The core activity of Gfeller Design encompasses three main areas: 1. 3D Scanning: Creating digital models of physical objects through 3D scanning technology. 2. Reverse Engineering: Analyzing and reconstructing existing products or parts to understand their design and functionality, and potentially improving them. 3. Mechanical Engineering: Developing, designing, and manufacturing mechanical components and systems, including the production of parts through additive manufacturing (3D printing) or in collaboration with external manufacturing partners. The company's core activity focuses particularly on the digitization and manufacturing of parts for vintage vehicles and mechanical engineering.