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The following settings are recommended up to SolidWorks 2016 and I-DEAS 12 NX Series.

SolidWorks – System

SolidWorks - STEP Preprocessor

To export a STEP file choose File -> Save as..., as file type choose STEP-Format (step, stp) and go to Options. A new dialog box appears.
Under Output as the following options can be selected:
Solid/Surface geometry: the geometry will be exported as solid and surface bodies. This is the recommended option.
3D curves: solid and surface bodies will be exported as wireframe entities and all 3D curves are also saved.
Export sketch entities: export all the items in 3D curves, plus all 2D and 3D sketches in the document.
Output coordinate system: by selecting default, no transformation matrix will be applied.
Export face/edge properties: Exports face and edge properties. Clear this option to improve export performance.
Split periodic faces: Splits periodic faces, such as cylindrical faces, into two. Splitting a periodic face can improve the quality of the export but can affect performance.

STEP File

STEP files using either version (CD or DIS) can be imported.
The STEP filename including path should not exceed 41 Characters.
The STEP filename should not contain: equal sign (=), colon (:), semicolon (;), asterisk (*), question mark (?), quotation marks (""), or comma(,);
There must be no spaces in the STEP filename.
The extension *.step of the STEP files must be renamed to *.stp.

I-DEAS NX - STEP Postprocessor

Save reminder (Options/Preferences/Data Management/ Save reminder every) should be turned off since the translator stops for every alike message.
In Menu STEP Export Settings AP214 several options for the used units of functionality can be set.
A change of the default options is only necessary in case of unsuccessful results.
If the import was successful, you will get a confirmation message.
Two logfiles are generated (filename.ipr and stepoi.ipr):
filename.ipr includes the import settings
stepoi.ipr includes an import log
The log files are written in the same directory as the STEP file.

I-DEAS NX - System

A part is automatically generated from the filename on import.
If the part name duplicates an existing part name, the part is renamed "Duplicate Part Name X", where X is a sequential number (X=0 for the first duplicate).
On each import, a new part is created even if the parts are identical. Therefore, the part names must be different.
Shaded view gives hints about possible defects.
Use the Automatic Stitch-mechanism for information about open gaps and remaining free edges. It is found in Master Surfacing Module in Menu Surface Operators.
If free edges are found in solid models, the Automatic Stitch-mechanism can be applied to merge free edges by changing default accuracy. For surface models, the edges that build the contour of the model remain free edges.

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