LED Throwie Ball

I got this idea when Daniel Spangler, one of our Make Labs interns, finished building a DIY trebuchet kit at 10PM and wanted to launch stuff with it. He taped LEDs and a coin cell battery onto a tennis ball so that we could see where it would fly in the dark.

I thought it looked just a bit janky, so I came up with the idea of encasing the LEDs and battery into a transparent plastic ball. I modeled it in AutoCAD, printed it on our Thing-O-Matic 3D printer, inserted the LED and battery, and beh