Certainly selling it wouldn't be the point as anyone can make one of their own. The government now and soon will have no idea how many 3D printed firearms are in people's houses. They don't have the resources to effectively monitor every person's Internet for a questionable download. There are also secure means of transmitting information over the Internet. Plans can be passed along by hand on USB sticks as well. This development certainly gives the civilian populace more teeth against a would be despotic government.