It's been a few months since the last Pinshape design contest we talked about, but we're happy to announce that the wait is over! The popular online marketplace for 3D printable models is announcing a new contest, the Mechanical Design Challenge, sponsored by Formlabs, 3D Hubs, Prusa Research, and Adafruit. Pinshape has held all sorts of 3D design challenges, from cosplay and superheroes to bike accessories and jewelry, but this is the first time it's focused on mechanical design. The challenge has already begun, and will end on June 15th. Read more at 3DPrint.com: http://3dprint.com/174853/pinshape-3d-design-challenge/