If the printer acts strange after a flash, it is often due to the EEPROM not being reset. Run an "Initialize EEPROM" or "Reset to Factory Defaults" from the menu.
Since Sunlu does not always maintain an actively updated Marlin branch, the community relies on configuring standard Marlin releases. You can compile this yourself using with the PlatformIO extension. Key Marlin Configurations for Sunlu T3:
The of your upgrade (e.g., installing Klipper, adding a leveling sensor, fixing a bug)
If you are looking for more than just bug fixes, the community has developed superior custom firmware for the SUNLU T3, notably by users like Kaot93. Features of Custom T3 Firmware Enhanced BL Touch assisted bed tramming. sunlu t3 firmware
Move that .bin file to an SD card, insert it into the T3, and power it on to flash the printer's board.
Marlin runs entirely on the printer's internal 32-bit motherboard. Upgrading to a clean, community-compiled version of Marlin gives you access to the latest bug fixes, custom menus, and calibration tools without needing extra hardware. 2. Klipper Firmware
If your X, Y, or Z axis moves the wrong way after a Marlin flash, you must invert the stepper direction settings in your configuration file and recompile, or switch the wire polarity. Conclusion If the printer acts strange after a flash,
Optimized firmware better utilizes the TMC2209 silent stepper drivers on the Sunlu board, reducing motor noise. Understanding Your Options: Marlin vs. Klipper
After flashing, you must calibrate your printer to ensure the new firmware settings are applied correctly. 1. Set Z-Offset
The Sunlu T3 is a workhorse, but it ships with a lethargic operating system. By upgrading from the stock firmware to a community build (or rolling your own), you unlock the printer's true potential. You can compile this yourself using with the
The Ultimate Sunlu T3 Firmware Guide: Upgrades, Flashing, and Klipper
Copy the downloaded .bin file directly to the root directory of the SD card. Do not put it in a folder.
(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
Fine-tune stepper motor currents and chop modes if your board supports it, leading to quieter operation.
