Also look at Tetra4D Support for further details about Acrobat Pro. They also sell a convertor that can export from 3D PDF to common CAD formats, limited by the original conversion into 3D PDF. Tetra4D is related to Tech Soft 3D and is now the company Adobe depends on. Tetra4D Products
Also look at Adobe Acrobat Help | Acrobat Help under Multimedia and 3D models:
Setting 3D views in PDFs https://helpx.adobe.com/acrobat/using/setting-3d-views-pdfs.html
Interacting with 3D models Acrobat Help | Interacting with 3D models
Displaying 3D models in PDFs https://helpx.adobe.com/acrobat/using/displaying-3d-models-pdfs.html
Measuring 3D objects in PDFs
Commenting on 3D designs in PDFs
Playing video, audio, and multimedia formats in PDFs
(Too bad - if they won't buy the tools, they must not want the job done.)