Often fancy tactical flashlights will come with a mostly flat bottom so you can stand them up on their back end (tail stand). It is super useful for lighting a whole room when the power is out. Often though, they are small enough in diameter that they are easily knocked over. This file is a simple slip on adapter that makes the base wider so they don't fall over as easily.
The black looks cool, but it would be a better print in glow-in-the-dark material.
Center hole is designed to fit a 1.00" diameter flashlight. Scale as needed to fit your flashlight.
Print settings are easy, it shouldn't need supports or any special settings.