I didn't really see any puckering that was that bad to me. That would have not fazed me one bit to see that in a block I made. I starch and iron my fabric before cutting. Not much can distort it after that. If the fabric is bad to work with I'll know before cutting. I don't use laundry detergent on my fabric in the pre wash. I use only warm water, if the water has fabric die in it then I don't use that fabric at all if the rinse water is discolored too.