What is STL format and how I can export from CAD package ?
An STL file is simply a mesh of triangles wrapped around a CAD model was defined by 3D systems in 1980s. STL, name is derived from rapid prototyping process, StereoLithography, also known as abbreviation of Standard Triangulation Language. This very simple format has become an industry standard for the Rapid Prototyping sector. Virtually all modern CAD systems now include STL or Rapid Prototyping output as a standard feature.