I use the 45 to cut through up to 8 layers of fabric. The 60 will cut 12 layers if you are determined enough. I probably wouldn't even attempt more than 2 or 3 with the 28. The overall size, handle & blade, just don't seem tough enough to do many layers. I do notice that the smaller the mm, the quicker the blade gets dull. Maybe it's because I have been using the 28mm for cutting around the arcs and they all include paper. Duh....In some of the areas of Desert Sky and Bali Wedding Star where a lot of seams meet, I am cutting through at least 4 fabrics, a seam and the paper. I'm pushing down with a lot of force. When I am using the 60, there is only 1 piece of paper with the 12 layers of fabric. Probably makes a difference.
Just a little added note. I took a class from Judy Niemeyer recently. When she cuts around her arcs or inset circles as in Desert Sky, Sunflower Illusions, etc, she uses her 60mm and she is very accurate. I was amazed. I couldn't cut evenly with my 45mm, and there she was, using the 60mm. So, just because I feel more comfortable using the 28mm, that doesn't mean you might not feel very comfortable using the larger blades.
Last edited by Barb in Louisiana; 04-27-2014 at 11:33 AM.