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Laser can refresh your air by kill the bad bacteria and fungus in the air.You can make a cool lamp too. All with the usb power.
cut all the blade on a pc fan,drill 4 hole on a moni dv disk and glued 4 laser
tape with black tape and let 4 hole for the air extraction,place 4 screw for making the leg of the machine
plug a switch and after take a usb cable and take the red and black wire for powering the machine
DIY Betta (or any fish) Tank with USB LED Lampby tukmol
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USB Smoke Absorbing Ashtrayby aKaMaKaVeLy
LED desk lamp using sugru, ikea nick-nacks and kitronik kitby ChickenGrylls
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