Hey everybody, a little heads up. My DH sold knives for years to the grocery chains. He always said there is nothing finer than a SHARP cutter, knife or other. and nothing more dangerous than a DULL one. You've answered your own question.
With a sharp cutter, it's like going thru soft butter. With a dull one, you will ALWAYS apply more pressure. When it doesn't cut, it will slip and with the extra pressure you're applying, you can't stop the momentum before it gets YOU. Please everyone, change your dull blades. It's cheaper than bleeding all over that new fabric.