Hypotrochoid Gears

Aside from looking awesome, which they do, is there a possible mechanical application for these?

Very cool. Check out th web site below for some cool planetary gears:

http://www.andreas-roever.de/img/loony.gif

As far as I know there is no practical mechanical application ;-)

And thank you for the link, hadn't seen that one, and I was already wondering if something like that would be possible :-) Cool !

Wow, that is so cool that works. Awesome job!

That's funny to see that the animation send by Gibell of Andreas Roever's website was initially inspired by Oscar van Deventer, a well known Shapeways' community member :-)
(see details here: http://www.andreas-roever.de/puzzles.html)