Updates can refine the extruder cooling fan behavior, ensuring it stays on whenever the hotend is heated—not just when motors are moving.

: The latest official versions (e.g., v3.40 or higher) are typically hosted on the 3DSunlu download page.

hosts an archive of the official source code for those who want to compile their own Marlin 2.0 version.

If your T3 is working perfectly and you don’t have a specific bug, a firmware update is optional. However, if you’re adding hardware or experiencing crashes, updating is a good first step. Always verify your board revision first.

Sunlu T3 Firmware Update < No Sign-up >

Updates can refine the extruder cooling fan behavior, ensuring it stays on whenever the hotend is heated—not just when motors are moving.

: The latest official versions (e.g., v3.40 or higher) are typically hosted on the 3DSunlu download page. Sunlu T3 Firmware Update

hosts an archive of the official source code for those who want to compile their own Marlin 2.0 version. Updates can refine the extruder cooling fan behavior,