I tried to cut 3mm Birch ply today and to my surprise the K40 took 2 passes at full power 10mm/sec speed. I thought the k40 could do this in a single pass? I tried some test cuts at full power with a speed of 5. It still wouldn’t cut it fully in a single pass. I used a focus jig I made based on a slope test to determine the working height. Engraving was fine, vector trace was beautiful, but vector cut was disappointing.
Water pump was working fine, temps around 19c. Lens was clean. My first attempt I kept getting flare ups so on my second attempt I took the opportunity to install the air assist I had sitting around. No flare-ups after that.