Why Does Printer Ink Run Out When You Hardly Print?

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It is not greed, and the proof is that the behaviour costs the maker money too. An inkjet spends ink on staying alive, that spending is roughly fixed per month rather than per page, and if you print almost nothing then almost all of your ink goes on it. Here is the actual machinery.

A nozzle is an open hole full of water

Start with the thing doing the printing. An inkjet printhead is a plate with hundreds or thousands of nozzles in it, each one a hole in the region of tens of microns across, and behind each one a chamber that flicks a droplet out when it is told to. The ink is mostly water. The outer face of every nozzle is open to the room, with a meniscus of ink sitting in it.

Water leaves an exposed meniscus. As it does, what is left behind gets more concentrated and more viscous, and at some point the actuator can no longer throw it. That is a clog, and the important thing about it is the scale. The plug that disables a nozzle is a speck of thickened ink in the last fraction of a millimetre of a channel. The cartridge behind it can be entirely full and the nozzle is still dead, which is why the obvious objection, that the ink cannot have dried because there is plenty of it, does not land. Almost none of the ink is exposed. The tiny part that is exposed is the part that matters.

Printers fight this with a capping station. When the carriage parks, the head is pressed into a rubber lip that seals the nozzle plate against the air, which slows evaporation enormously. That is also why interrupting a printer at the wall mid-job is the single worst thing you can do to it: the head stops wherever it happens to be, uncapped, and dries.

So the printer spends ink defending itself

Sealing is not enough on its own, so every inkjet also has an active defence, and all of it costs ink.

It primes. On power up, after a cartridge change, and on a schedule of its own, the printer pumps ink through every nozzle to push whatever has thickened out of the way, and that ink goes into an absorbent pad inside the chassis rather than onto paper. It also spits. During a long black only job it will fire the colour nozzles periodically into the same pad, purely so they are still working next week. That is why the colour cartridge empties on a household that only prints bank statements: the colours were not used for your documents, they were used for their own maintenance.

As a rule of thumb across consumer inkjets, that pad is also finite and the printer counts what it has sent there, which is where the eventual end of service life message comes from. None of this is hidden malice. It is the price of keeping a few thousand open water filled holes usable between jobs.

Which turns the cost of a page into a division

Now the arithmetic that answers the question as asked. If upkeep is a fixed amount of ink per month, and you print N pages in that month, then the share of upkeep each page carries is simply that fixed amount divided by N.

That curve is not a measurement of any product. It is one division, plotted, and the shape is the point. Between one page a month and a hundred pages a month, the amount of upkeep ink is unchanged while the share landing on each page falls by a factor of a hundred.

So two households with identical printers and identical cleaning routines experience completely different machines. The one printing a few hundred pages a month barely notices the upkeep. The one printing four pages a month sees cartridges drain with nothing to show for it and reasonably concludes that something dishonest is going on. Both are seeing the same fixed cost from opposite ends.

It also inverts two pieces of received wisdom. Switching the printer off at the wall between uses adds power up priming cycles, so it costs ink to save electricity. And leaving a printer idle for a month to conserve ink is the most expensive thing you can do with it, because you paid the whole month of upkeep and got no pages. If you own an inkjet and use it rarely, printing a single page every week or two is cheaper than printing nothing.

What the machines themselves publish

A wireless colour inkjet all in one with duplex printing is the ordinary case, and its listing is specific about the one thing that matters here: a two cartridge hybrid ink system. It also lists dual band Wi-Fi on 2.4GHz or 5GHz, automatic two sided printing, media up to 8.5 by 11 inches with or without borders, and a 1.42 inch monochrome OLED display for watching ink levels and printer status. Two cartridges means the nozzles live in the cartridge rather than in the printer, which cuts both ways: a nozzle you cannot recover costs you a cartridge instead of the machine, and every cartridge change is a fresh prime. The record is honest that it is not for high volume office use and has no automatic document feeder. Our review of the Canon PIXMA TS6520 has the rest, and the broader comparison is in best photo printers.

The reason this is an inkjet problem rather than a printer problem shows up when you look at a machine with no nozzles. A pocket sized photo printer that prints sticky backed 2 by 3 inch photos runs on HP ZINK paper, where the colour is already in the sheet and heat develops it, so there is no liquid ink anywhere in the device and nothing to dry between uses. Its listing mentions the 10 sheets of 2 by 3 inch paper included, smudge proof prints, peel and stick backing, Bluetooth 5.0 with sleep mode, and an augmented reality app feature. It will sit in a drawer for a year and print on the first try. The trade is that the print size is fixed and small, which its record names as the main weakness. See our review of the HP Sprocket.

The same logic applies at the other end of the house. A four by six label printer with a postal scale built into it is direct thermal, which its record states plainly, along with a 15 kg or 33 lb scale rated to plus or minus 0.1 oz with a tare function, label widths from 1 to 4.6 inches, a bin holding up to 250 four by six labels, Bluetooth 5.0 and USB, and offline printing from over 20 preset templates with no device connected. There is no ink and therefore no idle cost at all. Its record is candid that no print resolution or speed is published and that the listing carries impossible dimension fields. Our review of the Phomemo D422S covers that, and why direct thermal has problems of its own is in can you print shipping labels on a regular printer.

The honest limit

There is no setting that removes the standing cost. You can reduce the number of power up primes by leaving the printer plugged in and letting it sleep instead of switching it off, you can avoid pulling the plug mid job so the head always parks in its cap, and you can print something small every week or two so that the upkeep you are paying for is at least spread over a few pages. That is the whole of the available control.

And the conclusion the arithmetic actually points at, which is not a purchase. If you print a handful of pages a month, an inkjet is the wrong tool and no inkjet is the right one, because the fixed cost is a property of the technology rather than of any model. A laser has powder instead of water and does not care how long it sits. A print shop charges per page with no monthly floor at all. The machine that owes you nothing while it waits is usually the cheaper answer, and for many households the honest recommendation is to own a cheap mono laser for documents and stop asking an inkjet to be patient.