Combined ink family keying for an ink cartridge

An ink cartridge (12) comprising: an insertion key (40) located at a trailing edge portion (38) of the ink cartridge (12), said insertion key (40) being configured to provide a pivotal reference point for insertion of the ink cartridge (12) into of a carriage assembly (16), characterized by an insertion groove (56) located at a front edge portion (20) of said ink cartridge (12), said insertion slot (56) being configured to receive an alignment post (54) located on said carriage assembly (16) to secure said ink cartridge (12) within said carriage assembly (16).