The failures of laser engraving marks are unclear and may be due to incorrect focus, mismatch of parameters and materials, etc. Please refer to the following steps to check.

1) First make sure the focus is correct.

 Use the focus block to adjust the focal length. 

2) Check if the S value in Lightburn

That is, click Lightburn-Edit-Device Setting and check whether the S-value MAX is 1000.

3) Check the parameters

Check whether the engraving parameters are correct, especially the speed unit; please refer to the parameter table on the official website. And for the LaserGRBL software, the value of S-MAX is 10 times the target laser power, such as when the laser power is 100%, S-MAX needs to be set to 1000%

4) Turn on the constant power

When editing parameters, make sure the laser mode is set to constant power mode, as shown in the figure.

5) Check the window mirror

Check whether the window mirror of the laser head unit is contaminated. If there is contamination, it is recommended to use lens cleaning paper or a dust-free cloth soaked in alcohol to wipe gently to avoid damaging the coating.