Thanks Pete! Having to convert the lines into splines prior to creating a surface is an added step, but it does work great. Thanks for the help, much appreciated!

Let me add, what I'm trying to do is have a surface in Solidworks. If I could bring the native file into Solidworks and quickly create the lofted surface, that would be even better. I've just never found a way to do that in Solidworks, quickly. So the file from Mastercam to Solidworks can be anything, it doesn't have to be an .iges. (And I'm not some bandwagon 'Hawks fan, I've had season tickets since way back when they suuuuuucked!)

Thanks Pete, it's weird because in X7 I have it set as NURBS and it makes 1 surface instantly. In 2017, it creates a ton of tall, skinny surfaces due to all the data points. But the native .iges file opened in both versions start as 4000 lines in the point cloud.

Thanks Pete for the reply. Attached is the MC file with the lofted surface created. I'd love to pick the just the surface and "Save Some" as an .iges file. Ugh. Crash.mcam

I'm new to Mastercam 2017 (upgraded from X7), and I'm trying to create a lofted surface with multiple curves using the window option for my chains. The files are cranial scans that get saved as .iges files with curves consisting of lines that from a head (see image). In X7, I'd easily click lofted surface, select the window of all the curves, select a starting point and the surface was created instantly. In Mcam 2017, when I match the surface configuration settings as X7 it takes forever and creates thousands of surfaces that wrap from top to bottom. When I change the setting from NURBS to a curve generated surface, the single surface is created similar to X7. The problem is I need to re-save the file as an .iges and 2017 crashes every time when it's curve generated. When it creates the thousands of surfaces (NURBS setting) I can save as .iges no problem. My goal is to quickly create the SINGLE surface, and re-save just the surface as the new .iges file. Any help would be greatly appreciated!!