FES V1.0 Filament Fault Detection Switch for 1.75mm Filament is also known as filament detection sensor. It is used to detect ABS, PLA or any other filament continuity before feeding to the printer extruder. When the filament crosses the module and press the slide, enter the high level and the lights are off.

When there is no filament, the switch will hit, then enter a low level and the light is on, the buzzer sounds to give you advice. In such a situation, add the filament and it will remain printed.

Wiring: 

• Red: Vcc
  
• Black: GND ground
• White: Signal