This is a minimalist LED flashlight. Assembly requires - in addition to the two printed parts - a 5mm LED (white or any other color), a 20mm watch battery (I used a CR2032) and a small piece of electrical tape. One of the LED leads is positioned under the battery, the other stays on top. The flexibility of the top lead together with a small piece of electrical tape is used to make a simple switch.
The lid should be a tight fit and stay in place without any glue.