When my blade becomes dull I sharpen it with a rotary sharpener. Love my sharpener. I have not purchased blades in at least 4 years, in fact it's probably longer then that since I am still using the ones that came with the cutter. I do a lot of cutting of batting and trimming quilts and have cut maybe 6 full to queen size tops out. The trick to using the sharpener is to always turn the sharpener clockwise as I'm sharpening the blade. (Trick my father always used when sharpening his knives, axes, etc.)