Does anyone know where this screw came from?

Anyone recognize this screw and where it might have fallen from? I was doing some cuts and heard a shudder like noise. After the cut finished, i was cleaning up the wasteboard and this screw was laying on it. When I home the machine now, I hear that same noise I heard when cutting. Thanks all!

Most likely the M4 Z-axis belt tension bolt:

Yup, mine did the same thing last week.

You were correct! Thank you!!

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