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For the exhibit display specimens, I have been doing some post processing, usually limited to assembly of components for larger pieces and some light surface treatment prior to painting. I've had very good results with coating the prints with XTC-3D resin. If the pieces are printed at a very high resolution, very little resin is needed. After shooting on a coat a primer and painting them (by hand), the macromodels don't look like 3D prints at all, and very much resemble the biological specimens from which they are derived. You can see a few more pieces in this video:https://www.youtube.com/watch?v=HWROHjSzUfE&t=19s
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