To update the firmware on your Sunlu Terminator 3 (T3) , you typically need to
place a specifically named firmware file onto a MicroSD card and restart the printer
. The T3 uses a 32-bit controller board (similar to a BTT SKR Mini E3 V2 clone), which supports simple SD card flashing Update Instructions Prepare the SD Card
: Use a high-quality MicroSD card (ideally 8GB or 32GB). Format it to with a standard allocation unit size. Download Firmware : Obtain the official firmware from the Sunlu Support Site Custom/Marlin
: If you prefer the latest Marlin features or fixes (like proper fan assignments), you can find configuration files on the Marlin GitHub or pre-compiled community versions on Printables Rename the File : The firmware file must be named exactly firmware.bin . If the downloaded file has a different name (e.g., T3_V3.4.bin ), rename it before putting it on the card. Flash the Printer Turn the printer Insert the MicroSD card into the printer's slot. Turn the printer
The screen will stay blank for 10–30 seconds while the board updates. Once finished, the main menu will appear. Post-Update
: It is highly recommended to "Restore Defaults" and "Store Settings" (Save to EEPROM) in the printer's configuration menu to ensure no old settings conflict with the new firmware. Additional resources for Sunlu T3 users Official Support Community Firmware Calibration Downloads & Documentation Sunlu Official Facebook Support
provides direct links to their official firmware repository for T3 32-bit boards. For the standard manual and slicing software setup, visit Scribd's hosted User Manual for detailed operation steps. Custom & Marlin Builds denizkoekden's GitHub
hosts an archive of the official source code for those who want to compile their own Marlin 2.0 version.
A popular pre-compiled version with 5x5 Bed Leveling and higher temp support is available on Printables by Kaot93 Setup & Optimization Anson Liu's technical blog
details the controller board electronics and why certain firmware fixes are necessary for the cooling fans. Are you updating to fix a specific bug
, such as the extruder cooling fan issue, or are you looking to install a for bed leveling? AI responses may include mistakes. Learn more
This report outlines the procedures, benefits, and risks associated with updating the firmware on the
(Terminator) 3D printer. The Sunlu T3 is equipped with a 32-bit motherboard, typically a modified version of the BigTreeTech SKR Mini E3 V2 Update Overview
Updating firmware on the Sunlu T3 can improve performance, fix factory bugs, and unlock features like increased hotend temperatures or optimized bed leveling. Official Version v3.40 (released Oct 2022) Firmware Type Marlin 2.0 Primary Method microSD Card (Auto-update on boot) Key Hardware STM32F103 MCU (32-bit) Preparation & Requirements Before beginning, ensure you have the following: MicroSD Card: Must be formatted to with a small allocation size (e.g., 4096 bytes). Firmware File: file named exactly firmware.bin for official/custom Marlin, or specifically configured for Official Downloads: Available via the Sunlu Support Page (v3.40 is the latest stable official release). Update Procedure (SD Card Method) Obtain the correct file for your specific machine version. Ensure the microSD card is clean and formatted to FAT32. Copy the file to the root of the SD card and rename it to firmware.bin Turn off the printer. Insert the SD card into the printer's slot.
Turn on the printer. The screen may remain blank for 10–30 seconds while the update installs.
Once the UI loads, check the "About Printer" or "Info" menu to confirm the new version number. Critical Considerations & Known Issues klipper/config/printer-sunlu-t3-2022.cfg at master - GitHub
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
Sunlu T3 Firmware Update: A Comprehensive Guide
The Sunlu T3 is a popular 3D printer known for its high-quality prints, ease of use, and affordability. Like any other electronic device, the Sunlu T3 requires periodic firmware updates to ensure optimal performance, fix bugs, and add new features. In this write-up, we will guide you through the process of updating the firmware on your Sunlu T3 3D printer.
Why Update the Firmware?
Updating the firmware on your Sunlu T3 3D printer is essential to:
Preparation
Before updating the firmware on your Sunlu T3, make sure you:
Downloading the Firmware Update
To download the firmware update for your Sunlu T3:
.bin or .hex.Updating the Firmware
To update the firmware on your Sunlu T3:
Using the Sunlu Firmware Update Tool
If you are using the Sunlu-provided firmware update tool:
Using Arduino IDE
If you are using Arduino IDE:
Post-Update Checklist
After updating the firmware:
Troubleshooting
If you encounter any issues during the firmware update process:
Updating the firmware on a is a straightforward process because the printer's board (an Ender 3 clone
using a modified SKR Mini E3 V2) supports flashing directly via the Micro SD card slot. Preparation Requirements Micro SD Card : Use a blank card (8GB or smaller is recommended). : The card be formatted to with an MBR partition map. Firmware File : A compiled file. You can find official versions on the Sunlu Website or custom Marlin builds from community members like Kaot93 on Printables Step-by-Step Update Guide Prepare the Firmware File Download your chosen firmware file. Rename the file to 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.
Insert the Micro SD card into the printer's slot (contacts facing for the T3). the printer. Wait for Completion The screen will remain blank for approximately 10–20 seconds while the board installs the new software. Once finished, the main interface will load automatically. Post-Update Reset Navigate to Configuration Restore Defaults
(or "Initialize EEPROM") to ensure no old settings interfere with the new firmware. Save Settings to confirm the reset. Important Notes USB Warning To update the firmware on your Sunlu Terminator
: Some custom firmware builds (like the popular Kaot93 version) may disable USB functionality. Check the specific file of your chosen firmware before flashing. : After updating, you will likely need to re-calibrate your and run an Auto Bed Leveling (ABL) sequence, as these values are often wiped during the reset. Printables.com specific firmware version for a feature like BL-Touch or high-speed printing? Custom Firmware for SUNLU T3 by Kaot93 - Printables.com
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
Sunlu T3 (Terminator 3) firmware "draft feature" typically refers to the Fast Mode (or F/N Mode), a core selling point that enables print speeds up to 250mm/s. Key Feature: Fast Mode (F/N)
This feature allows for rapid prototyping by overriding standard G-code settings directly through the printer's interface.
Functionality: It can be toggled in the printer's menu during a print. It works by significantly increasing acceleration and jerk settings.
Drawbacks: Users often report a sharp decline in print quality, including misaligned layers, holes, and visible "ringing" or ghosting.
Optimization Tip: To maintain better quality while printing fast, it is often recommended to manually increase the nozzle temperature by approximately 10°C to ensure the filament melts quickly enough for the high-speed extrusion. Updating the Firmware
Updating to the latest version (such as v3.40 or newer) can help resolve bugs in related features like jam detection and power loss recovery. Custom Firmware for SUNLU T3 by Kaot93 - Printables.com
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 Fix bugs and issues : Firmware updates often
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
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
The Sunlu T3 (also known as the Terminator T3) is widely regarded as an Ender 3 clone that utilizes a 32-bit control board similar to the BTT SKR Mini E3 V2. Updating its firmware can resolve common issues like Z-axis "squashing," optimize "Fast Print" performance, and enable advanced features such as improved Automatic Bed Leveling (ABL). Where to Download Sunlu T3 Firmware
There are two primary paths for acquiring firmware: official releases from Sunlu and community-driven custom builds.
Official Sunlu Website: The latest official versions (e.g., v3.40 or higher) are typically hosted on the 3DSunlu download page.
Official Social Media: Sunlu occasionally shares direct firmware support links via their Official Facebook Page.
Custom Community Firmware: For users seeking more control, developers like Kaot93 on Printables provide builds with 5x5 point ABL, higher hotend temperature limits (up to 285°C), and PID tuning for both the bed and nozzle.
Open Source Repositories: You can find archived official source code and Marlin 2.0 bugfix branches for the T3 on GitHub. Step-by-Step Update Guide
The Sunlu T3 uses a simple microSD card flash method. No special software is required to push the update from a computer. sunlu 3d - Facebook
Even veterans run into issues. Here is how to fix the most common Sunlu T3 firmware update failures.
| Problem | Likely Cause | Solution |
| :--- | :--- | :--- |
| Screen stays blue/white | Wrong screen firmware or bad SD card | Reformat SD (4096 bytes). Re-download the DWIN_SET. Use a different brand of SD card (Sandisk works best). |
| Printer beeps continuously | Mainboard firmware name is wrong | Rename file exactly to firmware.bin. Ensure it is the correct file for your motherboard chip (STM32F103 vs F407). |
| Touch screen says "No printer attached" | Mainboard and screen firmware versions are mismatched | Flash the mainboard again. Then flash the screen. Version numbers must align (e.g., both v2.5.3). |
| Printer freezes on boot logo | Corrupted bootloader | You need to use an ST-Link programmer to force flash the bootloader (advanced). Or contact Sunlu support for a replacement motherboard. |
| Thermal Runaway error on first heat | PID values are wrong | Let the printer cool. Run the PID tuning command immediately. Do not try to print until PID is saved. |
.bin file. Rename it strictly to firmware.bin (all lowercase). If your board requires Robin_nano.bin, use that instead.firmware.bin in the root directory of the SD card. Do not put it inside a folder.firmware.bin file from your PC. If you leave it on the card, the printer will re-flash every time you reboot.V1.2.0).If you attempted a screen update that failed, the printer might be stuck on a logo screen. A fresh firmware flash is the only cure.
firmware.bin.firmware.CUR. If not, nothing changes.