This also happened when I was using a pinking blade and when you run the ruler over with the blade it gets dull quick. So I taped two rulers of the same size together and this seems to have helped a lot.
Originally Posted by
PaperPrincess
Be very careful if you use it with a ruler. The shape of the blade makes it easy to jump over the top of the ruler and can be dangerous. Good place to use a Klutz Glove if you have one. The only time I use mine, and not for fabric, is in a cutter/ruler combo, not a rotary handle.