I've worked with some stereolithography made parts. The 'resolution' wasn't great and the parts had very obvious ridges on them. I don't know that SL is to the point of doing the fine detail of a cascade nozzle piece. Also the material used in the SL process is very brittle. The SL piece can sometimes be used to create a mold for casting epoxy or other plastics, but the quality of the results is not great.
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