I have a thin walled part where part of the wall slants away with each layer. For the area where it slants the wall becomes effectively lower with each layer because the slight offset makes the layer thinner for that one area. Eventually that section of the wall is enough lower that the next layer does not get laid down and instead stretches across the part.
The best way to see it is in this video. https://www.dropbox.com/s/road3s1kljj39 ... 1.mp4?dl=0
As the extruder comes to the front corner the nozzle is laying right down onto the previous layer. Then as it moves to the right you can see the previous layer drop away from the nozzle causing the stream to squiggle and drop down onto it. In the center where the wall is not angled the wall comes back up to the nozzle and then as it gets close to the right side (where the angle is greatest) the previous layer is much lower than the nozzle again.
This was done with a .4 nozzle and a layer height of .25mm. If I slow down the print, it does get better, but even at 50% of my normal speed it has problems. I've also tried increasing the extrusion multiplier but that did not make a significant difference.
Any suggestions?