Can PETG this materials be used outdoor, as lampshade? instead of PC materials. I think that is a better idea, but the use of PETG is rarely seen outdoors. please give me some suggestions, so many thanks.

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In my experience PETG can be used outdoors without problem.

I am actually right now printing a small series of parts in black PETG that are going to be used in a marine buoy.

PETG does this at least as well as ABS in my experience. ABS generally can withstand a bit higher temperatures, but for many applications PET(G) works just as well. And if the parts are think or small, PETG often performs better because it has a little better layer adhesion.