a piezoelectric ink jet head that includes a polymer film , for example a flex print , located between the piezoelectric element and the reservoirs in the jet body . the film provides an efficient seal for the reservoirs and also positions the electrodes on the side of the piezoelectric element in which motion is effected , which can reduce the magnitude of the drive voltage . this location of the compliant flex print material also can enhance electrical and mechanical isolation between reservoirs , which improves jetting accuracy . the compliance of the polymer also reduces strain on the ink jet head .