I-DEAS models (.mf1) can most likely be converted to plenty of other 3D modeling formats, including 3DM format (3D NURBS) format for 3D printing. You can use one of the several available converters for this mf1 to 3dm conversion, some good picks are listed below.
Convert I-DEAS model file to 3D NURBS CAD file.
We found one software available in the database for this conversion.
On-line services software - convert mf1 to 3dm on web
An online CAD conversion service
Convert from mf1 file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.