Then I have tried prints with different settings for "Retract Before Outer Wall" and printing temperature. I reset all settings in Cura to a default "Draft" setting and then set layer height to 0.24 mm, and turned off Infill.
Wall Line Count (3 instead of 2): This improves it some, but I suspect just by making it a little more difficult to see. Outer Wall before inner (Yes instead of No). Jerk Control - Wall Jerk max velocity change, 5 mm/s. I've tweaked a few other settings, one by one, and seeing if any have any effect. The issue occurs at the start of the outer wall (still on the same layer) that it has the issue, but by the time it ends the wall (just before switching layers) it is fine. Although it does line up with the Z seam, you can see from the G-code visualization below that the outer wall is the very last thing it does. Temp: 205 ☌, here (but tweaking this hasn't had any effect). Layer height: 0.24 mm (in the pictures, but replicated with 0.16 mm also). The printer is a Monoprice Maker Select V2. Is there some setting that I should be tweaking? I've exhausted my own ideas of different tweaks to no avail. Here you can see that by the time it finishes, it's just fine, and also what a contrast is between the start and end. Here you can see it start at the tip and get gradually better as it progresses. I have disabled retraction with no effect. The top layers seem fine (despite starting in the same place). Strangely, this only occurs on the layers with infill. Just fine on one side, but terrible on the other, precisely where it starts the layer. 
In this picture, the problem is on the outer wall (see red outer line, the print head is moving counter clockwise.Īnd here is the print showing the issue. It starts the layer in the same place every time, so it results in this vertical line, on one side of which is fine (where it finishes the layer) and the other side has bad gaps and the wall is much thinner. I have a severe under extrusion when the printer starts the outer wall, which is resolved by the time it finishes the outer wall.
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