Hey all,
I been getting over 10 questions about this so I’ll explain in steps how to create a black outline for a cube so that it gets cartoon style. It’s made that even the newbiest can do it. (I hope)
- Start a new file, delete everything (A -> Delete) and make a cube. (Space: Add -> Mesh -> Cube)
- Duplicate that cube, and without moving the mouse press enter. (Shift + D -> Enter)
You now have 2 of the same cubes on top of each other. - Make 1 of the cubes a colour you want. Like red. (Not black!) (F5 -> Add new)
- Make the other cube black. (F5 -> Add new)
- Scale up the black cube a little. (S -> type: 1.1 -> Enter) or (Alt + S, which works better on more complicated shapes)
- Go to edit mode. (Tab)
- Make sure all verticles are selected, and flip the faces of the black cube. (Crl + F -> Flip normals.)
- Go to Textured mode.
If you did everything correctly you should now see a red cube with a black outline.
What did we do:
We made an extra cube and turned the faces inside-out. That way we see the black cube behind the normal cube, and you get a outline.
This doesn’t work 100% for every shape so just experient with it a little.
Have fun blending. 
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