Patent ID: 7761031

Claim:
A modified printer cartridge being initially a first printer cartridge configured to operate with a first printer, the first printer cartridge comprising a waste hopper configured to store excess toner during printing, a first toner hopper connected to the waste hopper, a drum positioned within the printer cartridge, the drum being attached to the printer cartridge by a drum axle, a first drum axle bushing configured to surround the drum axle, a first end cap attached to the first toner hopper, the first end cap comprising a sidewall, the first toner hopper comprising a sidewall in parallel position relative to the end cap sidewall, the first end cap further comprising an end cap surface positioned in between the first toner hopper sidewall and the end cap sidewall and a first guide key attached to the end cap surface, the modified printer cartridge comprising: a. a modified toner hopper connected to the waste hopper, the modified toner hopper being configured to store toner for printing, the modified toner hopper being configured to replace the first toner hopper, the modified toner hopper having larger toner capacity than the first toner hopper, wherein the modified printer cartridge is configured to operate with a second printer, the second printer being distinct from the first printer.