Before diving into the "how," we must address the "why." If your printer is working perfectly, you might be tempted to skip updates. However, there are several compelling reasons to keep your firmware current.
Modern firmware unlock capabilities like "Linear Advance" (for sharper corners), "Junction Deviation" (for smoother movement), or improved "Babystepping" controls. A firmware update might transform your T3 from a standard printer into a precision machine.
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. Sunlu T3 Firmware Update
There are two main hardware versions of the Sunlu T3. Using the wrong firmware will brick your printer.
How to check: Open the electronics case under the printer and read the text on the main board. Alternatively, contact Sunlu support with your serial number. Before diving into the "how," we must address the "why
Final tip: 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.
Navigate the T3 menu:
Menu > Info > About Machine > Firmware Version There are two main hardware versions of the Sunlu T3
Write this down. You will need it to confirm the update succeeded.
This guide covers why, when, and how to update the Sunlu T3 (and closely related Sunlu models) firmware safely, how to prepare, step‑by‑step instructions for common update methods, troubleshooting, and rollback/verification tips.
If your T3 has an auto-leveler:
M851 Z-1.85 (Example offset; use the paper test to find your true value).
M500