Abstract: A thermal ink jet printing head is disclosed in which ink is fed from a reservoir to a recessed formation defined between two plates. The two plates are moveable with respect to each other. Between the two plates and connected with the recessed formation are a plurality of grooves corresponding to a number of adjacent dot elements. There are more grooves than dot elements, and ink resides within the grooves. Therefore, electrical signals sent to the dot elements cause heating of the thermal dots which cause the ink within the grooves to bubble and spray out of the grooves to a printing surface.