after all of your blocks are finished measure each one- then either trim them all down to the smallest- or add narrow border/sashings to bring the all up to the largest- or you can (adjust) your setting's to bring them all up to the same size....don't stress too much until they are all done- just strive to get better with each new block- it is kind of *fun* to look at my very first one---see how the first blocks compare to the final ones & how it all compares to (now)---'i;ve come a long way baby!