If your prints aren't printing correctly, you might want to look at what is happening with your extruder. I purchased filament for our snowflakes and I was getting burnt clumps in the printing.
Instead of thinking it was the extruder, I blamed the filament. But now after printing about 5 different projects with different filament, I finally pulled the extruder off only to find that it is extruding around the extruder head.
Lesson learned: Don't wait to investigate!