Prusa I3 Pro B Pen Plotter Holder

This is a pen holder for the Prusa I3 Pro B (or at least for the MK8 extruder base) to make the printer a plotter (or draw with a pen on stuff). You will need to drill the holes through the M3 nut cavity (I made it this way so that the top round hole can be printed straight).
https://www.youtube.com/watch?v=4ZxLFf6x2JM