How to create .stl file?

How to make .stl file using AutoCAD?

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Click Output tab - Send panel -Export.

In the Export Data dialog box, enter a file name.

Under Files of Type, select Lithography (*.stl). Click Save.

Select one or more solid objects. All objects must be entirely within the
positive XYZ octant of the world coordinate system (WCS). That is, their X, Y, and Z coordinates must be greater than zero.

The file extension .stl is automatically appended to the file name.

 
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If you still want a fine (smooth) surface then type FACETRES in command line Y enter value between .5 to 10.By entering 10 you will see a very fine surface.

 
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