In a 4 part tutorial, Junghwo Park explains how to create a simple 1 storey structure in Karamba & Grasshopper and then export the geometry into Revit using IFC formats in Geometry Gym.
The third and fourth tutorial explain how Geometry Gym can be used to export the geometry created in Karamba into Revit. You can download Geometry Gym from here.
The first two tutorials show how this simple structure of beams and shell can be created in Grasshopper and then analyzed in Karamba. See Tutorial 1 & 2 – Analyze a Shell & Beam Structure.
Get the reference files here: KarambaToGGymToRevit
Part 3 – Export using Geometry Gym
Part 4 – Import into Revit using IFC
Get the reference files here: KarambaToGGymToRevit
These tutorials use Rhinoceros (Version 5 SR12 64bit), Grasshopper (0.9.0076), Karamba (1.1.0), Revit (Version 2016), Dynamo & Geometry Gym.