Today, I added end-stops and finished all the ends of my wire with sockets.
The end-stop design came from thingiverse, but I drew a new version to hold a 10mm rod (below). Also, preparing wires to go into sockets is hard. If I were to do this again.... I think I would make a machine that doesn't require any wiring... AH HA just kidding, I am getting better at it slowly.