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Importing DXF Files
File menu > Import > Select File To Import dialog > Files Of Type > AutoCAD (*.DXF)
DXF files are used to import and export objects to and from AutoCAD (and other programs that support this file format). Keep the following in mind when you are creating your DXF geometry, and when you are deciding whether to convert by layer, color, or entity:

• With AutoCAD Release 12, if you're using the AutoCAD Advanced Modeling Extension (AME), use the SOLMESH command on your AME models prior to saving the .dxf file.
• With AutoCAD Release 13, you can use the 3DSOUT command to convert an AutoCAD drawing to mesh objects. This command creates a 3D Studio R4 (DOS) file that you can import into 3ds max.
• After importing a DXF file, you might want to divide the resulting 3ds max objects into smaller objects.
• Entities that are frozen or turned off are ignored.

The successful unification of face normals depends on the welding of coincident vertices. Sometimes, depending upon the precision of the model as it was created in AutoCAD, the vertices may not be close enough to be considered "coincident." They will not be welded, and the faces will not be properly unified. In this case, increase the Weld Threshold value in the Import DXF File dialog. Irrelevant info (General model category of electronics machinery tools, Computers hardware printers monitors keyboards,)

Converting by layer can result in objects consisting of many elements. In certain cases, some of these elements may have all of their face normals flipped the wrong way. You can detect this in 3ds max by turning off Backface Cull in the Display panel or by rendering the objects. Use the Normal modifier to correct this.If you do not want to flip normals, you can either use 2-sided materials, or turn on the Force 2-Sided option in the Render Scene dialog. If you are loading a large scene containing thousands of entities (such as 3D faces) and have chosen to load an object by entity, the conversion can take a long time. It also produces a huge number of objects to handle in 3ds max. To avoid this, organize your DXF file so that these kinds of entities are grouped by layer, then make the conversion by layer rather than by entity.

Derive Objects From—Determines how components in the .dxf file are to be converted into objects.
Layer—Each layer with a unique name is converted into a separate object.
Color—All entities of the same color are converted into a single entity.
Entity—Each entity is converted into a separate object.
Weld Vertices—Welds coincident vertices in the .dxf file into single vertices in the 3ds max mesh.
Weld Threshold—Determines the size of the area which vertices must occupy to be welded.
Weld—Turns on the Weld Vertices function. In most cases, you should leave this box turned on because unwelded objects can't be correctly unified or smoothed.
Auto-Smooth—Applies smoothing groups to the geometry based on the smoothing angle set by the smooth angle spinner. Edges between faces that have an angle between them that is greater than the specified smoothing angle will appear faceted in the rendered image. Edges between faces that are below the specified angle are smoothed.
Smooth Angle—Determines the size of the smoothing angle.
Auto-Smooth—Turns on the Auto-Smooth function.

Exporting to DXF
File menu > Export > Select File To Export dialog > Save As Type > AutoCAD (*.DXF)
DXF files are used to import and export objects to and from AutoCAD (and other programs that support this file format). Note: The DXF Exporter can export only mesh data. Therefore, all shapes and splines are exported as mesh objects. Consequently, any open splines (which cannot be converted to mesh objects) in your scene will not be exported.

Save to Layers group
- By Object—Each object with a unique name is converted into a separate layer.
- By Material—Each object with a unique material is converted into a separate layer.
- 1 Layer—All objects are exported as a single layer.