akkarin writes in about a study reported at Ars Technica on how accurate ink-jet printers are when they report that cartridges are empty. Not very, it turns out. Epson came out on top of the study (and Ars rightly questions how objective it was, given that Epson paid for it), but even they waste 20% of the ink if users take the printers' word for when to get a new cartridge. On average, the printers in the study wasted more than half the ink that users bought.
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