Summary

https://www.youtube.com/watch?v=l0AmRR9w0nw

Build a sci-fi inspired bike light using Adafruit Feather and NeoPixels. Use an RGB LED Button to cycle through different colors and animations. The button will actually match the colors of the NeoPixels! The headlight fixture was inspired by rocket boosters and jet engines. I had the idea of an illuminated edge band that wraps around a cylinder with an illuminated inner core. By combining black PLA and translucent PLA, you can mask out certain geometry while illuminating other elements. I've been meaning to design specifically for dual extrusion such as the Ultimaker 3 and this is what I came up with. 

Code, Build Instructions, and Source Files:
https://learn.adafruit.com/neopixel-headlight/

Adafruit Feather M4 Express
https://www.adafruit.com/product/3857

24 NeoPixel Ring
https://www.adafruit.com/product/1586

7 NeoPixel Jewel
https://www.adafruit.com/product/2226

2200mAh 3.7V Battery
https://www.adafruit.com/product/1781

Toggle Switch
https://www.adafruit.com/product/3221

RGB LED Metal Button
https://www.adafruit.com/product/3350

3D Parts Library on GitHub
https://github.com/adafruit/Adafruit_CAD_Parts