Lexmark 40X8121 is compatible in the following Printer Models:

Lexmark Paper Handling

MX610, MX611 Stapler (9025-047)
Staple Finisher (9025-049)

Lexmark Multifunction Mono Laser

Lexmark MX610de (7016-630)
Lexmark MX611de (7016-670)
Lexmark MX611dte (7016-670)
Lexmark MX611dhe (7016-675)
Lexmark XM3150 (7016-679)
Lexmark XM3150h (7016-679)
Lexmark MB2650ade (7018-676)
Lexmark MX622ade (7018-676)
Lexmark MX622adhe (7018-678)
Lexmark XM3250 (7018-679)

Lexmark Mono Laser

Lexmark MX610de (7016-630)
Lexmark MX611de (7016-670)
Lexmark MX611dte (7016-670)
Lexmark MX611dhe (7016-675)
Lexmark XM3150 (7016-679)
Lexmark XM3150h (7016-679)
Lexmark MB2650ade (7018-676)
Lexmark MX622ade (7018-676)
Lexmark MX622adhe (7018-678)
Lexmark XM3250 (7018-679)