I did send some of my rotary cutter blades out to be sharpened once & they worked fine when I got them back. They just seemed to dull faster the 2nd time around. I don't remember where I sent them - it was from an ad in the back of Quilters Newsletter magazine I believe. Nowadays, I am always in too much of a hurry to wait to get them back! I know there are sharpeners you can buy, but I don't know anyone who has tried them.
sue