These printers use the RC300PL 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