Pretty cool and it sounds like its a one shot job. But the politics of it have already started.
http://www.3ders.org/articles/20130503-the-worlds-first-entirely-3d-printed-gun-is-here.html
Chucky Schumer (NY) is already proposing it be illegal to print out a gun. Gee like criminals will be paying attention to that law. Not to mention it would be easier to get a gun than wait for a single shot one to print out.
http://www.ny1.com/content/top_stories/181565/schumer-aims-to-ban-3d-printed-plastic-guns