I am wondering if it is possible to print with a 3D printer from an SD card and connect to a serial host at the same time. I want to use the Marlin
M118 serial print command to trigger custom functions running on a Raspberry Pi. The RPi would be connected to the printer over serial but would not be sending G-code. Is this possible?
My printer is the Monoprice Mini Delta. It runs a Marlin based firmware and I can install standard Marlin on it if necessary.