You can obtain the necessary firmware from official or trusted community sources: Official Firmware : Historically available on the Sunlu Website (Version 3.40 is a common stable release). Official Archive : A copy of the official firmware is archived on GitHub by denizkoekden Custom Marlin
Later versions might offer a more responsive user interface. Prerequisites Before Updating
This guide provides a comprehensive overview of how to perform a , covering both official and community-based alternatives. Why Should You Update Your Sunlu T3 Firmware?
: Save your existing configuration or EEPROM settings if possible. Check Hardware Sunlu T3 Firmware Update
Before updating the firmware on your Sunlu T3, make sure you:
If you turn on the printer and it boots normally without updating, the issue is almost always one of two things:
Best for advanced users. Offers deeper customization and optimized menus. You can obtain the necessary firmware from official
Visit the official 3DSunlu website to locate the latest firmware, which as of the end of 2022 was version v3.40 24OCT22 .
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
Preparation prevents a bricked mainboard. Gather these items before proceeding: Why Should You Update Your Sunlu T3 Firmware
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.
To see your printer's current firmware version, you can send an M115 command to it. Using a USB connection and a program like Pronterface (often included on the printer's SD card) will return a string of information that includes the firmware name and compilation date. This data is very useful when confirming a successful update. For example, when checking a stock firmware, the printer might report details like: FIRMWARE_NAME:Marlin (Oct 9 2022 08:58:15) . This indicates that an older version of Marlin is currently installed.
Resolves mid-print freezing and resume-print glitches. Prerequisites: What You Need Before Starting
Once the update is complete, your Sunlu T3 is running the latest firmware. However, you have a few more steps before you can resume printing.