This is a model I've used for a good while now, I wanted to give it a good amount of testing before I posted it. For being made out of plastic it has done a fantastic job. Let me preface that  I do not fire my riffle an awful amount so I haven't gotten it up to a failing temp.

The one I made is made out of pla+ and I haven't had any issues but I don't think it would hurt to make it out of PETG, but the pla has done fine. Id recommend making it mostly solid, no support needed. The tpu part needs to be glued on, it catches the ribs of the flashlight helping it to not slide around to much.

I'm currently redesigning it to have a rubber band mount so you can strap it down for extra retention, but this one does fine. Let me know if you print it for other lights and I will add it to the list of lights it fits! Feel free to dm me with any questions.