Models saved in the 3D NURBS CAD format (.3dm file) can be most likely exported and converted to other 3D model data files, including DAE format (Collada 3D Digital Asset). Viable options for 3dm to dae conversion are for example some of dedicated 3D model / CAD translation software or even some modeling programs with broad file support.
Open 3DM file Open DAE fileA CAD 3D geometry translation software
A converter for 3D formats
An online CAD conversion service
A commercial online CAD converter
A 3D CAD translation software