STL is a popular file format for stereolithography and has become the Rapid Prototyping industry's defacto standard data tyransmission format. This format approximates the surface geometry of a 3D object with triangles.

3D printing is the production from 3D data of physical models which are more accurate, affordable, durable and quickly produced than traditional handcrafted models. As architects and engineers start their digital designs earlier and keep them digital for longer, they want a way to still physically interact with their designs. With the economical availability of 3D printers this has become possible. 3D printed models increasingly serve as a critical part of the design process to sudy design ptions and improve communication between in this way, the Revit platform for building information modeling and 3D printing are cocused on the same goals: gaining better insight earlier & serve as critical part in the design process to study and repidly iterating through different design options to improve collaboration and communication among all stakeholders like projects members and owners.