A Fully Functional 3D Printed Watch With Tourbillon

So when does something change from a watch into a clock? This thing is the size of a fist

So this project is really cool, but its not the first.

http://www.thingiverse.com/thing:328569

That has been sitting in my print queue for some time waiting to be printed

This is pretty cool. I have yet to do anything so mechanically complicated on my printer. I was under the impression that it would be insufficiently round but perhaps I just need to spend more time calibrating it.

I wonder how accurate this is. I had assumed making a balance spring precise enough to be reasonably reliable was extremely difficult. Being made of a plastic like substance that can only be accurate down to a visibly low resolution, I would guess it's not very accurate. Sort of a moot point considering the main spring only lasts 30 minutes.

> will run for 30 minutes

And thus a challenge is created.

Url changed from http://gizmodo.com/the-first-3d-printed-mechanical-watch-is-..., which points to this.