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Hi all. I've just got the Xtool F1 and  I've been doing some trial engravings on metal business cards and have a question. The manual focus needs the red and blue lights to coincide, but when I try to engrave with these settings it goes through the motions but no engraving. when I use the autofocus the red and blue light do not align but it engraves ok.  Am I missing something?