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Support structure offset

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Can anyone point out which setting makes the support being built outside geometry when using PVA?


If I set extruder 2 to PLA it looks like second pic.


First pic is PLA + PVA (purple)



Second is PLA both (Brim is PVA):



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I guess it is to prevent creating lots of small "islands" of support on some prints. Since PVA does not stick very well to PLA, these would have a larger chance of tipping over. And it should not do much harm because it will dissolve anyway.

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