https://forums.autodesk.com/t5/maya-modeling/exporting-maya-nurbs-to-iges-file-and-open-in-rhino-but-all-in/td-p/7409091

Which version of Maya?
link talks of update 4 for Maya 2017?

- Brian

I guess one other possible thing is maybe you have to be in some kind of particular selection mode with the curves selected when you do the Maya export?

- Michael

Thanks for the replies, so I've figured it out. In maya's plugin manager you have to turn on iges.mll and in the export select IGESExport with the curves selected in object mode. The issue I was having is that without turning on that plugin, maya already provides you and IGES export option but its called IGES_ATF Export. The windows explorer refers to both as IGES files but the one that works is .iges while the other is just .igs

Hi Austin, that's kind of tricky to get it to work! I'm glad you have it solved now and thanks for posting how to do it.

- Michael

Hi Austin,
Which version of Maya are you using?
- Brian