There are many flashlight lantern diffuser adapters out there but none were just right.  Here are some of the features of this model:

Base to keep the flashlight from falling over. 
Base has a hole so you can access the on/off switch without removal.
Light cone is longer than many others, helps to diffuse more light.
Base tucks inside the cone for storage.
Base tucked inside cone reinforces cone during storage/travel.
Base has cut out for to allow room for belt clip.

I've uploaded a few different size cones/bases with more to come.  You can change the scale before you print to make it fit your light but you will probably lose the base into cone storage.

As someone who has to use flashlights daily in a hard environment, the Fenix flashlight I designed it around is one of the best.  Check it for yourself here:
[https://amzn.to/35HIYTi](https://amzn.to/35HIYTi)

Let me know how it works for you in the comments, lets see those builds!