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Thanks.
It is generally accepted that you should print with extrusion widths greater than your nozzle diameter. The "go-to" default extrusion width of most slicers is 120% of the nozzle diameter. With a 0.4mm nozzle (what I use as well out of my E3D hot end) that would be 0.48mm.
The reason I choose 0.5mm is because it is much easier to design parts with features that are a multiple of that than pretty much anything else.