One of the most difficult spots to sand is the inside bottom edge of the lowest ring, since once the base is glued on, there's no way to make corrections.
I've posted information on this topic before, but in case you missed it, here's a picture that shows sanding a square, which is even more demanding than a circle. It's sanded the same way as the circle, but you have to be careful not to sand in curves on the straight sides. If you're making your own patterns, be sure to keep the curves at the corners wide enough to accommodate the sander.
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