3D Systems, headquartered in Rock Hill, South Carolina, is a company that engineers, manufactures and sells 3D printers, 3D printing materials, 3D scanners, and offers a 3D printing service. Chuck Hull, the CTO and former president, invented stereolithography in 1986. The company creates product concept models, precision and functional prototypes, master patterns for tooling, as well as production parts for direct digital manufacturing. It uses proprietary processes to fabricate physical objects using input from computer-aided design and manufacturing software, or 3D scanning and 3D sculpting devices., 3D Systems' technologies and services are used in the design, development and production stages of many industries, including aerospace, automotive, healthcare, dental, entertainment and durable goods. The company offers a range of professional- and production-grade 3D printers as well as software, materials, and the online rapid part printing service On Demand. It is notable within the 3D printing industry for developing stereolithography and the STL file format.