Sunlu T3 Firmware Update File
Updating your Sunlu T3 firmware is a critical maintenance step that can resolve common "out-of-the-box" bugs, improve print stability, and unlock advanced features like refined high-speed printing . Whether you are sticking with official releases or exploring custom Marlin builds, this guide covers everything you need to successfully update your Terminator 3. Why Update Your Sunlu T3 Firmware? Modern firmware acts as the "brain" of your printer, and the stock T3 often ships with older versions that lack certain optimizations. Bug Fixes: Newer versions address issues with jam detection and LCD refresh rates . Enhanced Thermal Safety: Updates can refine the extruder cooling fan behavior, ensuring it stays on whenever the hotend is heated—not just when motors are moving. Performance Optimization: Improved versions better manage the 250mm/s "Fast Print" mode , reducing under-extrusion. Advanced Features: Custom firmware can unlock 5x5 Automatic Bed Leveling (ABL) grids and manual PID tuning for both the bed and hotend. Preparation: Choosing Your Firmware Before you begin, decide which path is right for your technical comfort level: sunlu 3d - Facebook
Updating the firmware on your is a straightforward process that uses an SD card to flash the printer's 32-bit motherboard. The T3 is often considered an Ender 3 clone and uses a motherboard similar to the SKR E3 Mini V2. 1. Preparation Before starting, ensure you have a standard microSD card (8GB to 32GB is ideal) formatted to : Save your existing configuration or EEPROM settings if possible. Check Hardware : Note your current firmware version in the printer's "About" menu to confirm the update later. 2. Download Firmware You can obtain the firmware from official or community sources: Official Website : Download the latest Sunlu T3 32-bit Firmware (e.g., version 3.40 or newer) from the Official Sunlu Download Page Community/Custom : For advanced features like 5x5 Bed Leveling or higher nozzle temperatures (up to 285°C), you can use custom Marlin builds from sites like Printables : If you are switching to Klipper, a configuration file is available on 3. Update Procedure
Updating the firmware on a Sunlu T3 (also known as the "Terminator 3") is often a necessary step for enthusiasts because the stock firmware has several known limitations, including fan mapping errors and disabled PID tuning for the bed. The T3 is essentially a modified Ender 3 clone using a 32-bit board similar to the BTT SKR Mini E3 V2. Available Firmware Options Depending on your comfort level with tinkering, you have three primary paths: Official Sunlu Firmware : 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. Community Custom Firmware : Developers have released optimized Marlin versions that fix bugs found in the original code, such as incorrect extruder fan mapping where the fan only ran when motors were active rather than when the hotend was hot. You can find these on GitHub and Printables . Self-Compiled Marlin : Since the T3 uses a standard architecture, you can compile your own firmware using the Marlin Configurations repository for the Sunlu T3, allowing for features like 5x5 grid bed leveling and higher hotend temperatures (up to 285°C) if you have an all-metal hotend. Installation Procedure The T3 updates via a microSD card inserted directly into the motherboard slot at the front of the printer. Format the Card : Use a microSD card formatted to FAT32 with an allocation unit size of 4096 . Prepare the File : Copy the .bin firmware file to the root directory of the card. Ensure it is the only .bin file present. Flash the Printer : Turn off the printer. Insert the microSD card. Power on the printer. The screen will remain blank for several seconds while the light on the motherboard flashes. Once the main menu appears, the update is complete. Post-Update Reset : It is highly recommended to select "Restore Defaults" and then "Store Settings" (EEPROM) after flashing to ensure old settings do not conflict with the new firmware. Key Improvements in Updated/Custom Firmware Fixed Fan Control : Corrects the error where the hotend cooling fan fails to turn on during stationary heating. PID Bed Tuning : Enables more stable bed temperatures, which Sunlu curiously left disabled in many stock versions. Enhanced Leveling : Expands the Automatic Bed Leveling (ABL) to a more precise 5x5 grid. Thermal Safety : Custom versions often include refined thermal runaway protection and higher temperature limits for upgraded hardware. Troubleshooting Common Issues sunlu 3d - Facebook
Firmware Update: A Complete Guide The is a high-speed FDM 3D printer known for its "Terminator" speed claims, but staying on the cutting edge of its performance often requires a firmware refresh. Whether you are troubleshooting bugs or looking to unlock advanced Marlin features, updating your firmware is the best way to optimize your machine. Why Update Your Sunlu T3 Firmware? Updating is crucial for fixing known factory issues and enhancing usability: Bug Fixes : Early versions sometimes had cooling fan mapping errors where the extruder fan only turned on when motors were active. Thermal Safety : Newer versions often include improved PID tuning for both the bed and hotend to maintain stable temperatures. Advanced Features : Updates can unlock Linear Advance , S-curve acceleration, and more precise 5x5 Auto Bed Leveling (ABL) . Speed Optimization : Newer firmware better handles the "Fast Print" mode, which targets speeds up to 250mm/s . Step-by-Step Update Procedure uses a modified BTT SKR Mini E3 V2 Go to product viewer dialog for this item. clone board, making the update process straightforward via microSD card. 1. Prepare Your Firmware File SUNLU T3 3D Printer Review. Get to know your "Terminator"! Sunlu T3 Firmware Update
Updating the firmware on a Sunlu T3 (also known as the "Terminator") is a common procedure used to resolve issues like z-axis squashing , enabling PID tuning , or adding advanced Marlin features . The Sunlu T3 uses a 32-bit controller board that is largely a clone of the BigTreeTech SKR Mini E3 V2 , which makes it highly compatible with standard Marlin firmware. Finding the Firmware You can choose between official stock firmware or community-modified versions depending on your needs: Official Stock Firmware : Sunlu provides firmware files on their official website or through their Official Facebook Support . Version v3.43 is a notable overseas release that supports both Chinese and English. Custom Community Firmware : Many users prefer custom builds to unlock features like 5x5 Automatic Bed Leveling (ABL) or higher hotend temperatures (up to 285°C). Popular community sources include: Kaot93's Custom Firmware : Available on Printables , this build improves bed tramming and filament runout detection. Anson Liu’s Marlin Configuration : For users who want to compile their own, Anson Liu provides a Marlin 2.0 configuration that fixes bugs like the extruder cooling fan being misassigned. GitHub Archives : General archives of the official firmware can also be found on GitHub for developer use. Update Procedure (SD Card Method) The Sunlu T3 features a bootloader that allows for easy updates via the microSD card slot. SUNLU T3 Marlin Configuration and Controller Board Pictures
To update the firmware on your , you will primarily use an SD card to flash a file directly to the printer's 32-bit motherboard. 1. Prepare Your Hardware 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 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 : For advanced features like better fan control or refined Z-offset menus, community-optimized versions are available on Printables by Kaot93 3. Format the SD Card 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 . If the file has a long string of numbers or dates, the printer may not recognize it. Copy to SD : Move the firmware.bin file to the root directory of the SD card (not inside any folders). : Turn off your Insert Card : Insert the Micro SD card into the printer’s card slot. : Turn the printer on. The screen will remain blank for about 15–30 seconds while it flashes the new code. : Once the main menu appears, go to About Printer to verify the new version number. Printables.com Important Post-Update Steps Reset EEPROM : It is highly recommended to go to Configuration > Restore Defaults Store Settings immediately after updating to ensure old settings don't conflict with new firmware. : Re-calibrate your Z-offset and level the bed, as these settings are often cleared during a flash. custom Marlin profile for the Sunlu T3 to enable specific features like Linear Advance denizkoekden/SUNLU-T3 - Marlin 3D Printer Firmware - GitHub
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). Updating your Sunlu T3 firmware is a critical
Before You Begin – Identify Your Hardware There are two main hardware versions of the Sunlu T3. Using the wrong firmware will brick your printer.
Older version: MKS Robin Nano V1.3 board (STM32F103ZET6 chip) Newer version: MKS Robin Nano V1.4 board (STM32F407ZET6 chip)
How to check: Open the electronics case under the printer and read the text on the main board. Alternatively, contact Sunlu support with your serial number. Modern firmware acts as the "brain" of your
What You Will Need
A microSD card (8GB or 16GB, formatted to FAT32 , 4096-byte allocation unit). A USB card reader for your computer. The correct firmware file for your T3 version ( .bin file). The correct LCD screen firmware (optional – for touch/filament issues).
