This is a replacement diffuser, for the built-in diffuser of the Nitecore LA10 Lantern.

I ended up dropping my flashlight when I knocked it off the hood of my car, and somehow shattered the diffuser. So after taking it apart and getting the right measurements, I printed it out from PLA, though i'm pretty sure if I keep in on too long, it might end up melting/softening, so I'd print it from PETG or something instead.

Fits perfectly, be careful taking apart the LA10, I ended up shredding the rubber washers.

Remove screws from the side of the flashlight, remove washer first, then unscrew the middle nut, remove clear o-ring, then twist out from top. You'll know what i'm talking about if you actually try it.