With Autodesk Revit MEP 2016 you can now create fabrication ready models directly within Revit using Fabrication Parts (ITM Content).
The model data can then be exported using Autodesk Exchange Apps Revit Extension for Fabrication as a .MAJ file, ready to be opened in Autodesk Fabrication CAMduct (for manufacturers), ESTmep (for estimators) or CADmep (for detailers).
For example in Autodesk Fabrication CAMduct to create a nested sheet for CNC parts fabrication, giving a greater MEP fabrication detailing workflow from Autodesk Revit MEP 2016.
The Revit Extension for Fabrication App available to download from Autodesk Exchange Apps. https://apps.exchange.autodesk.com/en
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