Abstract: A method and apparatus are described for forming a structure on a substrate. The structure may be a circuit element. The method uses a digital specification 910 for forming the structure, including specifications for printing and curing. The structure is printed (step 112) using a drop-on-demand printer 400, wherein the printing dispenses at least one material on the substrate 420 according to the digital specification 910. The structure is cured (step 130) by irradiating the dispensed material from one or more electromagnetic radiation sources 520, 525 in the printer 400, wherein curing parameters are specified by the digital specification 910 to obtain a desired electrical property when the structure is a circuit element. The curing specification may specify the intensity of the irradiation and the location of irradiation points in the print region.