LAS VEGAS, NV - JANUARY 04:  A 3D drawing pen from xyzPrinting is displayed during a press event for CES 2016 at the Mandalay Bay Convention Center on January 4, 2016 in Las Vegas, Nevada. PLA, a corn-based plastic material, gets pushed through the tip of the pen so that it comes out melted and then cools so the user can draw 3D objects with no computer or software. IT can also be used to repair 3D-printed items. CES, the world's largest annual consumer technology trade show, runs from January 6-9 and is expected to feature 3,600 exhibitors showing off their latest products and services to more than 150,000 attendees.  (Photo by Ethan Miller/Getty Images)