Originally Posted by Milly's Mom
I had this problem doing miniatures until someone told me about aurifil thread. It is finer but just as strong than the standard quilting cotton thread and has made a difference in that hair size of being off when blocks are made. Do you preshrink/pre wash your fabric? If not, you may be shrinking the fabric just enough when you press to make a difference. Since each fabric is different this could be an issue.
I do use Aurifil for that reason
No, I don't prewash anything. I like the crispness of it when it comes from the quilt shop. It's easier for me to work with. And since I'm ironing with steam, that could be why too... hmmmm