Streamlight 2AA Vertical Stand

The Streamlight ProTac 2AA (like most Streamlight flashlights) won't stand on its tailcap because the rubber switch cover sticks out too far. This is a small print that slips over the back of the flashlight, and allows it to stand on end.

The inside diameter needs to end up at 20.10-20.15mm to provide a tight fit to the flashlight; I set it to 20.3mm to compensate for slight overextrusion on my printer, which results in walls that are a little thicker than they should be.