"Forbidden Planet" is probably my favorite movie; I remember watching it on TV when I was 5.
I made a model of the C-57D in Rhino3D, based on the construction drawings that appeared in the Starlog Photo Guidebook Special Effects Vol 1 (ca 1981) screen caps and the C-57D chapter in "The Saucer Fleet", mainly for dimensions and stairway details:

I've printed several versions. Here's an older version printed in a Fusion Deposition Modeling (FDM) machine. The printing artifacts would be too much work to fully remove. The blue parts were printed with a much higher resolution printer and will be used in the final builds(s):

The last two C-57s that I've printed have been the definitive ones and they're the ones going to completion. They were both printed at Shapeways.
The first of the two C-57D is made up of three parts - the upper dome, the saucer section and the lower dome. The upper dome and saucer were printed at Shapeways in Transparent Detail.
The lower dome, central post and three legs are the blue parts in the model above. They were printed at Printapart (before they stopped offering the service).
The pictures below are all of the first one, sanded down and painted to bring out any remaining scratches and printing artifacts. The bright sunlight really brings them out:

There are some scratches and printing artifacts still visible, so they will have to come out:

The legs were just painted in metalizer; they haven't been sanded or processed in any way. The printing artifacts are visible, but they're not too bad:


I still need to finish the saucer, add the dark ring around the edge and work on the stairs and central post.
The second C-57D was printed using Shapeway's frosted detail, which is a higher resolution than the Transparent Detail. This one is proving a lot harder to work with. I printed it as a single unit (upper dome, saucer and lower dome) and reduced the wall thickness to only 1mm, which makes it lighter (and cheaper) but it also tends to flex when I put pressure on it while trying to sand. Not good, since this material is not flexible and therefore it's taking longer to process.