There are a few good videos on square corners out there already, so I thought I would offer an alternative method which I use for heritage work as it allows the creation of a nice radius on the inside of the corner - yes, upset square corners can also have a radius if done correctly. I find this method quicker and allowing more control.
Re-uploaded as there were problems with the first edition!
![](https://i.ytimg.com/vi/1YwMV8ogKa0/maxresdefault.jpg)