Have you ever built a bunch of LED throwies for a project and then lamented when they all died out before you had the chance to integrate them into a project? Well! This LED throwie uses a magnetic reed switch to save energy by only turning on the LED once the throwie comes into contact with a magnet stuck to a metal surface. The LED switching circuit consists of a ultra bright LED with the positive lead (longer lead) connected to a magnetic reed switch and the positive side of a 3v lithium button battery. The negative lead of the LED is connected directly to ground.The enclosure itself was built on a Makerbot Thingomatic and was coded in OpenSCAD.Adjust the OpenSCAD code to include the exact sizes of your individual batteries or LEDs (Don't worry, the code's commented)Print twice! Wire up LEDs and switch to button battery and glue to the inside of one of the throwie halves.