#Two printers on one pi (MCU issue)
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You might want to put the serial ports of your two printers there? One serial port into the first one, like you already did and the serial port of the second printer into the second one.
To get your serial ports, have a look in the documentation: https://www.klipper3d.org/FAQ.html#wheres-my-serial-port
both of them are this /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0
So ls /dev/serial/by-id/ give you two times the same output?