These printers use the TK-312 cartridge:
Click On a Printer to View it's Cartridges
          Kyocera-Mita FS 2000 D
          Kyocera-Mita FS 2000 DN
          Kyocera-Mita FS 3900 DN
          Kyocera-Mita FS 4000 DN
          Kyocera FS 2000 D
          Kyocera FS 2000 DN
          Kyocera FS 3900 DN
          Kyocera FS 4000 DN
          Royal-Copystar FS 2000 D
          Royal-Copystar FS 2000 DN
          Royal-Copystar FS 3900 DN
          Royal-Copystar FS 4000 DN