I thought some of you might like to see this. It is called a "Mostly Printed CNC" because all the plastic parts are 3D printed. The files needed to print the parts are FREE!
http://www.thingiverse.com/thing:724999 The metal rails are plain cheap 3/4" emt conduit. The electronics can all be bought inexpensively online if you can configure them yourself or for a little extra from the machine's designer. I bought most of my electronics and tool bits from him to support his development efforts.
Here is a video of mine:
