?
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. Sunlu T3 Firmware Update
Use an 8GB or 16GB card. High-capacity cards (32GB+) often fail to trigger the bootloader.
Use a high-quality card. Larger cards (64GB+) often fail to read correctly during the flashing process.
When the update is complete, the printer will either reboot itself or display a message indicating success. Insert your microSD card into your computer and
The Sunlu T3 is marketed as a fast printer (up to 250mm/s). Firmware optimizations ensure the stepper motors handle these speeds without losing steps.
Download the exact .bin file matching your specific motherboard version from the official Sunlu website or their official GitHub repository.
Format it to with an allocation unit size of 4096 bytes . Clear all other files from the card. Which or chip is currently inside your T3
uses a 32-bit ARM-based controller board (similar to a BTT SKR Mini E3 V2) . To perform the update, you need: Micro SD card (ideally 8GB or smaller). A computer to format the card and download files. 2. Download the Firmware File
Double-check whether your specific T3 build utilizes a normally-open (NO) or normally-closed (NC) circuit for the leveling probe, and update your firmware endstop logic to match. Conclusion
: If the official version doesn't meet your needs, there are community-maintained Marlin configurations on GitHub and Printables that enable features like improved 5x5 bed leveling.
This comprehensive guide covers why you should update, the preparation steps, and a step-by-step walkthrough to flash your firmware safely. Why Update Your Sunlu T3 Firmware?