Hey guys. Been out for a bit and now I'm back.

I was recently happily printing away when my left head started making a chunking sound when feeding. So I took it apart and found a loose piece of filament by the gear. I took it out, reassembled, and...chunk, chunk, chunk.

It DOES, however, feed while it's doing that. But still, chunk chunk.

Any suggestions the most likely culprit?