Once the seams, which join the subunits, have been sewn, use a letter opener to slit open the folds which enclose fabric within the seams. These skinny strips of paper can be removed before pressing for a flat block. Of course the rest of the paper should not be removed until the top has been sewn together. (From: Perfect Blocks)

Gerry Frost, of Libby, Montana and the Kootenai Quilters Guild, came up with a great way to crease the patterns' fold lines. She uses a thin serrated dressmaker's wheel to score the paper. She carefully positions a ruler along the dotted fold line and then runs the wheel against the ruler. The wheel creases the fold line exactly, which is crucial. Gerry said this works fantastically, and it does!