We report a single step procedure for aspheric shaped microlens formation. By means of the ink-jet printing technique, microdroplets of mixtures of solvents with different volatilities are deposited on a soluble polymer substrate. The generated microstructures (diameter in range of about 200 mu m-5 mm) exhibit a pronounced focusing effect. The method can be extended to one-dimensional and two-dimensional microlens arrays. (c) 2006 American Institute of Physics.