Ender 3 Pro Firmware update Help Please! : r/ender3
Corrected) Bootloader wiring diagram for Arduino nano : r/ender3
It's alive! Ender 3 Pro capable of 5-color print. 3-in-1 out hot end with 2 Y-merger piece. Stock board plus Arduino Uno+CNC shield all driven by Klipper on a Raspberry Pie 3B+. :