I went slightly overboard but same as lexi I’m not tapping into original circuitry, just supply from the socket (so it’s really home wiring rather than printer wiring) and drive a relay (mechanical in my case rather than electronic) from the led connector. There is a lot less current draw from the relay (about 5mA) than the original led (about 150mA). Of course this only fits a P1, there is a board on the X1 where my meanwell 220V/5V sits. I wanted to make sure I would totally avoid drawing any current from my printer while still keeping the original functionnality of the led switching. My original USB 5V socket is only used to power my panda touch although I could have powered it from the meanwell 5V power supply but this way, current draw from both is well below the max output and everything stay cool.
