This is my experience:
I have a FF Creator Pro with the bed surface as provided by the manufacturer.
I used ABS filament that came with the printer.
The platform was leveled.
Platform temp 110, Extruder temp 230, printed with a raft.
While printing a hypercube abour 45 cm wide, at about 5 minutes in, the front left corner began to lift.
Next, I re-leveled the platform. After about 30 minutes the front left corner began to lift, but only slightly. Less lift.