The two parts of the pen holder construction of my simple Mini CNC Plotter. Some readers asked, so I made the available here.

The base part is glued to the vertical DVD drive and has two mounts for the metal rod which leads the slider that holds the pen holder (glued, too). This mechanism can be lifted and lowered very easy by a servo horn on the right place (see first video).

Project videos: https://www.youtube.com/watch?v=s_W0cPu5Gqs https://www.youtube.com/watch?v=tFOMlugRKnM

Project blog article (in german only, sorry):
http://www.makerblog.at/2015/02/projekt-mini-cnc-plotter-aus-alten-cddvd-laufwerken/