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So I live in Sydney, Australia where we can have Summer temperatures in the high 40 degrees celsius (~110 F). I have a storage shed where most of my minis are kept, it has no air conditioning but a proper high tiled roof, and no windows.

If I were to buy 3D printed minis, how much danger would they be in during Summer? Googling seems to get you opinions that they will melt in a warm breeze, or that they need to be on fire to melt. Does anyone have experience with this?

I suppose it'll depend a bit on what exact material was used to print them.....
But I'd bet 110F will be a danger to most.

For ex, I had a # of WWI/early WWII French field guns printed for one of my Historicals.
I'm not sure what they were made from, but an afternoon in a hot car trunk completely slagged the barrels. Outside temp was in the low 80sF. Not sure what the trunk temp reached. But it was enough that each gun barrel looked like it came out of a Salvadore Dali painting. :(

So is FW resin more resilient than 3D printed resin?

I have a FW giant Chaos spawn (among others) and some Mierce models and they have survived last few summers. Could that be a good measure of how 3D printed stuff would fare in there?

I'm not speaking from experience but it'll probably depend on the miniatures in question. The typical horror story from before were the big squigs where a lot of weight rested on top of a single ankle, cause the whole thing to collapse during hot days. More balanced models should be less prone to it, right?

Some 3D print resins actually require baking to fully cure such as Atlas Hercules resin
https://atlas3dss.com/product/hercules-late-pledge-and-preorder-page-hercules-ships-in-augusttabletop-ships-in-maystandard-ships-today



So for some its not even going to harm the resin at all. Of course part of the issue is that different 3D print resins are made of different components and their reaction to heat can vary.

There's also a difference between being in a hot container (like a shed) and being under a spike of sunlight reflected through glass; even though UV lightrays won't damage the resin*




*eventually all things degrade to it, but the duration for 3D printed resins is long enough that its not a practical concern)