Re: 3d Printing
Good 3D printing results requires some work post printing. You will probably want to sand down the model a bit when it comes out of the printer to smooth out any roughness etc, and then some people recommend a good coat of lacquer or such to seal them. PLA is water soluble, and Nylon absorbs atmospheric moisture, so a coating is usually a good idea for long-term stability.
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FYI: Laser burns HURT!
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