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I had the same sort of result, then I tweaked around with the settings from default and have improved the results so that the 25 degree overhang is successful, The 20 and 15 are still a challenge. I had to slow the outside perimeter speeds down, over-volted (12v to 28v!) my non-stock twin cooling fans and took down the extrude temperature 10c. I'm still playing around a bit with the extrusion multiplier.