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There are now hundreds of different free 3db software tools available for people looking to create their own 3d models users can export their models and either 3d print them or post them online so fans can download them. The list also indicates whether the software uses solid modeling, a type of 3d modeling that always generates models that are manifold” or water tight.” a manifold model is one in which all walls of the model have some thickness, which is necessary for 3d printing. What makes it special: it's designed to allow anyone to create 3d printable models and serves as an introduction to solid modeling.