This has been one of the greatest yet super on the down low hack. Costco wants you to buy those new cartridges so you have to know they do it to get it done. Ain't no big signs at my Costco announcing this service.
Let's face it, ink cartridge manufacturers like to give you "low ink" or "empty" warning messages even when you know that can't be possible. However, there is an interesting hack that may work on some brands that will trick your computer into squeezing every last ounce left in it.