I have been refining a workflow for converting architectural revit models to 3d printable files. The following assumes a reasonable level of ability in both Revit and Rhino.
In Revit set up a 3d view and hide elements that you don’t want to print. You need to carefully consider the scale and thickness of elements that the printer can achieve. For example a 1:500 model is unlikely to print railings and window details with so hide them in revit where you have the most control over the geometry.
Export as an .dwg model – ensure in the settings under solids – select Acis Solids
Open up the model in Rhino – Use the following settings
Move the model to the origin and rotate so it is square with your model space, this will make modifying the geometry faster
Next assess the quality of the model revit has produced. The key is to ensure there are no naked edges and open poly surfaces
Command: SelClosedSrf Command: Hide
You will now be able to see the geometry that needs to be rebuilt
Then select the front face
After rebuilding the open meshes repeat the selopenmesh and delete. Check the model has no naked edges –
Select all Command: ShowEdges
There should be 0 naked or manifold edges in the model. If there are you will need to isolate them and remodel the associated geometry.
Once the model is clear of open geometry, check the model scale and export in the relevant format for your printing software.
Revit property lines have limited visibility control as Revit assumes you would only have one property lines per project. I use worksets to control the visibility of multiple property lines across the views in a project
Property ownership line – Workset “Boundary Ownership”
Revit glass imported into 3DS Max does not render correctly, even after applying a new vray material. The glass appears with a double mirror affect and appears to render single sided or does not appear to be transparent.
When working on multi building revit projects, buildings are not linking into 3ds max in the correct location.
Set up an assembly model with the relevant buildings linked into it via real world coordinates, set up a 3d view for each building and link the buildings through this assembly model into 3ds Max, they will then link in the correct location.
Even if buildings are set up with shared coordinates and project base points are in the correct location, the FBX model linked into max will ignore this.