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Start point
There are a number of advantages of using the center point of the material as the starting point of the cut files. Say on a 20X30 inch piece the start point would 10,15
It is difficult to get lost with this method.
Of course you still cannot mount the material 90 degrees the wrong way....
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Glad you got it figured out. Fiddling with z depth can also be a valuable tool. Say you cut a 3d in one pass and its a little too fuzzy for your taste. In a safe location you can move your z to say -.03, press "ZZ", and rerun the file to clean up the part.
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That's cool, thanks! I love learning these kinds of tips.
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A lot of times, simply running the toolpath again will reduce sanding to almost nothing.
I'm lazy and hate to sand, and ruin fine details, and I learned that here on forum:)
If you have any tearout, or mucked up settings a little, then Recutting deeper like Dave said can rescue a piece.