Light diffuser for Fenix E05R, designed in Tinkercad. Enjoy! The diameter of the flashlight is 15mm, but from my experiments I found that best size for the cap is when it's 16mm and has 16 sides (not 12, not 20, not 24, not 32 :D)

I've printed mine using white PLA at 0.12 layer height. Border width doesn't seem to make difference, as most of light goes through holes.