I agree with you that 3D printer is not a consumer item like a microwave oven or a dish washer. At least not for few hundred years until we have molecular level

I agree with you that 3D printer is not a consumer item like a microwave oven or a dish washer. At least not for few hundred years until we have molecular level replicators like in the Star Trek. But it's going to be a great thing for creators and educators. But Definitely not a "consumer item".