I have a part which has some air passages in it, they are .07" in diameter and run the profile of the part. See wire-frame attached. O am using Simplify3D, and have adjusted settings as to ignore this small of a space, and the wire-frame with infill on the preview is not showing the tubes being filled in. Any suggestions?

Screenshot - 15_05_07 , 11_47_21 PM.jpg

Also check the item out on Thingverse at http://www.thingiverse.com/thing:813434