Ironing seams
I just discovered something I know most of you already know, but for some newbies like myself, be careful when you iron your blocks! I was using a jelly roll to make a Rail Fence. I sewed the strips together and then cut into squares. As I was squaring them up I found several that were 1/8 inch too short. Something I had read on QB made me look at the seams. When I had ironed them in long strips I had created a pleat that had shorted my blocks. Fortunately re-ironing them corrected the problem. Good thing I read QB!