I made this a suggestion during beta phase of "arro" (now SimStudio).
Since SimStudio doesn't support 3D lines that one can export as IGES to consider them as
cooling lines in MF after meshing...
I would like to see something like here:
http://www.youtube.com/watch?v=QukF4VCj9xo
It's from a competitor named VISI - and it shows the extraction of cooling lines from 3D to 2d (or 3D lines).
It would not be to hard: Extracting could be done in SimStudio (it's still harder to use in that regard than Spaceclaim btw.).
The extraction of cooling lines could happen in MF 2016 - since the 3D extraction could be moved on a special layer.
All geometry on that layer is examined and connected 3D lines are made out of it - ready to mesh.
Alternativ a 3D line option to follow cylindrical shapes and draw lines in their centers should be possible in SimStudio (I know
thi is the Moldflow Idea Station, - but there's nothing for SimStudio?)
If cooling is possible, than for runner (cold runner) geometry it would / or should be possible, too.
Regards
Harald