Ditto. Blades are expensive and maybe we wait so long because of the expense? Here's a tip I try to remember with every cut: Among the various costs of quilting...fabric, thread, sewing machine, batting, time, quilting (if you send it out), the least expensive is the $2 or $3 for a rotary blade. For the sake of even seam allowances, wear and tear on our arms, we should change our blades as often as needed!!