Lexmark toner cartridges are twice the price of Samsung cartridges, and they're the same cartridge. But the Lexmark printer has a little pin which prevents you from using the lower cost Samsung cartridge.
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The popular Brother laser printer has a copy counter which calls for a new cartridge long before the toner is used up. As a result, you buy 3 or 4 times as many toner & drum cartridges as you need! There is a simple work-around -
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