Keep Inventor Solids Simple (KISS) when exporting.
This new & free technology preview for Autodesk Inventor 2013 named Inventor Simplification has just been posted on Autodesk Labs allowing you to reduce models, include or exclude parts and remove IP before exporting for use in a Revit BIM model using the .adsk file format. In the past there has been the shrink wrap feature but that has now been expanded with more abilities to control what is exported.
For example you may have a large assembly of a elevator (a lift for my friends outside the US) and do not need to send the new elevator mechanical design to be used the in Revit model the architect is building. You could shrink-wrap, fill holes, and export only the minimum parts required of the elevator in the Revit model. You could also be exporting a crane or cooling tower design for use in a large Revit BIM model as seen below. For a BIM model all the gears, motors and other contents inside a crane.
If you are exporting your mechanical designs for use in BIM models you should definitely check this technology preview out.You can also export out the models as DWG or SAT for use in other applications.
Inventor Simplification for Autodesk Inventor 2013