Lego Factory -- my idea realized

A long time ago I had an idea about creating a 3d tool that would let you create any lego model you wanted - and then have some way to order the pieces for that model + print out the step by step directions. It looks like folks at Lego had a similar idea with Lego factory.

You know what would be a very cool next step? a Lego 3D printer! Send your favorite models to your friends and let the "3d printer" create it right there.