Flashforge The Best 3D Printer Calibration without sheet of paper

This was going with the machine's default settings after calibrating automatically using the default settings - I was told to use a sheet of paper, and the next video is the same. Watch - and in the third video - someone was trying to help me and said the settings I used were correct - watch the third video, lol - it ran beautifully for 45 minutes - then after 1 hour the models gain, got dragged off the bed. There is no hope for these Flashforge machines.
Flashforge. Flashforge 3D printers. 3d Printing Industry. 3D printing. 3d printer calibration.