Also known as Clock-in-a-Cage!
WARNING! Since we still don't have a working escapement mechanism (see test jig #2 http://www.thingiverse.com/thing:8275 ), this is NOT a working clock, yet. Hopefully, it will be eventually. :-)
The Planetary Gearbox Clock is a collaboration with Emmett, who designed the original planetary gearbox and helped design and stack two of them with a 60:1 and 12:1 ratio respectively. I just slapped the escapement system on the back side and designed a cage-frame around it. The dove-tail snap-fit tabs for the cage I took from relet's excellent http://www.thingiverse.com/thing:6214 .
The intent was to do away with concentric shafts altogether, by putting the entire gear-train inside the shaft, as it were. The frame must hold the stator rings without interfering with the hands that stick out the side of the rotor rings, hence the cage design.
This is officially part of the Printable Clock Project and is being maintained on GitHub along with the rest of the code:
The script posted here was used to generate the images, but the latest version will be on GitHub. Feel free to fork it and play with it, any improvements and/or variants welcome!
I will post STLs when it is ready for testing (not until we have a working escapement), and remove the WIP flag when someone has a print of it ticking properly.