Accuracy is important, consistency equally important. I find that if I have an odd block, most often I cut a strip wrong. You can check by turning it over and using your small ruler to measure the width of the strips instead of completely taking it apart. You can usually find the culprit. Then you can put a little batting and backing on the little block. Bind it, quilt it and put it under a nice cup of coffee or tea. I never throw away an imperfect block.