Cosmo Wenman generated this 3-D model of the Ares Borghese, based on hundreds of photos, from the Basel Sculpture Hall. Wenman publishes the scans online, so that anyone can use them to 3-D print a replica of the masterpiece. Courtesy of Cosmo Wenman hide caption

itoggle caption Courtesy of Cosmo Wenman

A 3-D printed bust of Yoda is one of the more popular digital designs shared on Thingiverse. Courtesy of StruveDesigns.com hide caption

itoggle caption Courtesy of StruveDesigns.com

This AR-15 rifle's lower receiver (in soft green color) was produced with a 3-D printer. The 3-D printing industry has criticized the use of the technology for gun part making. Courtesy of Defense Distributed Dev Blog hide caption

itoggle caption Courtesy of Defense Distributed Dev Blog