@ duerer I had a quick look at your file (don’t want to look at it too much, because I am at the moment also struggling with the housing and I do not want to get ‘prejudiced’/torn into doing it in a certain way…) and the problems (both the shading and the random color bleeding) are caused by your use of the Bevel Modifier…
If you apply it and look at the geometry it creates (set the distance a bit higher so you can actually see what’s happening), you”ll see the mess: concave n-gons and poles to give you nightmares…No mesh like that could survive a Subsurf!
I’d never use Bevel Weight with a delicate mesh like this and make sure I’d have full control over the topology, but of course you are free to use any method you like, but at least use more than 1 segment on the bevel (best 2, just like when you use edge loops to control the sharpness of an edge, you’ll put one on each side…)
It’s a difficult part. I will post my file when I’ve finished the housing in my thread (with just the housing), so you can see how I did it. Maybe that will be helpful in some way.
