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Ours at work uses 2 reels of plastic line. One roll is the modeling material, while the other is for filling in gaps which we call the "support material". These reels (picture thick fishing line) unwind, and go through a heated head in a specific pattern, layer after layer. When the peice is complete, we soak it in a heated bath, which melts away the support material to reveal the part.
This must be hooked to a C.A.D. program on a computer for directions to build.
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