Thank you for your response.
The filament was dried for 20 hours at 55°C and stored in a vacuum-sealed container. The print bed was cleaned with water and detergent (I did not use a brush). The room where the printer is located is cold, but I purchased a Chitu enclosure that fully encloses the printer, raising the internal temperature to a stable 24°C. The model was downloaded from Bambu’s website and uses the settings provided by the model’s creator, with only two modifications compared to the default ones.
I also tried to print a benchy boat and the result seems decent to me. In the evening I can post a photograph because I’m at work now.
I don’t understand much about it but I noticed that the defect occurs near the seam when the rectangle closes as if it depended on a deceleration.
In fact, at the handle the stitching occurs under the handle and the problem occurs before and after the height of the drawer handle and not at the height of the handle.
I’ll try decreasing the speed to see what effect it has on the print
I will also try to print a rectangular model designed by me to see if I have the same problem
PS: I don’t know if you can see it but there is also some hanging fluff