Cura settings for hollow print?

Salivations!

I’m trying to print an object that is basically a long tube. I want it to be hollow at both ends, allowing me to pass wiring thru it. But I can not figure out how to set cure so that it does not print solid ends.

The tube is very narrow, only 4mm in diameter. It has a flat bottom.

It looks fine in Cura, but no matter what I change, still prints with solid ends.
Screen Shot 2016-04-19 at 2.58.42 PM.png
Any help is appreciated. Thanks!

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Hi JEBariffic

my first thought would be that you have made it in the model wrong.
I am almost sure you can see in your CAD already that the ends are solid.

You need to fix it there and then it will be fine in Cura

All the Best
Frank