This is a printable &/or CNC Robot Kit. It's easy to make and so cheap.
At my blog there are links to all the parts and also some instructions. All is less than 40 €.
Blog link is here in Spanish -> http://www.3drc.es/watson-un-robot-imprimible-por-menos-de-40-e/
and here linked with google translator. It's easy to understand -> https://translate.google.es/translate?hl=es&sl=es&tl=en&u=http%3A%2F%2Fwww.3drc.es%2Fwatson-un-robot-imprimible-por-menos-de-40-e%2F
The bottom and top parts could be printed or CNCed. Best is lasercut 3mm acrylic.
Arduino code is included at files.
Feel free to ask if you need more info.
Hope you like!
UPDATE 01 April 2015
3dprint.com made an article about Watson. Very interesting -> http://3dprint.com/54738/affordable-3d-printed-robot/
I uploaded the battery support and the STL for closing the USB access hole (soporte_bateria.STL and tapa_hueco.STL)
I have made another upgrade, it's for users who doesn't have a printer bigger than 20x20cms (like Prusa i3). Some of them asked me to change the design. I have uploaded 5 STL files in order to avoid this problem. You can now also download the 2 chasis splitted in two parts and also a link part. For the bottom chasis the files are chasis01half?.STL, where ? is a (left) or b (right). The same is for chasis_tophalf?.STL. To link both parts you need to print 4x chasis_half_link.STL. You'll need also 16 M3 Screws.