Differential infrared z probe

This is a remixed version of david crockers differential infrared z probe.
I uploaded the eagle source files, so you can change what ever you like.
I also added the gerber files as a zip file, which i sent to elecrow for manufacturing the pcb (they are super cheap, a buck for a pcb two sided. if you want to order this pcb from elecrow, please use my referral link: http://www.elecrow.com/referral-program/MTgxNjBqMnQ=/ )

I changed the smd ir diodes for regular ones, as you can get them dead