I think too many get hung up on the novelty value of 3-D printing. Materials are limited, strength is low, and tolerances are wide. Sure it's infant technology. The materials will always be limited, you'll never be able to print a spring of tempered high carbon steel for instance. When it becomes useful "young adult" technology I might be interested, but right now it's still in the gimmick stage and not suitable for anything requiring precision and/or high strength.