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This diffuser for the D4SV2 is designed to radially distribute light into a useful area. Unlike other types of simple flashlight diffusers, this design uses aluminum foil glued to the top to prevent light from going off into the sky.

No supports required!

There is some assembly required; take a look at the assembly guide in the photos. Note that this is copied from my D4V2 post, but the assembly process is the same.

I print these out of PETG using a 0.4mm nozzle with 0.2mm layer height on a Prusa I3 Mk3. 

I have never melted a diffuser onto my light even while running on turbo, but your results may vary! I do not take responsibility for any melting of these diffusers!