CNC Arduino wood router made from old dell printer

This is a follow up to this video:
https://www.youtube.com/watch?v=Juvt0CN8wYc&feature=youtu.be

Here I had completed the Z axis so that I could raise and lower the pen. And, not only a pen, but then I have a high speed router motor holding the pen. Later I put a bit in this router and cut a sign for my workshop. Here's the original article:

http://www.dansworkshop.com/2015/04/dell-printer-cnc/

This CNC machine is made from an old Dell all-in-one printer. Not much is left of it but a thin metal frame. I keep upgrading parts too, soon it will have nothing but a few sensors left from the original.