Off topic: small DIY CNC mug printers

This type of DIY machines have some similarities and shared technologies with 3d printers. You can make them yourself as they are almost same in complexity as a 3d printer.
I see possibility to upgrade the technology to draw on various tubular shapes (like pipes), combine them with 3d printers to add decoration or replace the painting top with mill or laser cutter.
This segment of small DIY CNC devices will certanly expand in the future ...

The Mug Maker

http://www.evilmadscientist.com/2013/mug-marker/

Mug Plotter

Complete and detailed building instructions fro Mug Plotter:

http://www.instructables.com/id/Mug-Plotter/?ALLSTEPS