The Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) led a multi-agency working group testing the use of 3-D printing technology in the making of firearms.  This test focuses on the Liberator design.
Top view of the Liberator test fire, made with ABS material.
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<bdo lang="en" dir="ltr"><a href="//commons.wikimedia.org/wiki/Commons:YouTube_files" title="Commons:YouTube files">YouTube</a>: <a rel="nofollow" class="external text" href="https://www.youtube.com/watch?v=zxe_zMJj5m0"><bdi lang="">ATF test of 3-D printed firearm using ABS material (Top View)</bdi></a> – View/save archived versions on <a rel="nofollow" class="external text" href="https://web.archive.org/web/*/https://www.youtube.com/watch?v=zxe_zMJj5m0">archive.org</a> and <a rel="nofollow" class="external text" href="https://archive.today/https://www.youtube.com/watch?v=zxe_zMJj5m0">archive.today</a></bdo>