首先确保喷嘴高度值是正确的ly set, so that the first lyaer is adhering properly.
Then do a manual 9 point leveling with the calibration card included, so that you will get 9 compensation values, These value should not have difference larger than 0.5mm.
Finally make sure to use raft to print on perforated board, if use no raft, the leveling data will not apply to the print.