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Spotted in the MAKE Flickr pool, from Sascha Grant:

I purchased a 405nm laser diode…off ebay just recently and needed a case to mount it in. So I have turned this from a length of aluminium tube for the body and two pieces of aluminium bar for the front and back closures. The front closure doubles as a heat-sink. Everything’s held together with grub-screws. Runs off two AAA batteries which just fit inside.

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