Opening the profile GrabCAD sharing the models mentioned in the various articles.
To view the profile: Alessandro Mastrofini GrabCAD
CAD modeling
CAD models are structures designed using computer and computer graphics. The acronym indicates computer-aided-design systems that aim to create 3D models of the product.

If a 3D model is created, it can be used for calculations such as static, dynamic and structural analyzes and in this case we speak of computer-aided engineering (CAE), a broader discipline of which CAD constitutes the subset of actions and tools aimed at to the purely geometric realization of the model.
GrabCAD
GrabCAD, inc. is a startup born in Cambridge that allows the sharing of CAD models and creates a collaborative environment for teams of engineers.
It started as a community where engineers could upload and download models from a free CAD library.
Today the Community is made up of over 5,220,000 users and approaches 3,120,000+ open source models. The community also offers a number of challenges with rewards, from Ultimaker’s “3D Printer Toy Design Challenge” to GE’s “Jet Engine Bracket Challenge”, as well as pro bono challenges such as ModVic’s “Steampunk Chair” and the “Eye Challenge”.
In April 2013, GrabCAD released Workbench, a free cloud-based collaboration solution that helps engineering teams manage, share, and view CAD files. Workbench is used by companies to support the design of physical products ranging from basic screws to jet engine brackets.