Quote Originally Posted by lovincup View Post
Yes, this is one of my theories, That's why I was thinking perhaps the gears might have warped or worn out causing inconsistent extrusion, or excess pressure built up due to partial blockage.
I was thinking something similar when I saw that happen on my printer. I was able to watch the print and as soon as it started happening I used a Sharpie to mark where my extruder gears were meshing together. The problem did repeat every time the marks meshed with each other. I never got rid of the entire problem. But there was a combination of gear teeth that aggravated the issue. You might want to try that and see if you can spot a similarity.