I had a bit of a problem with this print at first:
Since my printer isn't supported by Cura, I used the Flashprint software and in the preview mode the neck was pretty screwed up, there were multiple layers missing. Same thing happened in Slic3r.
To fix it, I opened the stl in Meshmixer and on analysis - inspector it showed some problems, specifically with the neck. I clicked on auto repair all and exported the stl again. Afterwards the preview looked perfectly fine :)
I'm guessing Cura does this auto repair automatically, so if you use any other software, make sure to repair the model first.