Taiss/ 2Pcs M18 Proximity Sensor NPN NO（Normally Open） 6-36VDC 8mm Detective Approach Sensor Inductive Proximity Switch LJ18A3-8-Z/BX

Works well interfacing with an Arduino. No debouncing necessary either. I've purchased many of these in both 24 volt and 5 volt and they all work perfectly.

These work as expected, proper wiring is required. Blue wire to Ground ( - ), Brown wire to VCC ( + ), Black wire to load. For NPN sensor connect load between VCC ( + ) and Black wire. Simple. Anyway they provided the diagrams.

You need to know how to wire up a proximity sensor. The three wire one makes it easy as you don't have to do it in-line. Watch some videos as to how it is done. I'm able to detect copper and brass pretty easily within the specs of the part.

While the sensor ordered was as described, I was not able to get either of them to work. I have other inductive sensors that trigger properly with exactly the same connections and same 3d printer setup. The probe shows the trigger indication ( LED turns on ), however the signal shows always triggered. I tried to standard and inverted ( I1) Z Probe setup, but could not get a proper signal.

I havent been able to get them to work.