Self-positioning induction trigger for WeldingRodBot

UPDATE: I uploaded a universal trigger that friction fits on the induction sensor barrel. It would work with any printer that has at least the lower half of the induction sensor barrel exposed. http://www.thingiverse.com/thing:1523184

This part here is designed to work only on WeldingRodBot (http://www.thingiverse.com/thing:981664), with an induction sensor mounted in the center hole of the carriage. I made this as a sort of Poor Man's BLTouch. This flexible part slides onto the bottom of the carriage, and positions a metal trigger beneath the induction sensor. This allows an almost** fully automated mesh bed leveling measurements. After the measurements, I slide the TPU part off of the carriage and can use the entire bed without any foil, clips, or any other metal triggers left in the way of the nozzle.

This part let me save some time and turn off the manual "trigger" behavior in Repetier Firmware -- I was previously manually positioning the razor blade on the glass for ea