Don't Cut Corners when it comes to your quilting cutting supplies Rotary Cutters get dirty! Remember to clean the cutter when changing blades. Lint builds up under the blade.
Change blades often -
If you accidentally roll the blade over a pin, corner of a ruler or other hard object, the blade will be damaged and leave portions of the fabric uncut. Remember this when you are purchasing blades - no matter the price they are redundant when damaged.