I need help. I think I am just stupid that I'm having a problem with this tube. Somehow I do something wrong when I make my first cut, it turns out real small, I think the other cuts are ok?? not sure. What is the size of this square. This is such a great idea, would like to make a table runner using 3 blocks. Am I correct in my thinking that you need to cut out 2 blocks before you can do any of the neat placement of pieces? Please someone help this stupid person. And the size of the 4 squares put together. Thanks