It seems that Autodesk programs support Rhino .3dm files, which means 3dm to dwg conversion or import should be doable in AutoCAD (not AutoCAD LT). Other than that, some third party alternatives might be very well used for the same thing.
Home > Search converters: 3dm to dwg
Conversion of 3dm file format to dwg file format beta
Search for 3dm to dwg converter or software able to handle these file types.
Found 3 different conversion types using the same filename extensions.
Conversion 3dm to dwg type 1:
Convert from 3D NURBS CAD data file to AutoCAD drawing.
Microsoft Windows software 
- convert 3dm to dwg on Windows
Creo Parametric
A complete 3D modeling software solution by PTC
File extension | File type (from-> to) | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|---|
Convert from 3dm file | 3D NURBS CAD data file | No | No | No | No | No | Yes | No | No |
to dwg file | AutoCAD drawing | No | Yes | Yes | dwg editor | No | Yes | No | No |
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned 3dm to dwg. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
TurboCAD
A family of 2D/3D CAD software products for Windows
PolyTrans|CAD+DCC
A 3D CAD translation software
Revit
A building design software from Autodesk
Apple macOS / Mac OS X software 
- convert 3dm to dwg on macOS
TurboCAD for Mac
A 2D/3D CAD software for OS X
Multiplatform software 
- convert 3dm to dwg on any platform
Autodesk Fusion 360
3D CAD/CAM tool for product development
Additional links: Open 3dm file, Open dwg file
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Conversion 3dm to dwg type 2:
Convert from 3DML model to AutoCAD drawing.
Multiplatform software - convert 3dm to dwg on any platform
Autodesk Fusion 360
3D CAD/CAM tool for product development
Additional links: Open 3dm file, Open dwg file
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Conversion 3dm to dwg type 3:
Convert from QuickDraw 3D metafile to AutoCAD drawing.
Microsoft Windows software - convert 3dm to dwg on Windows
PolyTrans|CAD+DCC
A 3D CAD translation software
Additional links: Open 3dm file, Open dwg file
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