There is no sound on the video, so I’ll just suggest a couple of common things. Check the grub screws on the pully. If they are tight, move the router by hand around the area that is making the noise. See if there is any additional resistance or binding in the area that is making the noise. Place your router in the top right and home the machine. As it is moving to the lower left, stop the router by hand. You will hear a grinding noise. Is this the same noise you are hearing with your problem? This noise, while ugly, is non-destructive. If the noise is the same, then you are looking for something that is physically impeding the movement of the steppers in the area where you hear the noise.
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