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A common filament runout sensor design sold online has 3 pins but their functions are not always labeled. The sensor has a 3 pin JST-XH 2.5mm header that you would normally connect to an identical 3 pin port on your printer controller board. It’s plug and play if your controller board was designed to accomodate filament runout sensors with the same 3 pin header. The Ultimaker Ultimainboard controller board used in the Original+ and 2/2+ does not have a labeled 3 pin JST-XH header for filament ...