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 o