A great example of using a 3D printer to make something that makes things. It’s available on Thingyverse and coupled with a powerful vacuum you can make molds of anything you like. The creator says you can use it to make molds of 3D things you have printed. I suppose you could also just print the mold directly but then you don’t get a decent enough mold for making chocolate wonders.
The OTM-02 (Open source Time Machine – version 2) is an open source watch design in development. The 7mm watch module will be housed in a 3D printed case, an intermediate design of which is pictured above. The development is still in progress with the release of a 3D CAD data for a printable case planned for end of April 2013.
Back in the day, big mechancial hard drives could be made to sing by vibrating the unit with the appropriately choreographed seek commands sent to the read head. Well, now you can do it with your 3D printed. Be careful you don’t shake it apart though.