Wobbleworks, a toy company based in Boston, has invented the 3Doodler. This pen lets you create 3 dimensional doodles with freestanding structures. It works like a 3-D printer with a hot glue gun concept. It uses either Acrylonitrile Butadiene Styrene (ABS) or Polylactic Acid (PLA) as the plastic thread by melting, and it cools during the process as you move the pen.
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