These printers use the 18C0031 cartridge:

Lexmark Color Jetprinter Z-810
Lexmark Color Jetprinter Z-812
Lexmark Color Jetprinter Z-815
Lexmark Color Jetprinter Z-816
Lexmark Color Jetprinter Z-818
Lexmark Home Copier Plus
Lexmark P 915
Lexmark P 4330
Lexmark P 4350
Lexmark P 6210
Lexmark P 6250
Lexmark P 6350
Lexmark P 8350
Lexmark Photo JetPrinter P-915
Lexmark Photo JetPrinter P-6250
Lexmark X 2500
Lexmark X 2530
Lexmark X 2550
Lexmark X 2600 AIO
Lexmark X 2600 All In One
Lexmark X 2620
Lexmark X 2630
Lexmark X 2650 AIO
Lexmark X 2650 All In One
Lexmark X 2670
Lexmark X 3330
Lexmark X 3350
Lexmark X 3530
Lexmark X 3650
Lexmark X 4350
Lexmark X 4650
Lexmark X 5070
Lexmark X 5075
Lexmark X 5210
Lexmark X 5250
Lexmark X 5250 All In One Printer
Lexmark X 5260
Lexmark X 5270
Lexmark X 5270 All In One Printer
Lexmark X 5320
Lexmark X 5340
Lexmark X 5410
Lexmark X 5450
Lexmark X 5470
Lexmark X 5495
Lexmark X 5650
Lexmark X 5650 ES
Lexmark X 6650
Lexmark X 6675
Lexmark X 6675 All In One
Lexmark X 7170
Lexmark X 7170 All In One Printer
Lexmark X 7300
Lexmark X 7300 Series
Lexmark X 7350
Lexmark X 8350
Lexmark Z 810
Lexmark Z 812
Lexmark Z 815
Lexmark Z 816
Lexmark Z 818
Lexmark Z 818 ColorJet Printer
Lexmark Z 845
Lexmark Z 1300
Lexmark Z 1310
Lexmark Z 1320
Lexmark Z 1410
Lexmark Z 2300
Lexmark Z 2320
Lexmark Z 2420