X1C Vibrating sound

Hello, everyone,
yesterday during a long print i noticed that the printer is making a strange noise.
To be more precise, it almost sounds like something is resonating here. However, this only occurs when the print head is in the rear third of the print bed. (In the case when he was at the prime tower) But the whole thing is reproducible if you place a print there.
So far I have retensioned the belt according to the instructions, not that it vibrates.
does anyone have any ideas as to what could be causing this? I’ve also attached a video where you can hear the whole thing.https://www.youtube.com/watch?v=j3OYNpxiWSs&ab_channel=Kevin3110%5BDE%5D