Print in your translucent filament of choice. I would not use the higher power settings on the flashlight if you are printing in PLA as the flashlight does get hot enough to deform standard PLA at those settings. the pictured prints were done on .4 nozzle at .32 layer height with line width of .5.

I have confirmed this fits Fenix models E30R and LD30 it's possible it will fit other Fenix flashlights as well with similar end dimensions as these two. 

update: added cube version