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Print gaps. Marlin settings, slicer settings or mechanical?

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I have now upgraded my A-101 to an E3D-V6 hot end.

Now I'm back to figuring out the problems that I set out to figure out before I buggered the old nozzle...

The photo below is of the right most (positive X) corner of a 20x20x20mm cube. Note the layers near the corner are curling upward.
The effect is seen in all 4 corners, and strats to get noticeable about at about 25% of the over height.
[attachment 98623 Side-1.jpg]

The more concerning issue is shown in the infill in the top layer/s. There is a gap that is most pronounced on the right side.

[attachment 98624 Top_good-1.jpg]

Since this was the issue before the nozzle was replaced, I'm guessing that this is not a nozzle issue...

This print was done with a 0.4mm nozzle, 0.2mm layer height, 5 top layers, and 30% overlap.

At this point I'm looking for ideas and recommendations for trouble shooting.

I have tried overlap settings, that seemed to have no effect...that confused me. :S

Regards,
Mac

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