LJ12A3-4-Z/BX Proximity Sensor 12mm/4mm

Inductive proximity sensor widely used in 3D printers for bed levelling or just as an alternative endstop. It is a great way to get rid of manually levelling the bed and the nozzle clearance. There is an option in Marlin that you need to enable and everything else is automatic. Once you use it, you will never want to go back. Easily connects to RAMPS or other motherboard.