After leveling my printer and printing 3 test models successfully (each print lasted approx 2 hours), I decided to print a bigger model (28 hours print).
When the printer started to work a loud noise of vacuum was heard several times for the first 30 minutes of work. A vacuum noise was never heard before that - not even low noise.
After 14 hours I noticed that the print failed and I stopped the printing. When I tried to remove the VAT I noticed that it sticks to the floor of the printer, I released it very slowly and saw that the resin was between the VAT and the floor. So I thought that there is a hole in the FEP.
Anyway, I examined the FEP and I did not see any hole or crack in the FEP, probably the FEP was not attached correctly to the VAT (but I am not sure about that).
Anyway, after taking out the VAT I noticed that the LCD is not properly leveled on the floor. Maybe the vacuum pushed it higher, but I am not sure about it. Maybe I just think that it is not in its place.
I attached pictures for your review, as I am worried to use the printer at the moment.
Waiting for your urgent response,