Last night I used tarkin, and i had to slow down my speed on 1/8th birch to 25 and power 100 to cut through. Even then, I still had a lot to cut by hand. My initial and humble thought is it could be the CO2? Not sure.
Agree that Tarkin cut quality deteriorates as you go down and to the right. Consistent across at least 3-4 sessions of trying to cut thicker material. Even had issues with 3/16th acrylic though, not just 3/4 in ply.
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