Closed ink delivery system with print head ink pressure control and method of same

A fluid supply system comprising:

• a fluid pressure damper able to reduce pressure fluctuations generated in fluid passing therethrough, wherein said damper comprises:
• a flexible film membrane having low air permeability, said membrane positioned inside said damper so as to create two separate spaces within said damper, said two spaces being a fluid space and an air space;
• and
• one or more springs positioned within said fluid space so as to counteract atmospheric pressure on said membrane from said air space and to stretch said membrane.

A fluid supply system comprising:

• an air lung able to deaerate fluid passing therethrough;
• and
• a moveable fluid pressure damper coupled to one or more print heads and coupled to said air lung via a pump,
• wherein said pump is able to pump unused fluid from said damper to said air lung.

A fluid supply system comprising:

• a closed collapsible bag positionable lower than nozzles of one or more print heads coupled to said system;
• one or more sensors able to sense changes in volume of fluid present within said bag;
• and
• a pump coupled to said one or more sensors and to said collapsible bag, said pump able to pump additional fluid into said bag when said volume is less than a predetermine volume.