Sunlu T3 Firmware Today

You must compile Klipper firmware for your specific T3 MCU (usually STM32F103 ). You will permanently lose the stock LCD screen UI unless you install KlipperScreen on a touch display. This is for tinkerers only.

: With the printer off, insert the card. Turn the printer on. The screen will remain blank for 10–20 seconds while it updates. sunlu t3 firmware

| Symptom | Likely Cause | Solution | |---------|--------------|----------| | Homing fails, probe does not deploy | Wrong probe type in firmware | Recompile with Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN disabled | | Touchscreen shows no response | Firmware mismatch between mainboard and screen | Flash both mainboard and DWIN firmware | | "TMC CONNECTION ERROR" | UART pins not configured | Update to post-2023 firmware, or manually define in Configuration_adv.h | | Thermal runaway after 10 min | PID values incorrect | Run M303 E0 C8 S210 U1 , then M500 | | Extruder steps/mm wrong (default 140?) | Old firmware used 400 steps | Set M92 E140 (for T3’s standard extruder gear ratio) | You must compile Klipper firmware for your specific

If you are nervous about compiling code, stick to the official T3_V1.0.4.bin from Sunlu support. If you want to turn your budget T3 into a high-speed, high-quality machine, learn to compile Marlin 2.1.x or switch to Klipper. : With the printer off, insert the card

Updating the Sunlu T3 firmware is a relatively straightforward process: