I had gone through looking at some tutorials from Missouri Star Quilt and they had a ruler that when you used it, it also sharpened the blade. It was a large one. I purchased a couple extra blades when I purchased my 60mm rotary cutter. There is a rotary sharpener out there for about $20.00 also. I get frustrated quickly with things that don't work, like pens. If anything is given(free) and doesn't work, I pitch it. No time to waste and fool around with it.