Convert NRRD / DICOM to 3d-mesh (.stl file)

I am looking for someone who can convert a NRRD / DICOM to 3d-mesh (.stl file) I need the .stl file for printing it in a 3D printer.
The object is a violin body, 360mm long, 210mm width. DICOM file size is 333 MB -
I found a program to slice this violin to three parts (those parts will be 3D-printed seperately), and to convert these parts into a .nrrd file. These three .nrrd file are about 60 MB each.

The task is: rendering the three .nrrd or the single DICOM file to .stl, preparing and cleaning the inside and the outside surface. The violin has an inner and outer surface, there is no need for hollowing the object.
If you use the DICOM file you need to cut the violin in two halfs lengthwise, cutting the neck, fingerboard, strings, tailpiece and bridge off and make three .stl files out of it. TOP of violin - BACK of violin - HEAD of violin.
The finished .stl files should be prepared so that they can be printed out as a 3D model.

I was able to have a look at the dicom files - there seem to be no major artefacts from metal parts, the pictures seem to be free from chaotic errors.

Any suggestions? Who can do the conversion? estimate?
I would appreciate an estimate as a fixed sum for conversion plus extra work cleaning up the files on hourly base.