Found this under heat bed (inside floor of the printer). Does any one know what part it is?
It is a screw and the remains of a broken plastic post. Given the plastic color, it looks like the purge chute rear holding screw (behind the rear panel). The chute slides in a channel and is secured with 2 screws on top and that screw, it should be OK without it but if you want to check and replace you will have to remove the rear panel. The wiki says this screw was added so early production does not even had it so should be OK.
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Actually I found some post in Reddit and they say it must be the screw of the fan of the tool head. When I check out my toolhead fan, it’s missing ! screw on it 
Ah OK, plastic color was more like purge chute but great if it’s the fan! Don’t think it matters too much it’s missing there either 
