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Cool. Thank you. Gives me a goal.

SO far, I have found (in Cura) That the inner wall defaults to print twice as fast as the outer wall. For most prints, this is probably fine as the inside isn't seen usually. Slowing the inner wall speed to the same as the outer wall vastly improved the inside surface making it slide better and resulting in a longer extension of the blade. Also, with each print, I have dialed back the flow % and each print gets better. I do not think I over extrude in general, as I regularly do the extrusion test and calibration. I just think the nature of these tubes, being printed vertically and fitting inside each other makes them very very finicky about clearance space.