Christmas decoration
thingiverse
To be printed in transparent PLA. Two leds, one resistor, a 9volt block cell and a switch complete the ball. The battery supplies 800 mAHr. The current through the leds is about 10mA. With 80 hours burning time it will survive christmas. Hang it in the tree and use the switch. Tilt the battery a little and push it in the ball. Glue the lid.
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