For this experiment, I rebuilt the mechanism in Experiment #3 so there are two levels of curved LEGO beams spinning about the same axis. This meant designing a new hub and printing one as a ring and one with the center cross for a Technic axle. Thanks to David Roy www.woodthatworks.com for the inspiration for this piece. And Kevin MacLeod's music brought the video to life!
For 3D parts, I used both curved beams and hubs (see below). Click on the image to watch the video.
Uploaded February 28, 2015
Here are the 3D printed parts I used in the video. Click on each image for details on how to make the part.