Users are provided with hosting for their site and a Web-based interface where they can enter their posts. (Disclosure: Forbes.com uses the TypePad service to power its blogs, including one by the author of this story.) Six Apart also operates LiveJournal, a popular free blogging service, and sells Movable Type, blogging software which companies and individuals can install on their own Web servers.

FORBES: Silence Of The Blogs

Still others install a soft bar between you and the keyboard to ensure your wrist stays straight while you type.

BBC: Change your life, not your keyboard

The government may simply insist that 3D printer manufacturers install software that prevents printing of a hollow cylinder of a certain size, a firing pin, or a certain type of spring.

FORBES: Five Reasons Gunmakers Have Nothing To Fear From 3D Printed Guns