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Originally Posted by Wodnek
The cannons are not a true ink jet. They are a bubble jet. Although I can't remember exactly what the difference is. Their cartidges are just ink tanks that feed their nozzles. This makes them alot less expensive, plus you get alot more ink then you get in the tri color cartidges. Another benefit is that if you print alot of red you can buy the one color.
With Lexmark and HP you are changing the print heads every time you change the cartridge.
I have only seen Cannon printers however. I haven't seen a multifunction device.
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Actually, Canon, HP, and Epson are all "true" ink jet printers, they simply employ different technologies or variants of the same technology: HP and Canon both use thermal-based ink jets, with Canon using a slightly different spin on it (the "bubble" jet to which you refer), while Epson has piezo element based ink jets.
It is correct that with most HP's, you are changing out the print head (and hence the nozzles) with each combined cartridge; while this eliminates issues such as nozzles being clogged, or printheads being permanently damaged when driven with no remaining ink, it does add to both the cost and wasted ink when only a single color is nearing empty.
I have found Canon to be the most economical to operate, with no major printhead issues despite the embedded (though user-replaceable) printhead; Epson has very good image quality but almost invariably ends up with printhead issues over time, and at a much faster rate than Canon units with which I have dealt.