If this is a silly question I apologize but I am trying to establish a serial connection between a 3D printer (Ender 3) and an Arduino Nano over the USB port.
I am able to connect the 3D printer to a serial monitor on my PC and send G-code to it and control the printer. I am also able to connect my Arduino to the serial monitor and also send and receive strings.
When I connect the Arduino directly to the 3D printer using a USB cable and separately powering the Arduino the 3D printer does not seem to respond to the G-code being sent over serial.
What am I missing?