deonb wrote: ...
Ok, but this is again one of those cases where Cura does the correct thing - it bridges the sides before starting to print the outline of the hole. It can do this part without any supports required (repeatedly so).
If Simplify3D just started printing the outline of that hole over a side instead of in mid-air it would already work better.
About this I'm not very sure!
I had to print today a small cylinder with a hole in the bottom for a nut.
For testing your statement I have turned the bottom of the cylinder to top. You are right, S3D does print the (new) top layers in the plain air. Without support it is not possible to print this object as Doug has written.
But Cura (the last red pic, importe Cura-GCode in S3D) has an other very grave fault - it forgets to print the complete hole and fills up the space with infill. That cannot be the solution.