Flashlight Stopper

This can be slipped over round flashlights (or other round things which you don't want to roll away) and prevents them from rolling away on sloped surfaces. Basically, it turns a round flashlight to a square on one end.

-- Be sure to scale it accordingly, so it fits your flashlight!! --

You want the teeth reach about 10%-20% into your flashlight's outer frame for best grip.
Mine measured at a diameter of 5.2cm.
You can see in one of the images where I measured the distances. I have to say it's a VERY tight fit. So depending on the material, you might want to measure from further inside (mine is PLA, I guess ABS is slightly more elastic).