Metal Fragment in Nozzle

[beareth 0]

Hey guys. I'm running an Ultimaker 2+, and I noticed that my extrusion just wasn't happening. So I pulled apart my print head, and I noticed that there were actual metal fragments inside the plastic coupler. After I removed the pieces, it of course started printing flawlessly again. Did anyone else have this problem? Just curious if I should be concerned, or would like to know what part broke, or if I need to replace it.

[gr5 1,304]

I would definitely take apart the feeder and clean it out and look to see if something is grinding away.  The white feeder on the UM2+ is quite easy to take apart (half way apart anyway if you keep going after getting the cover off the stepper motor for it will fall down).  It could be the particles came from the filament spool and/or metal dust that fell into/onto the filament spool.