Cartridge fillers are responsible for refilling ink and toner cartridges in order to keep printers running. They use INKS and toners to refill the cartridges, which are typically made of plastic or metal and contain a spongy material that absorbs the ink or toner. Cartridge fillers must be careful to ensure that the cartridges are filled correctly and that the correct amount of ink or toner is used. They must also check for any signs of damage or leakage before refilling the cartridges.