Hi there, I just found this discussion, tried it last night on a small functional part I make, and for me the petg works a lot better than the Bambu support filament, on my X1C, settings almost exactly as above. I have been struggling with the under side of my parts that need support being quite ugly for a long time. The area is mostly covered by a screw so not a huge deal.
And now because of this technique it’s 95% improved! Nice!
But now I am questioning my decision to order the A1 mini w/o the AMS. I was thinking of using that to run my common pla parts, and save on wear and tear on the X1C…