

Select the grey layer and make the black layer invisible. The first file to export is the prep file for first color.

Now we create four ".stl" files for import into Simplif圓D: For the purposes of this demo it was easier to show it as I have.

You can either design element by element in the appropriate layer or, more likely, develop the model and then segregate into appropriate Sketchup layers. Create two new layers in Sketchup with one being for each color that is needed for your model.
