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Either you are using a LED that needs less voltage then the battery provides like yellow/red/orange LEDs (+-1.8V) Or you are using a battery that provides more than 3V? You could solve it by adding a resistor. If you want to read more about LEDs: https://www.instructables.com/id/LEDs-for-Beginners/
Light 'em up: turn any 3D p...View Instructable »
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