Yep - In find top and bottom shells to be problematic to begin with. Unlike the side shells--which are smooth within the realm of the layer height--the cross-hatched top and bottom always look rough. After 3 slicers I guess this is just a fact of life although I am not sure why--I would think a set of parallel lines of plastic spaced by the nozzle width would look nicer. I don't know of anything in the GCODE generators that controls this (or a lot of other things).Another issue I am having with speed is "sag". I find my bolt holes to be obligated --Maybe piling on on layer before the previous one has cooled---or fan speed---etcFritz