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Imagine in the early days of the printing press if someone came along and said 'typesetting is cool, but I see the day when machines will be putting tiny dots on paper to make letters and pictures and whatever else you want'. A printer might say 'that's crazy, that will so expensive. You're talking science fiction.'
The day will come when printers can place atoms exactly and you can print an atomically perfect sword. Cheaper, faster, and easier than 20s era technology.