Generally, when you buy a printer, it comes in already with a toner and drum unit (if it uses them). So no, when you initially bought printers, you did not have to buy them, however, these cartridges are usually not filled in all ways and you will need to move them to some point in the future. Toner and drum require assembly after purchasing two different parts. Do not worry, however, keeping them together is very simple once the cover is removed from the toner, you slide it into the drum unit and then put the whole bundle in the printer. If you face any difficulty with this you can contact our experts through Brother Printer Technical Support Number +1-888-600-6920 (toll-free).
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