I think he's wanting just the first and last layer to be Concentric, not all the top/bottom layers:
1: Concentric
2: Lines
3: Lines
4: Infill
5: Infill
6: Lines
7: Lines
8: Concentric
Because concentric looks like but provides less strength than Lines.
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kmanstudios 1,120
Not sure what you are asking. Here is a screen shot where you can choose the top and bottom layers (concentric and lines, etc) but the infill is different.
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