Like most of you, I hate to pay the price for rotary blades, even with a coupon. My sharpener is OK, but only does a 45mm blade. I have searched and searched for better sharpeners, and they are out there, but they are relatively expensive. Today the light bulb finally lit up, and I searched for how to sharpen your own rotary blade. I haven't tried this, but it sure won't cost much to try it. Supposed to work with scissors also.
http://www.pennyshands.blogspot.com/...ter-blade.html