A method of producing a model of a human lung includes preparing a computer file within a computer aided design system, mathematically slicing the computer file into a plurality of layers to produce a sliced computer file, providing the sliced computer file to an additive manufacturing apparatus, and fabricating, with the additive manufacturing apparatus, a 3D object based on the sliced computer file. The model of the human lung may be utilized to evaluate surfactant treatment, to improve subsequent surfactant administration to a human patient.