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3d printed cars aren't all that far off. It's just the body, and probably will be for some time because processes for 3d printing metal aren't ready for prime time (and using a mill or lathe makes more sense for many parts anyway), but 3d printing a body and buying off the shelf parts for what can't be printed is close enough to downloading a car. I don't think printers large enough to do it are practical for home use just because they're so big, but it's not much of a stretch to imagine going to a service bureau to do it, like you would go to Kinkos/a printer if you needed large format prints.