There's a story by Cory Doctorow, I forget the title, that deals with what will happen when 3D printing technology gets good enough to print anything, and cheap enough to be everywhere. In that story, the government - in as last-ditch effort to save capitalism - tries to outlaw these cheap 3D printers, and does, but fails to enforce it well enough.

If I knew an appropriate to do it, I'd be sorely tempted to protest or counter-protest with a sign that says "CAPITALISM IS ALREADY DEAD, LIKE COMMUNISM. 3D PRINTING WILL SOON BE OLD ENOUGH TO DIG THE GRAVE."