The printer is switched off - the plug can even be out. The USB goes to the Pi for OctoPi, and that's on permanently.
And you wonder that nothing works?
No, I wonder why the screen stays on when the printer is like that. There is current coming from the USB port, but perhaps this video will make things clearer for you https://www.dropbox.com/scl/fi/x9xv8lc9xmq6l929dadwg/20250608-115304.mp4?rlkey=meen598x2u7dbxdpbsbgz6y7e&dl=0
You may look here: Put tape on the 5V pin - Why and how and here: Printers known to have backpowering issues
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Excellent! Thank you. My first attempt didn't work because I tried standard brown tape, which wasn't thick enough to block the voltage. My second go was with a "power" tape, much thicker and successful. I powered on the machine, and the Pi connected. I controlled the bed and head temps from the Pi and since I didn't want to try printing anything, turned off the printer. No flashing head light, no flashing screen
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