Also, if the blocks & triangles are cut accurately, then your problem 'could' be that you're not doing EXACTLY quarter inch seams. I try to gauge my seams by the thickness of the thread line smaller than quarter inch....not easy...but you learn by lining up with the presser foot. You can usually find a spot there that you can follow along the edge of the fabric. Better still, get a 1/4" foot; makes it so much easier. Persevere! One day it will be like you've done it all your life.
