Selective Laser Sintering offers a no limits approach to building as there is no support material required.  It uses powdered nylon as the medium to melt (sinter) the material together layer by layer.  As a result, as-printed parts will have a grainy surface finish and can be porous to liquids.  There are numerous post processes available to remedy this such as dying, infiltrating, sanding, painting, plating, EMI shield, etc.  Materials are all nylon based but additives are available such as glass, carbon, and aluminum.

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