I am making a Minecraft character following BorncCG's tutorial, and this is my result for the arms movement: As you can see, the outside of the arm bends nicely, but the inside has this ugly crease.
If I bend the arm even more, the crease disappears, but the arm intersects itself which I'm sure will cause problems later. Here is how the arm is weighted:
How do I fix the crease, and hopefully the intersecting too?
Using a combination of both the answers I have gotten (thanks!) I have created a much better result, but there's still a problem. I think the problem is that the top and bottom edges circled here are not parallel, so instead of retaining it's cube shape, it gets sheared/stretched. How do i fix this? If the problem is in my mesh, I will happily change how it is made to fix the problem, pretty much anything it takes. Thanks!