I bought a 50W Chine laser machine from EBay. To start it was great but now I have difficulty cutting. Fitted new mirror and lens and on low power it produces a fine line but on higher power, it doesn't cut through 2mm plywood.So engraving is OK but I want to cut and not having any success. I have had the machine less than a year and am using yellow clear anti freeze as coolant. There is no makers name on the machine. The setting distance from the nozzle to the workpiece is 8mm. No details anywhere on focal length of lens.Any thoughts please? Thanks

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