This screw lid for Spicy3d's excellent 18630 battery tube replaces the tether with a tool for removing the battery cover on a Wuben X0 flashlight.
You'll need the tube and bumpers from https://www.printables.com/model/356722-18350-screw-lid-battery-holder
This is probably going to need supports no matter which way you print it. If you print it thread-side-down, you'll need supports for the underside of the grip… I suggest using PrusaSlicer's paint-on support feature so it doesn't try to support the threads.
If, instead, you print it thread-side-up, you might get away with no supports depending on the material you use. The finish on the cap won't be as good and if you use supports they'll be annoying to remove.
Pictured printed in Keene Village Plastic's Pearl Ruby Red PETG.
The author remixed this model.