This is a 3D printed double pendulum (https://en.wikipedia.org/wiki/Double_pendulum). This project was inspired by a similar project that can be found in Make Magazine Volume 22 (http://www.makershed.com/products/make-volume-22).

Parts Required
6 Bearings- 5x16x5 625zz bearings
M5 Rod or M5 Screws. Three shaft lengths are required 35mm, 25mm and 16mm
2x M3x25 screws and nuts
Optional Electronics
2x 3mm LEDs
2x CR2032 batteries
2x SPDT slide switches (https://solarbotics.com/product/swt1/)

The bearings should be pressed into each part using a soft faced hammer

A C-clamp or similar clamp will be needed to fasten the pendulum to a table.