A team of logistic Marines has printed a functional concrete footbridge without having to mix gravel and other heavy materials at the build site. Members of 1st Marine Logistics Group made history last month when they completed the first 3D-printed bridge in the U.S. The Marines built the bridge during Exercise Steel Knight in California, using a special printer developed by the Army and NASA. The printer can create structures on demand, cutting construction time from five days down to one. The Marines also used a special concrete mixer for the bridge materials, a job that would normally require six people. Read more about the bridge in this Military.com story.
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