Flashlights have many parts, and to understand how a flashlight works you will need to know what it is composed of, and how those parts work. A Flashlight is comprised of three main things: you...

Instead we decided to 3-D print our shell (outer part), because with the two bulb design, a normal flashlight shell wouldn't allow us to fit everything. Finally, we take the wire that is attached to the battery holder (the side that has a bump), and we solder that wire to the other side of the diode that has the resistor attached to it.