Sunlu T3 Firmware

Sunlu does not maintain a public GitHub repository. Official firmware is distributed via:

⚠️ Warning: Never download T3 firmware from unverified third-party sites – corrupted firmware has been known to brick the touchscreen.

Because Sunlu’s official updates are sparse, the community has built:

Use these at your own risk – you will lose touchscreen support unless you port the DGUS LCD.

If you’d like, I can:

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(Terminator 3) runs on a variant of Marlin firmware , specifically designed for its 32-bit controller board, which is a clone of the BigTreeTech SKR Mini E3 V2 Official Firmware Options Manufacturer Source : The latest official firmware (e.g., version ) can be downloaded from the Sunlu official site Official Archive

: A copy of the official firmware and source code is archived on GitHub by denizkoekden for users who want to fork or modify it. Community & Custom Firmware

Because the stock firmware's "Fast Print" mode is somewhat opaque, many users opt for custom builds to unlock better control or fix specific bugs. Kaot93’s Custom Firmware : Available on Printables.com , this build enables features like 5x5 Automatic Bed Leveling (ABL) sunlu t3 firmware

, BLTouch assisted bed tramming, and higher hotend temperature limits. Marlin 2.1.x Bugfix

: Anson Liu provides configurations for the latest Marlin bugfix branches, fixing issues like the extruder cooling fan pin mapping

which, in the stock firmware, only turned on when motors were active rather than based on hotend temperature.

: For those seeking maximum speed and advanced features like Input Shaping, a Klipper configuration

is available on GitHub. This requires a separate host like a Raspberry Pi. How to Update Your Firmware Prepare the SD Card : Format a microSD card to FAT32. firmware.bin file from a trusted source like the official Sunlu site Printables : Copy the file to the root directory of the SD card.

: Power off the printer, insert the card, and power it back on. The screen may stay blank for several seconds while it flashes.

: Check the "About Printer" menu to confirm the version has changed. Are you looking to enable a specific feature (like a BLTouch) or just trying to with the current stock version? Custom Firmware for SUNLU T3 by Kaot93 - Printables.com

Upgrading the firmware on your SUNLU T3 (Terminator 3) is one of the most effective ways to unlock higher print speeds, improve bed leveling accuracy, and resolve common bugs. Whether you are looking for the official stock version or a high-performance custom build, this guide covers everything you need to know about Why Update Your Sunlu does not maintain a public GitHub repository

is a capable "Ender 3 clone" out of the box, the stock firmware often limits the hardware's potential. Updating can provide:

Improved Thermal Safety: Fixes issues where cooling fans might not activate properly during heating.

Advanced Bed Leveling: Custom firmware often expands the auto-leveling mesh (e.g., from 4x4 to 5x5) for better first-layer adhesion.

Faster Print Speeds: Unlocks the printer's advertised 250 mm/s potential through better acceleration management.

Additional Features: Adds "babystepping" for fine-tuning the Z-offset during a print and enables PID tuning menus for the bed and hotend. Official vs. Custom Firmware

Depending on your technical comfort level, you have three main options: 1. Official SUNLU T3 Firmware

Best for users who want to keep the machine in its factory state. SUNLU provides the official 32-bit firmware on their official support site. Pros: Stable, factory-tested, includes "Fast Print" mode. Cons: Limited customization and slower bug fixes. 2. Custom Marlin Builds (Recommended)

Community-developed Marlin configurations, like those by Kaot93 on Printables or configurations found on GitHub, are highly popular. ⚠️ Warning: Never download T3 firmware from unverified

Key Features: Higher hotend temperature limits (up to 285°C for all-metal hotends), jam detection, and manual bed tramming assistance. 3. Klipper Firmware

For power users, Klipper moves the heavy processing to a separate device like a Raspberry Pi. What is the difference between Marlin and Klipper firmware?

The Sunlu T3 (also known as the Terminator 3) is a high-speed FDM printer marketed for its ability to reach speeds of up to 250mm/s. While its hardware—a dual-gear extruder and 32-bit silent mainboard—supports this, the firmware is the true engine behind these capabilities.

Whether you are looking to restore the official factory settings or push the machine's limits with custom builds, this guide covers everything you need to know about Sunlu T3 firmware. 1. Official Sunlu T3 Firmware

The stock firmware is a specialized version of Marlin 2.0. Its standout feature is the "Fast Print" mode, an algorithm that optimizes acceleration and speed values directly from the printer's interface to cut printing times by up to 50%. Core Features:

16-Point Auto Bed Leveling (ABL): Uses an inductive sensor to compensate for bed irregularities.

Clog Detection: Automatically pauses prints if the filament stops moving, a rare feature in this price bracket.

Silent Stepper Support: Configured for TMC2209 drivers to maintain quiet operation (approx. 45 dB).

Where to Download: The official firmware.bin files are hosted on the Sunlu Support Page and archived by community members on GitHub. 2. Custom Firmware Options: Marlin vs. Klipper sunlu 3d - Facebook

Note: The Sunlu T3 is largely a rebranded/rehoused version of the Artillery Hornet or a similar low-cost Cartesian printer. Its firmware is a customized version of Marlin 2.0 (usually 2.0.x or later).