Laser cutter has a poor engraving quality/edge

If your laser cutter’s engraving quality is very poor, it has the following possibilities:

A.Laser head is loose

Please fasten the laser head as below

B.The focus lens or the reflective mirrors are loose

Please fasten the focus lens and the three reflective mirrors as below

C.The material is loose

Use some magnet or heavy items to fasten the material

D.The machine shakes

Please fasten the four wheels and the foot cup

E.X axis belt loose

Please do these two tests

Test 1: engrave a 50x50mm square and set the scan mode as X_unilateralism

Test 2: engrave a 50x50mm square and set the scan mode as X_swing