I believe the "curve" you're seeing is also a Moire pattern, which is a result of the stepping from the three towers. When you're dealing with a Cartesian printer, the circles require moving the X and Y only, so the stepping patterns will be the same for every layer. However with a Delta, the X, Y, and Z are all moving. This means that the pattern will shift a little when you change layers. I hope this make sense. I have to leave shortly, so this is just a quick note.
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