Been there, done that, many, many times. The time to change my blade would have been when I had to cut 2-3 times to get a full cut, using heavier pressure. Ordinarily that might just make me stubborn, however, recovering from rotator cuff surgery in my right shoulder (I'm right-handed of course) was just plain stupid. Finally, common sense won out, and I changed the blade, now my rotary cutter cuts through fabric like butter. Yup, stubborn, stupid, that's me. At least I didn't do any serious harm to my shoulder, and it's healing nicely. However, 3 months without quilting - time for sanity check. LOL