A.Check if the laser focal length is correctly adjusted. B.To achieve a better effect,we suggest following the recommended operating parameters in the user manual. C.Check if the laser lens is covered by foreign objects and keep it clean and clear. D.Confirm whether the software settings are wrong (for LightBurn). E.If the material for engraving or cutting is distorted and uneven,please ensure it is flat and even before proceeding. F.The cutting speed is not recommended to be lower than 120 mm/min.For cutting thicker materials,we suggest cutting them in separate passes.If the speed is too low,it may cause serious burning around the cutting edge.