Remake for making fit the LJ12A3-4-Z/BX Inductive Proximity Sensor Switch NPN. We decide to use this one because we are using an Aluminium printing Bed. The model with the embedded nut - the support material is easily removed with a knife. to see working : http://youtu.be/9LUilpISe4M for info about determinate the probe offsets: https://www.youtube.com/watch?v=EcGFLwj0pnA Feel free to post your makes and remixes!