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California just passed a law forcing mandatory DRM in 3D printers
(www.theregister.com)
This is a most excellent place for technology news and articles.
It's easy to find examples of homemade guns. Here's a blog full of them: https://www.thefirearmblog.com/blog/author/improguns/
Most of them are made with crude metalworking, not 3D printing. Making a quality firearm is difficult; making one that goes bang most times the trigger is pulled is not.