No. Toner refilling made according to the instructions will never harm your printer. Western countries support toner cartridge refilling to encourage recycling to protect nature. In our country, we sometimes get questions from consumers whether the toner refilling will damage my printer, we are surprised! As far as we understand, original printer services want to direct consumers to purchase original toner with such sentences. Each laser printer should be maintained at certain intervals, and after a certain number of prints, some parts that have expired should be replaced. This is the case even if the original toner is used, it is so even if the toner is refilled.