I've been teaching myself how to rotary cut. Its been going great so far. Today I decided to finish cutting my binding strips, which started off great but then it gave me problems. In some spots it hadn't cut through the second layer of fabric. Then I'd have to go back and make another swipe...and half the time my hand would shift and the ruler would be off and I'd cut in the wrong spot. I was applying the same amount of pressure as I normally would and after it wouldn't cut right I would apply just a little bit more and it still wouldn't cut all the way through.
I think my blade needs to be changed, but I've only cut a yard of fabric (mostly into 2 1/2" strips and then a 12x14" panel). Seems like it would be too soon to change blades. But I'm new to rotary cutting so I don't know how often the blades should be changed. How often should blades be changed?