hp officejet 8720 , request all color ink , but i had only balck ink ,

[Fuadbhian]

the problem i need only printe plack / whit only , also i removed all cartridge colors , lieave the cartridge black only insdie in print becouz not need the color .

but the printer request buy another color cartridge and not working by one cartridge of balck . 

if the must be need buy new color cartridge . this is big problem if make custemr must be buy color if not need it or this devis not working , this bad idea

if there any solution

[Valsimot]

No, on that printer model, all cartridges must be full to print.