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Reducing the number of automobile-related fatalities is a good thing, right? Well, maybe not if you're on the waiting list for, say, a liver transplant. And that's why the advent of Google-style driverless cars, which remove human error from the driving equation, will spur the advent of bioprinted organs. At least, that's how Bre Pettis, founder and CEO of Makerbot, sees it.