Ok, I found and read it - I think you are referring to the “Rhino Bar” on page 156. This is how I have been doing things for the past year or so. Now that I have the ability to print multiple colors, I wanted to take it to the next level and encapsulate a design inside a transparent shell. The effect would be very cool. I want a smoothly printed shell layer over the encapsulated design. Using three solids does indeed print the outer two as a single but the slicers treat each as a separate object with perimeters and infill so you don’t get a clean design.
But our other option gave me an idea to cheat as it were! Here’s the update and this should print pretty close to how I would like it.
The grey object is the outer container. The green is a thin cap that fits into a recess in the container. The blue object is the logo and it intersects the surface of the recess in the container. The “seam” will be hidden around the periphery where I can hide it in the print. I think this will work!