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Talking parts for printing. Check thingiverse, grabcad and turbosquid for amazing work of thousands of modelers that are crazy enough to show off and share them for free. But many might not be printable.... then you need to use......
There is a spray called cyclododecan. Its being used in archeology and art to protect things. It covers the object with white color but disappears completely after a few days. Unfortunately there is problems with shipping ad it must not go in airplanes. But I believe you can also order the material as a block and mix it yourself. I have seen automotive service providers use it for benchmark scanning interiors of cars. The other option is developer spray. Thats being used to detect cracks in metal. Makes a nice dull surface and doesnt add much material, just a few microns.
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