I wanted to add a little twist to my swap blocks, so I added a different 2" border to each one. I used some of the fabrics I had used in the blocks I made. This made the blocks about 15 1/2".
I decided I could recut them 14". I have a 15" square up ruler, but I was afraid I might mess up the cutting so I cut a 14" square of cardboard. That helped me center it on the square, and see that I was staying in the area I needed to be in.
Then I laid the ruler on top of it, lining it up with 2 sides of the cardboard, to get a good cut.
Then I used the ruler to square up the last 2 sides.