Thank you for the quick reply.
Eventhough I have used "Print thin walls" and reducing line width, the problem (as shown in preview mode (does it show the printing result correctly?)) was still occuring.
The three parts makes single model which I intend to join. I have sliced the part more far from the perforation and it works good.
I guess your model is too thin at this area and therefore it will not sliced by Cura.
You have two options, use a smaller nozzle to reduce the line width, reduce the line width with your current nozzle or use the experimental setting "Print thin walls".
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