Nice subject line, Father Steve. You fooled me!

three-dimensional printers This, I understood the description of (somewhat, anyway: deposits on top of deposits, building up); but what I totally don't have an inkling of is: how deep do they get? How could a printer put out something, say, 6" or a foot deep? Say, a chair. Or perhaps they didn't mean a model you can hold in your hands--is it more like a bas-relief, maybe?
wseiber, did you know about this?

Edit: insel, I hadn't even thought about it in terms of manufacturers getting stuff back. Perhaps, if it becomes a reality, it'll be something like an ATM card: the tracking chip won't be activated until you put in your own identifier similar to a PIN. So maybe only you could track it...?