Printer screwing up in the middle of a print SOLVED

I print the indentical parts over and over on one of my R2's. After 100's of parts, all of a sudden the prints would not complete because it appeared the filament stopped feeding. I replaced everything and nothing worked until I got to the motor and replaced it with a .9 degree usongshine motor. Not only did it fix my problem but the quality of my prints went up.

The original R2 motor had run 24/7 for years and apparently they wear out.