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

toggle 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

toggle caption Courtesy of Defense Distributed Dev Blog

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