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Thanks for the advice. Do you have any idea what is going on with my supports (please see the picture)? I have seen this before but I have no idea what causes it - oh, and the model itself is just fine and I am printing it quite slow at 30 and 18 mm/s.

As for the internal supports inside the NOZZLE: I stated that the supports must be at least 1,5 mm far from the nearest wall in the X/Y directions and I put an overhang of 80° - that way it only generates supports where the overhang is 90° dead on - that means in the middle of the model and on the very outside. It will not create supports in the hollow part. But I am using Cura 4.0.