Atari Flashback 2 Joystick repair
A couple of months ago I picked up a Atari Flashback 2 from a charity store for $10. The only problem was that someone had gotten over excited and broke the joysticks. What better use of a 3D printer than to generate new joystick parts.
See http://www.instructables.com/id/Atari-FlashBack-2-Fix-broken-Joystick-3D-print site for more details on the repair.