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3D printers are less of a disruptive technology than low cost CNC machines, and the dropping cost of machinery and power tools in general due to low cost Asian manufacturers.

But firearms, while crucially important for personal defense, aren't the really disruptive technology. The really disruptive technology is all around us, namely cell phones with data links, GPS sensors, and internet access, and all manner of systems based on low cost computing.

All of the necessary technology for surveillance, data gathering, and producing interactive maps is already available. That technology can be used by the government to limit freedom, but also by the public to protect freedom. With close enough surveillance of the government itself, it becomes very hard for the state to infringe on the rights of the citizens.