Ben,
Here is a practice that i do when setting up a file that has never failed me and saved me to get EXACTLY back to where i need to be EVERY time.
I set my material on the table and clamp it down where i need it to be.
I do a C3 and now i am at Lower left, 0,0
My material 0,0 is in the center of the material on the table. So i move the bit to the center of material and WRITE MY X, Y COORDINATES ON PAPER
Then i Zero my X, Y at those coordinates
Now if you start your cutting and somehow lose your settings all you have to do is to go back and do a C3 and zero it back at 0,0 at lower left, then do a MY,MX(those written down coordinates) and you are back EXACTLY where you started.
Unless you have slop or something moves it should be right on the money. I have had to restart 3d carvings from a crash and saw no visible alteration from the carving. This has happened a few times over the years and saved my butt.
The key is writing down your coordinates and keeping them handy. Hope that helps
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