> How I make to import the files dxf?

Currently you'll have to use a different program to translate the .dxf file into either a .3dm or .igs file.

You might take a look at PolyTrans or Rhino for doing this.

At some point in the future it will probably be possible to directly import dxf and dwg data, but probably not for the initial V1 release.

What program are you using to create the dxf file?

- Michael