Hello,
I've found that it's possible to minimize distortions along your outer surface by using a base curve that is above the object to be flowed instead of below the object. You just need to account for your material offset and determine your base curve length using Pi*d which you can type in directly to the length box. Note the minimized outer distortion on the grey flow versus the red flow depending on the base curve position. The thickness is the same, the scaling needs to be changed to account for the base curve positioning, the circles are simply scaled along the X and Y axis and extruded to the proper depth.
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