stl file has already been tested but get the same confusions. and sld file as well. i ve also tested the custom support which still generate support though the bottle wall.so i m so confused if its a bug of cura. To get more testing ,i ve also tried Z-suite of Zortrax since i got one M200 printers.In Z-suite,custom edge support may generate proper support if point on the "edge" of the bottle neck but get the same as Cura did if point on closer surface of the neck.i wonder if i had explained correctly for my poor english.
i have installed the mesh tools also. it warned that the model isnt watertight. But it seems that its not the major case that cause my problem.
if needed i can attach stl file.