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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
Decopunk USB lampby Winged Fist
How to make mini usb air conditionerby macobt
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