Ever wonder how much polymer clay shrinks when you cook it? I have read that it doesn't shrink but I found out that is not entirely true. This picture is the corner of a 10 inch (55.5 cm) square piece of Sculpy III. The square shrank about 1/4 (11 mm) of an inch. (Because I wrapped a little clay around the corner I had some cracking.)
I am not sure if this is the same for other brands.