HP Paper Q6594A is compatible in the following HP Models:

HP Deskjet D4200 Printer series

HP DESKJET D4245 PRINTER - CB643A
HP DESKJET D4260 PRINTER - CB641A
HP DESKJET D4260 PRINTER - CB641B
HP DESKJET D4260 PRINTER - CB644C
HP DESKJET D4263 PRINTER - CB641C
HP DESKJET D4268 PRINTER - CB641D

HP Deskjet D2400 Printer series

HP DESKJET D2430 PRINTER - CB614A
HP DESKJET D2445 PRINTER - CB613A
HP DESKJET D2460 PRINTER - CB611A
HP DESKJET D2468 PRINTER - CB612D

HP Deskjet 9600 Printer series

HP DESKJET 9650 PRINTER - C8148A
HP DESKJET 9670 PRINTER - C8149A

HP Deskjet 9300 Printer series

HP DESKJET 9300 PRINTER - C8142A

HP Deskjet 6600 Printer series

HP DESKJET 6620 COLOR INKJET PRINTER - C9034A
HP DESKJET 6620 COLOR INKJET PRINTER - C9034B
HP DESKJET 6620XI COLOR INKJET PRINTER - C9056A
HP DESKJET 6623 COLOR INKJET PRINTER - C9034C
HP DESKJET 6628 COLOR INKJET PRINTER - C9034D

HP DesignJet 130 Printer series

HP DESIGNJET 130 PRINTER - C7791C
HP DESIGNJET 130NR PRINTER - C7791D

HP DesignJet 110plus Printer series

HP DESIGNJET 110PLUS NR PRINTER - C7796E
HP DESIGNJET 110PLUS PRINTER - C7796D

HP DesignJet 110 Color Printer

HP DESIGNJET 110 COLOR PRINTER - C7796B

HP DesignJet 100plus Printer series

HP DESIGNJET 100PLUS PRINTER - C7796C
HP DESIGNJET 100PLUS REMARKETED PRINTER - C7796CR

HP DesignJet 100 Printer series

HP DESIGNJET 100 PRINTER - C7796A
HP DESIGNJET 100 REMARKETED PRINTER - C7796AR

HP Business Inkjet 2600 Printer series

HP BUSINESS INKJET 2600 PRINTER - C8109A
HP BUSINESS INKJET 2600DN PRINTER - C8110A