Help needed with support structures

Ok, so you’re saying: Leave it for now at 100% extrusion and get back later?! I saw no difference between 87% and 100%, both were 0.45 mm wall thickness.
I’m just on the way trying to auto calibrate with aluminum foil. Hope this works. What would be the best value for the last (manual) setting of Z. I do have a thickness gauge as I’m not getting familiar with this paper card. I read somewhere 0.05 mm, another value was 0.09 mm and even 0.1 mm???

Yes, leave it at 100% extrusion unless you have to change it. If the filament diameter changes just update that and S3D will do the math for you (save you from having to find the ratio of the squares of the radii).

Z height should be 0.1mm, which is approximately the thickness of a piece of paper or the calibration card. Adjust as needed based on first layer print quality, which is the only thing that matters really and overrules all numbers (.05 or .15 is fine if that gives you the best quality).

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