Full Tutorial on Adafruit Learning System https://learn.adafruit.com/case-for-circuit-playground/3d-printing
3D Printed Case Are you looking for a way to protect your shiny new Circuit Playground? A 3D printed case can make it easy to keep your board safe and sound. You can mount the case to anything and embed it into other objects for quick projects.
The Shapes Edition This is a series of 3D printed cases designed to house a Circuit Playground, battery and switch. Three different shapes can be used for different applications. The board appears recessed allowing the NeoPixels to have a wider spread of light.
Circuit Playground Classic https://www.adafruit.com/product/3000
Circuit Playground Express https://www.adafruit.com/product/3333