Ink jet printer and an ink supply system therefore

An ink jet printer including an ink-supply system comprising:

• a lower ink container, an upper ink container, a printhead with nozzles, wherein an ink circulator is provided for circulating ink from said lower container to said upper container and from said upper container through said printhead back to said lower container, wherein said upper container, having a bottom wall and side walls and containing ink forming an ink surface at a height h1 above said bottom wall, has at least two compartments, a first one with an inlet for ink wherein said inlet contains a flow guiding device for avoiding directional flow of said ink towards said ink surface and a second one, separated from said first one by a partition extending from said bottom wall to a height h5 above said bottom wall wherein h5>h1, and having an opening, with height h4, so that said two compartments communicate only in the lower half of said upper container.