Call me kooky

Came across this link this evening Hp company secrets.

Since I can’t comment there because of the closed commenting I’ll comment here. 
Print heads are reasonably precise.  With the known print head specs you can make a reasonable guess to how much ink flows through the print head to print a page.  To grab numbers, lets say it takes 1ml of ink to print a standard page full of unfancy text.  Do some math and a 20ml print cartridge will last for 20 pages.  ALL printers do this, to a point.  HP, and lately canon, have gotten bitchy about it on the latest model printers.  You got a fancy high end photo printer, you get to deal with smarmy design.  The HP 9x series of cartridges have a page/ink counter in the cartridge itself (I think).  The printer reads this and says “oh you’re out of ink, GIVE US MONEY!”.  Last I heard there’s still no way to reset these cartridges.  Canon has moved to “chipped” cartridges that do the same thing now, still higher overall quality.

Call me kooky (would have been more thought provoking if I hadn’t gotten distracted trying to find a signup for comments over there),
phosphers