There are plenty of flashlights on the market today, but if none of those tickles your fancy, you can make your own flashlight just as instructables user macskyver did.
Using a CREE XM-L LED the flashlight is powered by 3 D-cell batteries, but if you would like a higher power flashlight you can add extra segment in the mid of the body to make it a 4+ battery light. macskyver fabricated most of parts using a 3D printer, the only problem is the battery life - "battery life might just be a bit lacking... and the light output may be a bit inconsistent from beginning to end of battery life. " Nevertheless, this home-made flashlight works and it is powerful.
Building a home-made flashlight is cheap and simple if you can handle a soldering iron and drill, and of course a 3D printer. Luckily macskyver has uploaded very detailed step-by-step instructions and tips. Check them here to see how to build up this flashlight from scratch.
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