I can't wait for 3D printers to be heavily regulated when guns aren't. It's even better than the gun emoji saga.
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Ideal scanner is just a fixed-focus camera mounted appropriately below glass bed with uniform light source. The slow stuff with moving parts is just a legacy design from a backwards industry.
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Printer is the more interesting problem for open hardware since it necessitates moving parts with precision controls.
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I have to ask this, is it hostile to the user to prevent counterfeiting? It keeps the value of money going.
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It's probably beneficial to someone dumb enough to try to pass off photocopies on plain paper as currency to be stopped before they get to the point of doing it and get caught. But printer firm-mal-ware does a lot more like embedding tracking watermarks.
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I'm also not clear what happens if your image contains only parts of currency, or currency at a different scale, which might be printed without breaking any local laws in art of in training manuals on distinguishing real vs counterfeit currency.
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