None of them can hit the tolerances. The only place I could see it being workable would be printing out track for a large lego layout, because the track parts are expensive and fairly limited (the curve radii is great for a kids playset, not so great for a real model), but don't need to integrate so tightly with the rest of the system. Don't say use the Lego flextrack, I've got that and find it a huge disappointment. It is useful as an official 1/2 length straight, and not much else.
PS: This is news for nerds. +1 for the new overlords.