Samsung SL-M4020ND-TAA - Manual (Page 55)

Available consumables
55 3. Maintenance
Samsung does not recommend using non-genuine Samsung toner
cartridge such as refilled or remanufactured toner. Samsung cannot
guarantee non-genuine Samsung toner cartridge's quality. Service or repair
required as a result of using non-genuine Samsung toner cartridges will not
be covered under the machine’s warranty.