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I really find this unethical. The Canon toner cartridges that you are supposed to buy with this work with the printer so that when they are (supposedly) low on ink, the printer starts blinking an error message. It lets you use it for a few dozen more print jobs. Then, despite the fact that there is NO sign of lack of ink, and the fact that FAXING DOESN'T REQUIRE INK, the printer stops working and so does the fax function. I struggled for days to send a very important professional fax. I finally gave up and tried the one thing I hadn't done - change the toner cartridge - and now the fax function suddenly works. This is so obviously a ploy to make you have to pay to buy their ink before it runs out. I am really annoyed with them. In general it's an okay machine, although I have had one other annoying problem with it (first printouts often have an error message and you have to try again). But this part galls me.