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I want to connect an Arduino or similar MCU board to an Ender 3 mainboard and make them communicate. I don't want to use USB. Are there any pins on the controller boards to achieve this?

I found in the Marlin G-code reference the M118 (serial print) command, this is ideal for my need, but I don't know to catch its serial messages on the mainboard.

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You can solder cables to the RX, TX and GND pins on the mainboard.

There are tutorials on Youtube that describe this.

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