SM2 A350 was arrived to me 20.12.2020 with FW 1.8, thats reason of error. After changed to FW 1.10.1 laser cutting much batter. Luban 3.12 make a few errors in tracing small not closed lines that bigest not tracing was by FW 1.8.
For knew owners have to update FirmWare first. FW 1.10.1 has got a few problems in 3D printer so SM2 is not perfect 
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