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Kyocera: $0.004 per page (making the Xerox nearly 10 times as expensive!)

A Kyocera printer equivalent to the ones discussed here, the FS-820, runs at about $0.012 per page. So cheaper, but not wildly so. I'm sure that as the cost of the printer goes up, the cost of the toner goes down, regardless of manufacturer, if due only to the fact that you get more toner per cartridge, and the plastic cartridge probably costs more than all the toner in it.

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A big reason the Kyocera's CPP is so low is that they do not replace the drum/developer with toner change

I don't know what you've been reading, but no laser printer that I'm aware of replaces the drum at the same time as the toner. Given, high-quality printers use longer-lasting drums. The Xerox drum (or "imaging unit", as they put it) is rated for only 20,000 pages, for example. The replacement is $150. (I did not count this cost into my estimates above.) Kyocera doesn't list the cost for a replacement drum for the FS-820, which makes me think that they intend for it to be thrown out when it wears out.
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Bitt Faulk