analysis of an existing solid to be printed in 3d

the job is the study of an existing solid inside which the solid proposed would be derived as much space as possible, consistent with existing printing technologies 3d At the end of the work will have to be produced. STL file of all parts of the solid plus three file with the solid to complete the printing in 3d. You will also need to produce a file dwg consitente in all components forming part of the 'object