ok in the preview you should not see gaps between the lines. they should all touch no matter what your width setting. here are some pics. 1st is at 60%, second is 100% and third is 170%. you can see there are no gaps. this is pretty much how you printer should print. if not you need to set it to 100% then tighten the gap between your nozzle and built surface until the layer lines touch. or run a thin wall calibration to adjust your multiplier.

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