As documented by users, the V3.40 firmware had a few quirks that were important to know:

Because the Sunlu T3 architecture closely mirrors the Creality Ender 3 Neo series, many users compile custom Marlin firmware using VS Code and Auto Marlin Builder. Key Compiling Edits

After updating, your printer’s brain has changed, but its memory (EEPROM) needs to be updated too.

: Guidance on enabling PID bed tuning , which Sunlu strangely disabled in the factory version [19]. 🛠 Popular Firmware Options

Opens the door for Linear Advance to clean up sharp corners.

Invert the endstop logic. Open your firmware Configuration.h and look for X_MIN_ENDSTOP_INVERTING . Set it to false if it is true (or vice versa). You may need to recompile.

: Enables PID tuning for the heated bed, resulting in more stable temperatures and less warping. How to Compile Marlin for Sunlu T3:

Resolve issues with thermal runaway protection or leveling inconsistencies. Hardware Upgrades:

enabled. This is a critical safety feature that shuts the printer down if it detects the heater is out of control, preventing potential fires.

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 main chip configuration (commonly an or GD32 micro-controller).

Create a printer.cfg file on your Raspberry Pi. You can often find community-made Sunlu T3 configuration files on GitHub. Ensure your pin assignments for the stepper motors, heaters, and the clog detection sensor match your specific board version. Troubleshooting Common Firmware Issues 1. The Screen Stays Blank and Nothing Happens

Download and install the PlatformIO and Marlin Auto Build extensions.

If your printer is glitching or you just want a clean slate on the factory operating system, flashing the official firmware is straightforward. Step-by-Step Installation:

: Once the main menu appears, check the "About Printer" section in the menu to confirm the new version is active.

Stock auto-bed leveling routines can be inconsistent. Upgraded firmware offers mesh editing and smarter probing paths. Sunlu T3 Motherboard Architecture

To help give you the exact steps or code blocks for your printer upgrade, could you let me know: