A ink drop ejection device that has a nozzle and a bubble forming chamber for holding ejectable liquid. At least one heater element is suspended in the bubble forming chamber to heat the ejectable liquid to a temperature above its boiling point to form a gas bubble therein. The generation of the bubble causes the ejection of a drop of the ejectable liquid (such as ink) through the nozzle to effect printing. The heater element is configured such that the strain of thermal expansion is not relieved by bending about its thinnest cross sectional dimension.