Ink cartridge with bubble point pressure regulator defined in laminated wall

An ink cartridge for an inkjet printer, wherein a laminated wall of said cartridge defines:

• an air inlet;
• a regulator channel having a first end communicating with the air inlet and a second end defining a bubble outlet, said bubble outlet being positioned for bubbling air bubbles into a headspace of the cartridge at all operative ink levels;
• and
• a wetting system for maintaining at least some liquid in said regulator channel at all operative ink levels, thereby ensuring that air entering the headspace first passes through said liquid,
• wherein said regulator channel is dimensioned to control a Laplace pressure of air bubbles drawn from said bubble outlet as result of supplying ink to a printhead, thereby regulating a hydrostatic pressure of the ink.