LJC18A3-B-Z/BY is the sensor we use. The connection is the same as for the inductive sensor we propose for K8200. Check here: We put the support material for friendly printing of the model. It is easy removable with a knife. You can easily attach the holder to your cold end carriage by enlarging the bolts and putting the second nut to each one. don't forget to put washers. We also attached the .ipt file in case you want to upgrade something. We recommend to print the model with the sensor hole attached to bed, so that you get perfect cylinder for the sensor. And the support material will help to close the bridge. Feel free to post your makes and remixes!