27-LED Stubby Flashlight (5mm)
thingiverse
This is a compact flashlight design that accommodates twenty-seven 5mm LEDs and features a cutout on its underside for a 12mm size pushbutton switch. The LED and switch mounts are detachable and secured by multiple small screws. You'll need to determine how much voltage you plan to use and choose the suitable resistor(s) for your LEDs. UPDATE: I've added a three-switch bottom plate for users of RGB LEDs or similar types, as well as an extension that can be printed if you want to extend the length of your flashlight (simply attach it to the main body using glue).
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