To Export a Part or Assembly Model as a 3MF File
1. In an active part or assembly, click > 
Save As > Save a Copy. The Save a Copy dialog box opens.
Save As > Save a Copy. The Save a Copy dialog box opens.2. Select 3MF (*.3mf) in the Type box.
3. Accept the default name or type a new model name in File name.
4. Click OK to export the part or assembly model using the default export profile options or click Options to customize the export settings in the 3MF Export Profile Settings profile editor.
5. If you selected Options, customize the export settings in the 3MF Export Profile Settings profile editor or click Load Profile to load and use an existing export profile with options specific to the 3MF format.
6. Click OK in the 3MF Export Profile Settings profile editor.
7. To set additional export options, select the Customize Export check box before you click OK in the Save a Copy dialog box. The Export 3MF dialog box opens.
8. Change the values of the following Deviation control options for the additional control of tessellation:
◦ Chord height
—Controls the distance between a chord and a surface while tessellating the model surface.
◦ Angle control—Regulates the additional improvement of the curves with small radii after tessellation.
◦ Step size—Controls the aspect ratio, size, shape, and the quality of the triangles while exporting facet geometry.
 | The values that you specify for Chord height, Angle control, and Step size are stored as the Most Recently Used (MRU) values. |
9. Select the following options for assembly models:
◦ Use proportional chord heights—Sets the maximum chord height proportional to the size of each component.
◦ Use proportional step sizes—Sets the maximum step size proportional to the size of each component. Use this option with Step Size.
10. Type the name of the file without the extension or accept the default name in File name.
11. Click Apply and click OK to export the model and close the dialog box.