Here’s a structured, solid article on updating the Sunlu T3 firmware. You can use this directly on a blog, wiki, or forum.
Before updating, you need to know what version you are currently running to see if an update is necessary.
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.
After your Sunlu T3 firmware update, do not just start a 12-hour print. Verify these five things:
M500)?Navigate the T3 menu:
Menu > Info > About Machine > Firmware Version Sunlu T3 Firmware Update
Write this down. You will need it to confirm the update succeeded.
Updating the Sunlu T3’s firmware is straightforward if you follow the steps above. While the printer works well out of the box, a modern firmware can iron out small annoyances and occasionally add useful features like M600 filament change or better mesh bed leveling.
If you’re not experiencing any issues, you don’t need to update. But if you’re chasing better print quality or fixing a specific bug, go for it – just proceed patiently.
Have a successful update story or a problem not listed? Let us know in the comments. Here’s a structured, solid article on updating the
Updating the firmware on a is a straightforward process because the printer's board (an Ender 3 clone
using a modified SKR Mini E3 V2) supports flashing directly via the Micro SD card slot. Preparation Requirements Micro SD Card : Use a blank card (8GB or smaller is recommended). : The card be formatted to with an MBR partition map. Firmware File : A compiled file. You can find official versions on the Sunlu Website or custom Marlin builds from community members like Kaot93 on Printables Step-by-Step Update Guide Prepare the Firmware File Download your chosen firmware file. Rename the file to firmware.bin
exactly. If you have updated before, ensure the name is different from the previous update (e.g., firmware_v2.bin ) as the board may ignore a filename it has already "seen". Copy to SD Card file in the root directory (not inside any folders) of your formatted Micro SD card. Flash the Printer the printer. Unplug any USB cables connected to the printer.
Insert the Micro SD card into the printer's slot (contacts facing for the T3). the printer. Wait for Completion The screen will remain blank for approximately 10–20 seconds while the board installs the new software. Once finished, the main interface will load automatically. Post-Update Reset Navigate to Configuration Restore Defaults Turn on the printer
(or "Initialize EEPROM") to ensure no old settings interfere with the new firmware. Save Settings to confirm the reset. Important Notes USB Warning
: Some custom firmware builds (like the popular Kaot93 version) may disable USB functionality. Check the specific file of your chosen firmware before flashing. : After updating, you will likely need to re-calibrate your and run an Auto Bed Leveling (ABL) sequence, as these values are often wiped during the reset. Printables.com specific firmware version for a feature like BL-Touch or high-speed printing? Custom Firmware for SUNLU T3 by Kaot93 - Printables.com
Since Sunlu does not use a standard "download center" for end-users and the T3 is a rebadged version of a popular printer, here is the complete guide to finding and installing the firmware for the Sunlu T3.