Genesis Poi: DotStar LED Persistence-of-Vision using Adafruit Trinket + soda bottle preforms
3D printed components to accompany a DIY electronics project on the Adafruit Learning System:
https://learn.adafruit.com/genesis-poi-dotstar-led-persistence-of-vision-poi
See guide for the complete parts list.
Poi spinning by Firepixie: http://www.thingiverse.com/Firepixie