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Important printability properties required for appropriate FSE printed trace. (a) Performance parameters of the droplet formation process. Reynolds number (Re), Weber number (We), and Ohnesorge number (Oh) together help to characterize Z, which helps determine the suitability of fluid for printing 1 < Z < 10, considered to be the optimal range of stable droplet formation [57]. (b) Various cross-section profiles of the printed trace depending on the viscosity of the inks.
