Can not get makerbot to print threads

I am using Autodesk Inventor and when I build a part with threads, I can not get it to print the threads. The threads don't even show up when I add the file to the Maker Ware software. I am assuming that I am missing a step in sending it from Inventor to Maker Ware, but not sure.

Thanks

The fault lies not in your stars, but in your Autodesk Inventor (sorry, Shakespeare). I've tried the same thing, and been unable to get Inventor to generate a model of threads. Everything is symbolic. Perhaps with Autodesk moving into 3D printing we will see a change here.