basically this is the same nut as here http://www.thingiverse.com/make:186226
I am designing a printer from scratch so because of customisation i needed the nut in some solid format, but it was next to impossible to find it.
Following the instructions from link above i managed to make it in OpenScad. Then exported it to .CSG. Downloaded and imported it in FreeCad. exported from there to STEP but whatever i did it did not work properly, tens of thousands of small bodies.
At the end exported in IGES and imported in NX using "simplify" and "sew bodies" and "repair". It worked.
Now is easy to use it for your project and customize it. Thanks to the guys with the original concept.
PS. Just added the 2 start version also, so Bang good motors with screws are covered.