Taiss 2PCS LJ12A3-4-Z/BX Proximity Switch 3D Printer Inductive Proximity Sensor Detection Switch NPN NO DC6-36V 4mm Normally Open

These worked just fine as an early detection device for a slipping gearbox mount. You just have to connect them correctly. I purchased NPN proximity sensors which are not wired the same as PNP. If connecting to a relay PNP should be wired with the black wire in A1 and A2 going to ground, or reverse for NPN; black wire to A2 and A1 going to positive.

Using as homing sensors for my CNC machine. They are the same sensors as the Longmill CNC machine.

Trianing

Perfect replacement for Tina 3D printer.

Sensor is labeled incorrectly and is not NO. Does not work as its not NO but instead NC. Z axis will not run unless the sensor is triggered and wont stop unless sensor is cleared. Not really surprised as these are bottom of the barrel from china. I have an use for them elsewhere. Buyer beware and understand how these are supposed to work.

Works as expected. Gives me ~1mm tolerances

In my set up it detects a rotating metal.piece in a container 12mm away, spinning at 8000 rpm.