This is a simple, printable mounting system for FSR auto leveling (worse sensitive resistors). I've used these on Rostock Max, Kossel 250, Mini Kossel delta printers and also in a Taz 4 Cartesian printer. I highly recommend buying the FSR Kit from UltiBots - it comes with the JohnSL interface board, the wiring harnesses with preassembled connectors. They work perfectly with this mount.

UPDATE: I've added a second version that is designed for the Kossel 250 or similar printers. There are 2 mount parts, one is for a threaded insert, the other is plastic and can be threaded directly. This extra hole is for an M3 cap screw that fixes the Holddown part as shown in the attached photo.