Originally Posted by sewcrafty
You also need to make sure that your fabric is straight of grain. I fold it and let it sort of fold naturally and then square up my edge with new fold. Also, if doing more than one layer really smooth out, you don't want any bumps.
Yes, I was going to say the same thing. When you are folding your fabric from selvedge to selvedge, it doesn't matter if the sides don't line up. They can be trimmed up later. Make sure that the top and bottom selvedges are lined up and your layers lay flat for your first fold. Then fold again. Flatten everything out. (I use my iron to do this.) My ironed fold is the baseline where I put the straight horizontal line on the June Tailor ruler. No wonky strips.