It would be better to print it horizontally, but in case of a screw, you can only print it with PVA, which makes no sense.
I am not sure, but I think there is a difference if you say 100% infill, or increase the wall count to a high number that you also get 100% infill. The pattern is different because then only walls are printed. Give it a try.
Hello @aag, I would say 100% infill, solid, not gradual. Also, print as hot as you can while still obtaining good definition.
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