Inkjet Plotter Film is a sort of computer printing that reproduces a digital image by launching ink droplets onto substrates made of paper and plastic. A stream will naturally separate into droplets due to fluid surface tension. An inkjet nozzle size of roughly 0.003 inches is needed to achieve optimal drop sizes of 0.004 inches. Surface-tension-containing fluids can be made of water, wax, oil, or even melted metal alloys.