Samsung Black Print Cartridge (3,000 Pages) for Samsung SCX4321 Printers. The Samsung SCX-4521D3 print cartridges are economical cartridges for excellent print value for low-volume users and specifically designed to assure optimal print quality with crisp, dark output from first print to last. The easy-to-install cartridge and advanced toner work with the multi-function printer for cost-effect, reliable operation and sharp, professional results as always.