This is what it looked like about 1/2 way finished.
there are a lot of eccentric and non eccentric gear under the top. I had to disassemble twice to get all the parts to align properly. Bottom view shows a cleaver use of a chopped up rubber band to make feet.
There is a video of the final drive train test by hand. This was the third test. Previous two required opening up the case to re-align, make changes. Much more complicated mechanism than the train. I missed a view change from top to bottom and had installed a couple of critical parts upside down. There are almost no instructions per se, just drawings/photo's. You really, really have to pay attention.
http://www.umich.edu/~chuck/geartest.mp4
here is a still shot of the completed project
and this is a movie of the model in action. There is a rubber band motor inside the base
http://www.umich.edu/~chuck/teacupsfin.mp4
[video]http://www.umich.edu/~chuck/teacupsfin.mp4[/video]
Yellow cup wiggles loose after a few runs. Nice model, you need to be careful when assembling to make sure the parts are lining up properly.