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I just seen the replies in your intro thread, about the planet-cnc boards (zapp are selling the ready made planet-cnc stuff)
I've seen them mentioned, but can't think of seeing any build threads...

That or, if you fancy some soldering:
http://www.planet-cnc.com/

I would try parallel first and see how you get on. It doesn't have to cost you anything to try it and see.

I would quite like a...