When you watch a demo of it printing there is awful amount of x wobble, however, I don't know how much it hurts the final output accuracy. It would help to secure the top rods in a triangular fashion like the Reprap.
Put it on github so people can send you improvements/amendments?
Actually, scratch that now that I see you created parts in Google sketchup. Accessible, yes; able to accept simple code changes, no.
