Second experiment with Epilog Fusion M2 32 CO2 laser cutter worked better. Cut clean trough 3,5mm poplar plywood (made eurorack panels, 3 & 1u) but I didn’t get trough a (dirty & crooked) 6mm birch plywood sheet (wanted to make a case). The cutter only yielded 5w of its maximum 50w power. 3,5mm went trough with 4 passes and I tried to get trough the 6mm for two hours. The cutter will be serviced tomorrow.