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Hi! i just got the PS2 and its my second day using it, so theres not a lot of wear or degradation. I ran a 22min cut job for ¼" black acrylic, where i cut out 4 identical shapes. I used their recommended material settings after having done a material test array and the recommendation proving to be the best option. Im cutting four identical shapes, the first two cut perfectly, but the third had some burn marks, and the fourth had worse burn marks and did not cut all the way through. What could be the problem? Thank you !