The 3Doodler is a 3D pen developed by Peter Dilworth, Maxwell Bogue, and Daniel Cowen of WobbleWorks, Inc.. The 3Doodler works by extruding heated plastic that cools almost instantly into a solid, stable structure, allowing for the free-hand creation of three-dimensional objects. It utilizes plastic thread made of either acrylonitrile butadiene styrene ("ABS"), polylactic acid ("PLA"), or “FLEXY”, thermal polyurethane (“TPU”) that is melted and then cooled through a patented process while moving through the pen, which can then be used to make 3D objects by hand. The 3Doodler has been described as a glue gun for 3D printing because of how the plastic is extruded from the tip, with one foot of the plastic thread equaling "about 11 feet of extruded material".
