While the technology is coming and I can't wait when they're commonplace, I think it says something when the models shown next to printers aren't practical objects. Many people like these trinkets, but I'm waiting to see stuff which is more useful. This means right now the cost of a 3d printer is only really justified if you have an interest in them. They still need to prove their function before they become something like cars, where even those who have little interest and knowledge in them use them because they provide so much value.