Refill Twice, Then Replace: Cartridge Yield Decay, Print Quality and the Economic Life of a Remanufactured Toner Cartridge

This paper addresses a practical question in remanufacturing: a laser printer cartridge is sold as a consumable and built like a small machine, with a drum, blades and seals that wear at different rates from the toner it contains. Using a self-contained computation from stated assumptions, the study evaluates the options across the range a small operation ordinarily meets and identifies the point at which the balance of cost, quality and material use changes. The headline findings are that cost per 100 new usd is 2.14; cost per 100 refill1 usd is 0.63; cost per 100 refill3 usd is 0.92; cost per 100 refill5 usd is 1.5; refill5 spoil pct is 31.9. These figures come from a simulation study: the work is SIMULATED, NOT MEASURED, no physical trials were performed, and every number reported is taken from the deposited computation output so that any reader can reproduce or refute it with local values. The practical value of the result is a rule that can be applied at the point of work without further calculation, together with the tabulated cases from which the rule was derived and a statement of the assumptions on which it depends. Where the computation shows that a widely used practice wastes money or material, that finding is stated directly; where it shows that a popular economy is genuine, the size of the genuine saving is stated with equal directness, so that effort can be directed to the economies that are worth having.