In collaborative engineering environments, handling large-size 3D CAD models with a high level of detail is becoming more and more challenging. Especially sharing of 3D CAD models between OEMs and suppliers as well as utilization in downstream processes require file size reduction for sufficient performance and IP (Intellectual Property) protection while maintaining the initial design intent. In this context, simplification of 3D geometry provides a valuable solution to companies through enveloping, defeaturing, and extraction of inner/outer surfaces. Lightweight CAD models enable the efficient sharing and communication of relevant 3D product information as the storage of redundant and confidential data is avoided. This is an important basis for efficient collaborative engineering in globally distributed development.