No question the technology is advancing almost as fast as prices are beginning to drop.
However these are not for the faint of heart. It's easy to make something from an existing plan. And if you buy a 3-D scanner then reproducing some things would be fairly easy.
The biggest hurdle to 3-D printing in the home is that I think the vast majorities do not have the design skills to create a plan. You need much more than a passing fancy of design programs. If they can solve that issue with technology then I think people will line up to buy them. Although the way kids are so technology adept these days they could probably handle creating something after a few trys.
Ed
