Parametric power-saving throwie enclosure
thingiverse
Avoid wasting energy by using a magnetic reed switch in this LED throwie. It only turns on when the throwie comes into contact with a magnet attached to a metal surface. The LED is connected to the reed switch and a 3V lithium button battery. Its enclosure, coded in OpenSCAD, was printed using a Makerbot Thingomatic. Personalize the OpenSCAD code for your specific battery or LED sizes; print twice. Assemble by wiring the LEDs and switch to the battery, gluing them inside one throwie half. Finally, stick both halves together with superglue and attach to magnetic surfaces.
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