Here's my latest problem: This photo is of a print of this temperature tower from Thingiverse. Compared to the photos of the same object on Thingiverse, the biggest problem I'm seeing is the ugly overhang. As the printer prints, it looks as if the overhanging area is bulging upward, so the print head gouges into the existing plastic and pushes it aside, leading to a ragged overhang and an edge that bulges upward. I've tried reducing the extrusion rate to 90% with no obvious effect. I don't see anything similar in other areas -- the base of the print, for instance, looks fine. It's just overhangs that are affected. Even then, the effect is often minor to nonexistent. This problem appears in other prints, too, but it's most dramatic in this one. (The prow of a 3D Benchy is another print that tends to show this problem a lot.) So, what might be causing this? What option should I be tweaking in my slicer (or firmware -- I've just upgraded to Marlin 1.1.6, but the problem occurs with both the stock Robo firmware and the Marlin 1.1.6 firmware). Thanks for any tips!