I think it is coming from the left side of the machine... maybe the ball bearing unit in the box that extends below the gantry.I can't tell by the video where the sound is coming from. Can you tell where it's coming from?
Thank youThat is the motor that moves the gantry. I haven't had any experience with those failing yet but it sounds like something is up. I have heard a similar noise on roll to roll machines and it was the voltage setting of the motor itself. I would contact Mimaki and see what they say. You might need a tech to come out.