I started a new quilt Stars and Wheels. I got the first block done . But here is the problem. They are all 2 1/2 in blocks . Now I measured three times be for cutting. So that is right . And my 2 1/2 in square trangles were measured 3xs. They are right. And I measured my 1/4 in seam on my maching and marked it and I used the same ruler. But when I did the 4 smaller blocks that were surpose to be 8 1/2 in square. They were not. they were 8in square. And the whole block was to be 16 !/2 in square Now it is 15 1/2 in square. Where did I go wrong. my quilt is going to be samler than I wanted it to be. guse I am going to add an extar boarder to it. Willtake pics of it later.