"While the initial scan is a perfect atomic level recording of the baseline human, our printing technology is limited by the tolerances achievable in the print heads. It only takes a few atoms to swap places and you create small corruptions that escalate with every rescan. Cancers, viruses, autism, a whole collection of ways to die. If you’re scanned at sixteen, live another fifty years, then are rescanned the new model with not survive more than a few hours free of the machines. That is why you can only be reprinted from that initial recording; all subsequent memories and experiences are lost. Alternatively, live your life and get scanned at seventy and the same applies, you’ll forever be in that aged-out physique. Picking the right time to scan is a balancing act."