Originally Posted by Havplenty

there are usually two things that go wrong if the block sizes come up short and that is proper cutting and correct seam allowance. hopefully you have either tape marked a 1/4" seam allowance on your sewing area or you have a 1/4" foot for your machine. i also keep a seam gauge by my machine when sewing to double check my seams. next make sure you cut the pieces correctly. plus there is the OMG scant 1/4" seam, which is just to the inside of the 1/4" seam mark.

double check your work (cutting & seams) and perhaps you will find where you were off. happy block making. i was trying to find the diagram where it shows the scant seam marker one a 1/4" seam foot. i will post if i find what i did with it.

mary