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Doingdd has published 3 free 3D printable models with a total of 273 downloads and 8 likes. Most popular categories: IronCAD, OBJ, Parasolid, STEP / IGES, STL, OBJ, Parasolid, STEP / IGES, STL, IronCAD 2009, STEP / IGES, STL. Models available on Grabcad. Active since 2012.