Just how big is this model anyway? Approx LxWxH?
I’d wager that both or either of you could cheat this infill issue and still keep the weight down if you were to use a tighter infill of PLA Aero on the upper layers. That is, assuming you have an AMS to offload most of the logistics of all the filament swaps required to accomplish it. 
Edit: Come to think of it, I’m not sure that PLA Aero is AMS compatible. 
If that’s the case, maybe there exists some other low density filament that could serve the purpose?
If push came to shove you could maybe use a dissolvable filament like PVA to serve as the support.
Yeah, how about that?
At 100% scale for the print, it’s 36 inches long.
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Wow, what a project! Must have taken ages to print.
FWIW, I notice that their print appears to have the same issue as yours, but far worse!
One of the reasons is their paint job. The tint went into the cracks, making them appear darker, and thereby effectively exaggerating the lines even more. If only you could paint it in camo… Space camo, of course.
I suspect that was printed at 0.2mm. I’m reprinting the first few pieces I did at 0.12 with the variable layer height down to 0.08mm.
For the smaller more details parts, I bought a 0.2mm nozzle which just arrived today.
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I’m noticing something else that’s unusual about the way this printed. There are all these little “plates”, but they are all kinda blobby on their north end, but on the opposing side there’s none of that.
At least in what I typically see, there’s generally symmetry. Yet, not here. Why is there nothing showing like that on the bottom (south) side of it? Were they cut from a larger piece and then glued on, or did they print in place like that?
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Would this not just be from the angle? Remember, this is not actually a top, it’s an angled part top and part side.
Maybe so. If it looks normal to you, then scratch what I said.
I’ll be very interested to see how your 0.2mm nozzle print comes out!
I just now noticed a new beta feature in orca slicer that may directly address your title concern about pillowing.
Have a look into the in-line help description for “Don’t filter out small internal bridges (beta)”:
@sorka95032 Any updates? Were you ever able to resolve your issue?