These printers use the C3909A cartridge:
Click On a Printer to View it's Cartridges
          HP 8000
          HP LaserJet 5 SI
          HP LaserJet 5 SI MOPIER
          HP LaserJet 5 SI MX
          HP LaserJet 5 SI NX
          HP LaserJet 8000
          HP LaserJet 8000 MFP
          HP LaserJet 8000 DN
          HP LaserJet 8000 N
          HP LaserJet 8000 Series
          HP Mopier 240
          HP Mopier 240 Network MFP
          HP Mopier 320 Network MFP
          Burroughs-Unisys UDS 9624
          Canon LBP 930
          Canon LBP 930 EX
          Canon LBP 930 EXN
          Canon LBP 2460
          Canon LBP WX
          Canon LBP X
          Canon P 550
          Canon Series 5 SI
          Canon Series 5 SIMX
          Dataproducts DDS 24
          Dataproducts DDS 24 T
          Dataproducts Digital Document Server 24
          DEC LN 24
          Digital-DEC LN 24
          Hitachi Beamstar M-324
          Hitachi PC PL-2600
          IBM 4324-001
          IBM 4324-003
          IBM 4324 Network Printer
          IBM 4324 PS
          IBM Network Printer 24
          IBM NP 24 Network PTR 24
          IBM Optra N model 240
          IBM Optra N model 245
          IBM UP 24 PS
          Interface-Systems 9324
          Interface-Systems 9624
          Konica Print System 2425
          Konica-Minolta Print System 2425
          Lexmark 4040
          Lexmark Optra N-240
          Lexmark Optra N-245
          Lexmark Optra N model 240
          Lexmark Optra N model 245
          Lexmark Optra N Pro
          Lexmark Optra N Series
          Mopier 8000
          OCE 6535
          QMS PrintSystem 2425
          Source-Technologies ST 4024
          TROY-Systems 624