These printers are compatible with the C3909A toner cartridge

CANON LBP VX
HP LaserJet 5MP
HP LaserJet 5P
HP LaserJet 6MP
HP LaserJet 6P
HP LaserJet 6P se
HP LaserJet 6P si
HP LaserJet 6P xiCANON LBP 2460
CANON LBP WX
CANON LBP X
CANON P 550
DATAPRODUCTS DDS 24
DATAPRODUCTS DDS 24T
DATAPRODUCTS LZR 550
DEC LN 24
HP 5si Mopier
HP LaserJet 5si
HP LaserJet 5si MX
HP LaserJet 5si NX
HP LaserJet 8000
HP Mopier 240
HP Mopier 320
IBM 4324
IBM Network Printer 24
IBM NP 24
IBM Optra N
IBM UP 24 PS
INTERFACE 9324
INTERFACE 9624
LEXMARK 4040
LEXMARK Optra 240
LEXMARK Optra 245
LEXMARK Optra N
LEXMARK Optra N Pro
NASHUATEC C 903
OCE 6535
QMS 2425
QMS 2425 EX
QMS 2425 FX 1
QMS 2425 FX 2
QMS 2425 Turbo
QMS 2425 Turbo EX
QMS 2425 Turbo Mult
TROY 524 UTAX M.O.P. 24+