Atlas 6" Lathe Spindle Nut (1"x10 tpi)

I have always wanted to have a spindle nut for my Atlas 6" lathe that would protect the spindle threads when they are not being used. A lot of lathe owners make spindle nuts as an exercise in cutting internal threads. However, I wanted to see if I could accomplish the task with my Fabricator 3D printer and Design Spark Mechanical.

The threads were laid out using the thread formulas found at https://en.wikipedia.org/wiki/Unified_Thread_Standard .
The result of the print was a nut with good a