I don’t think it will affect the printer in any way, but if you want, you can remove the back panel and take out the piece of filament.
When I needed to change my P2s back panel I was surprised of how many poops and filament pieces there were! (The printer worked perfectly)
That’s fine it won’t interfere with anything. To remove it you will have to remove the rear panel so best to keep it there. You’ve seen that one but some debris may have already found their way in there and I bet we all had some at some point 
Martha sez, “If it works, don’t fix it.”
If it bothers you, then follow the above advice and carefully remove the back and clean out whatever you find, at least you will have that peace of mind knowing, and you will have had a (hopefully) enlightening adventure in the entrails of your printer.
Just ask yourself this: Am I mechanically inclined enough to disassemble, then reassemble my printer?
Thanks! I’m a mechanical engineer, so I could take it apart… but I think I’ll just leave it alone. 
If everything is working fine, no need to create a bigger problem, as you said. Thanks for the advice!
Save that knowledge for when the 
hits the 𖣘
