Hi Tuli,
Export to dxf or stp files is not supported from MATLAB .But there is stlwrite function in MATLAB which you can leverage to export geomerty to '.stl' files. It is a widely used file format and it can be imported into any CAD tool and then saved from there as a '.stp' or '.dxf' file.
For more information on writing to stl files , you can refer to following resources:
Hope this is helpful.
