I had this happen just the other day... The cutter was rolling fine but felt like it had a FLAT TIRE! Turns out when I changed to new blade I put the cutter together backwards. I have the old style Olfa 45mm cutter with the BIG black screw head on the same side as the safety that slides up to cover the blade when not in use. Google your type of cutter for a video of how to change the blade. BTW - I have been rotary quilting for 20 years and this is the 2nd time I have put it in backwards... duh ! I seriously doubt that the cutter itself every wears out... but ya never know!!! Happy Quilting