Its probale that Zepper is correct---its sound similar to the chipping scheme in other HP printers---with a N or two or four--with N+1= the number of empty cartridges with unique serial numbers one must shuttle through
the printer before the register forgets the previous cartridge data.
But at least with OEM cartridge and OEM ink prices, HP still is not competitive with Canon OEM cartridges---the Canon CLI-5 large text black lists at $16.25 and has 26 Ml of ink---the HP#88 black text lists at $40. and contains 58.5 Ml of ink---so HP charges 68.4 cents/ML and Canon only 62.5 cents per ML---in the CLI-8 colors Canon charges $1.096/ML and HP is charging $1.47/ML in the #88 colors.------any non chipped Canoms using the BCI-3&6
are even cheaper using full OEM list price------coming in at 51.9 cents/ML text black and 81.7 cents/ ML of color ink.
But using Zepper's Swift ink prices for a totally third party Canon BCI-3&6 Cartridges, one can divide those figures with a factor of 4 or so with list prices and maybe by a factor of 5 on sale.
The question is and remains, are the third party cartridges for the K-550 that will supposedly become available totally third party-- as in 100% non-HP---or some remanufactered cartridge that has some actual HP parts. Because if the HP K-550 has some non-passive chipping scheme--anything non-HP that clones the chip may involve patient law violations possibly making the cartridge legally sellable in some locations--but likely not in the US. And without a price and actual amount of ink in a cartridge figures, its impossible at present to compute how a third party cartridge for the K-550 stacks up on costs per ML of ink.
But at this point I should confess that there is another joker in the deck---when one gets a inkjet cartridge---any cartridge--and runs that cartridge to the point where it quits printing---there is a substantial amount of ink still retained in the sponge--in the case of a Canon BCI-3&6 I do have the figures which is something on the order of 25% of cartridge capacity--I have no reliable figures on HP's but suspect its somewhat similar--but I also have reiable
figures that suggest certain third party non-canon prefilled Cartridges do retain substantially more ink in the sponge---so the sponge material chosen is an added joker.