Electronics > Beginners
Integrating simple electronics in to 3d pen made stuff.
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Vanity Smurf:
would tearing down and using the internals from things like https://www.amazon.co.uk/Bright-White-Keyring-Torch-Black/dp/B0050HPACG/ref=sr_1_8?ie=UTF8&qid=1535045262&sr=8-8&keywords=led+keyring  work.
CJay:
That's pretty much the exact type of thing I mentioned, if you get one you'll find there's nothing in there but a coin cell and the LED.
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