Patent ID: 8632172

Claim:
An ink jet printer comprising: a print head for generating ink drops for printing on to a printable substrate; a gutter at the print head for receiving unused drops of ink generated; an ink supply system for supplying ink to the print head; an ink return path for returning ink to the ink supply system; a fluid cartridge comprising: an inner collapsible container for containing a printing fluid, the container having an outlet for connection to the printer; an outer housing in which the container is housed; an electronic storage device configured to store data relating to the contents of the cartridge; and at least one electrical contact associated with the electronic storage device and provided on a substrate; the housing having a first aperture for the outlet and a second aperture that provides access to the at least one electrical contact, wherein the housing comprises a guide feature extending from a surface of the housing and having a T-shaped cross section with a stem and a base wider than the stem, the housing further comprising a ramp adjacent the guide feature, wherein the substrate is disposed between the outer housing and the container; and a fluid cartridge receiving portion arranged to receive the fluid cartridge and to provide fluid communication between the cartridge outlet and the ink supply system, the fluid cartridge receiving portion having at least one electrical contact arranged for electrical contact with the at least one electrical contact on the cartridge when the cartridge is received, the fluid cartridge receiving portion comprising a slot for engaging the guide feature of the cartridge to guide movement of the cartridge relative to the cartridge receiving portion, the ramp of the cartridge engaging a surface of the cartridge receiving portion and raising the cartridge slightly relative to the cartridge receiving portion during docking of the cartridge to bring the guide feature into frictional engagement with edges of the slot.