Autodesk 123D is a suite of hobbyist CAD and 3D modelling tools created by Autodesk. It is similar in scope to Trimble SketchUp and is based on Autodesk’s Autodesk Inventor. As well as the more basic drawing and modelling capabilities it also has assembly and constraint support and STL export. Available for the software is also a library of ready-made blocks and objects.
Autodesk is also working in collaboration with three companies (Ponoko, Techshop and 3D Systems) to enable users of 123D to create physical objects from their designs using 3D printing technology.