These printers use the RC300BK cartridge:
Star-Micronics MP 300
Star-Micronics MP 312 F
Star-Micronics MP 317
Star-Micronics MP 321 S-24
Star-Micronics MP 322 S-24
Star-Micronics MP 323 S-24
Star-Micronics MP 342
Star-Micronics MP 347
Star-Micronics MP 352 S
Star-Micronics MP 382
Star-Micronics SP 300
Star-Micronics SP 310
Star-Micronics SP 311
Star-Micronics SP 312
Star-Micronics SP 316
Star-Micronics SP 317
Star-Micronics SP 320
Star-Micronics SP 321 SProCKET
Star-Micronics SP 322 SProCKET
Star-Micronics SP 323
Star-Micronics SP 341
Star-Micronics SP 342
Star-Micronics SP 347
Star-Micronics SP 348
Star-Micronics SP 349
Star-Micronics SP 389
Star-Micronics UP 389
Citizen MP 300
Citizen SP 300
Samsung ER 350
Samsung ER 550
Samsung ERP 200
Samsung SMP 200
Samsung SRP 100
Samsung SRP 200
Samsung SRP 250
Star SP 300
Star SP 310
Star SP 320