CNC Plotter with Arduino + GRBL now with Z axis

Here's my CNC plotter, from these videos:
https://www.youtube.com/watch?t=51&v=Juvt0CN8wYc
https://www.youtube.com/watch?v=TaNVAQuvBaY

But now, the plotter has been beefed up to perform wood routing. I had a lot of trouble with EMI botching up the USB connection and had to restart it a few times, but it worked quite well and the video is at 1x speed.

Here's the original pen plotter article:
http://www.dansworkshop.com/2015/04/dell-printer-cnc/

Some people might ask about the breadboard being temporary and unreliable. That's not the case at all. I have many projects that still work beautifully that are built on breadboards many years ago.