Lexmark 40x8081 is compatible in the following Printer Models:

Lexmark Multifunction Mono Laser

Lexmark MX410de (7015-470)
Lexmark XM1140 (7015-479)

Lexmark Mono Laser

Lexmark MS315dn (4514-335)
Lexmark MS410d (4514-420)
Lexmark MS410dn (4514-430)
Lexmark M1140 (4514-439)
Lexmark MS415dn (4514-530)
Lexmark M1140+ (4514-539)
Lexmark MS510dn (4514-630)
Lexmark MS610dn (4514-635)
Lexmark MS610dtn (4514-635)
Lexmark M3150dn (4514-638)
Lexmark M1145 (4514-639)
Lexmark MS610de (4514-646)
Lexmark MS610dte (4514-646)
Lexmark M3150 (4514-649)
Lexmark MX410de (7015-470)
Lexmark XM1140 (7015-479)