Yep, pretty much the way I've always done it. I typically scan at 600 dpi and then import the image into AutoCad and trace the lines in a drawing. Have no idea how AutoCad knows to do it, but the image is exactly 1:1 at 600 dpi when it's in the drawing window. So basically the accuracy is 1/600th of an inch. Use the various drawing tools to trace the image, extrude it to the thickness you want ... save as an STL file, slice it with the printer software and print.
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