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@seamster, thank you for your interest!I can try to break it down a little more. Software wise, I was using MODO to model the nozzel, though there's no big advantage in that. For the machinery I was using the PotterBot by Deltabots for this experimentation and printed the nozzel heads with normal PLA on a Printerbot Simple. Material wise I was using a white clay that was softened a little with water. If you want to make the extrusion diameter smaller I suggest a more liquid clay mixture. It was kind of trial and error with the clay to water mixture, but it really depends on what the nozzel you are trying to use is like. Hope that was a little more informative!
3D Print Clay NozzelView Instructable »