I found the device as in the figure below after leaving a printing process for about 9 hours. The glass mat had come out of the device and fell to the floor. The print core had pressed strongly on the heat table and deep scratches were formed. The filament was stuffed into the print core and clogged.
Before starting the process, the device was calibrated. Even if it wasn't calibrated, shouldn't the print head be able to recognize the surface and stop? Couldn't the distance sensor have prevented such massive damage?
The clogging problem could be solved somehow, but how to repair the damage to the device and the print core?