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The following settings are recommended up to NX 11 and AutoCAD 2017/Mechanical Desktop 2017

NX – System

Delete blanked elements before preprocessing.
To transfer colors of assemblies the colors should be set and saved with the individual components, not the assembly.
Note that NX uses the radius of a "tolerance tube", other CAD Systems like CATIA V4 define "tolerance" as the distance between two points.
Select Analysis -> Examine Geometry -> all options -> all elements (up to NX2).
Select Analysis -> examine Geometry -> Set All Checks (up to NX8.5) The marked elements are likely to cause problems with data exchange, depending on the messages as explained below:
Severe errors:
data structures, consistency, face-face intersections, self-intersections
Might cause problems:
tiny, face smoothness, spikes/cuts, edge tolerances
Without negative influence on data exchange:
misaligned, sheet boundaries, edge smoothness

NX - STEP Preprocessor

Start the external STEP processor with File -> Export -> STEP214.
Select Data to Export and define the options:
Object Types: One or more of the options Solid, Product Data, Surface, and Wireframe (depending on model).
The default tolerance value in menu Advanced -> Parameters -> B-Spline Aprx. Tol. of 1.01*10-5 mm can cause to very large STEP files and should be reduced in such cases(recommended value: 10-3 mm).
Recommended is to use the default settings in menu Translation Control (Tolerant Modeling).
Special characters in the filename of the STEP file are not allowed. The model will not be exported.
Validation properties are supported.

STEP File

AutoCAD/MDT - STEP Postprocessor

To import a STEP File you can choose Insert -> STEP... or the STEPIN in the command line.
Sub-elements of objects cannot be colored individually in the system.
Importing a product with multiple bodies, an assembly is created.
The import log file "filename.xli" gives further information.

AutoCAD/MDT – System