Print head cartridge made with jointless one-piece frame consisting of a single material throughout

A cartridge for an ink jet printer, said cartridge having an ink reservoir therein, said cartridge comprising:

• a rigid jointless monolithic frame consisting of the same material throughout and having
• an interior surface facing an opening extending through the frame from a first side to a second side, said interior surface comprising a peripheral wall of said ink reservoir,
• an exterior surface which comprises a peripheral exterior surface of said cartridge, and,
• first and second bonding surfaces spaced from each other and surrounding said opening, said first and second bonding surfaces facing first and second sides, respectively, of said frame;
• first and second flexible films comprising first and second side walls, respectively, of said ink reservoir, and,
• an adhesive bonding material securing said first and second films to said first and second bonding surfaces, respectively,
• said frame comprising an outer frame portion and a support shelf spaced from said outer frame portion by cavities, said exterior surface being on said outer frame portion and said first and second bonding surfaces being on said support shelf bounded by said interior surface and said cavities.