Why are the corners coming up?
Ender 3 Pro. PLA.
Bed: 65
Nozzle: 230
Ender 3 Pro. PLA.
Bed: 65
Nozzle: 230
Ender 3 Pro. PLA.
Bed: 65
Nozzle: 230
Ender 3 Pro. PLA.
Bed: 65
Nozzle: 230