@chris-annin I'm getting +3.3v on all of the limits switch pins on the teensy (26-31). Made/not made does not cause a change. Vin on the teensy is +5...

Hi Chris, Bingo! Setting it back to 100% fixed it. Thank you!

I posted something similar a couple years ago. It was fairly easy to add to my AR3 and modify the AR software to control it..

Hello. I like this approach. What rack did you use?