If you're thinking about adding the autobed levelling feature to your 3D Printer, you're going to need a probe which can accurately measure the distance to the print bed at various test points.

One such probe is the inductive proximity sensor.

A look at the electrical characteristics of NPN/PNP inductive sensors from Banggood.

PNP Inductive Proximity Sensor:
►http://www.banggood.com/LJ12A34ZBY...

Dupont connector kit:
►http://www.banggood.com/310Pcs2_54mm...

Buy cheap 3D Printer kits and parts from Banggood here:
►http://goo.gl/bFyz5H

Amazon 3D Printers and Parts (Affiliate Link):
►http://amzn.to/2qdTebt

Download the HyperCube 3D Printer from Thingiverse:
►http://www.thingiverse.com/thing:1752766