Flashlight

thingiverse

This is a straightforward flashlight that I've put together. The case was printed on the backside with support, but you can easily print it on the front side as well. You'll need to obtain several key components: six 5mm LEDs in your preferred color, one 5 Ohm resistor (I'm using two 10 Ohm resistors in parallel), and a single 18650 lithium-ion battery salvaged from an old laptop battery pack. Additionally, you'll require a TP4056 lithium-ion battery charger and a switch to complete the assembly.