Yes, you're right, I used to use slic3r also and that defaulted to lines wider than the nozzle width.
When I first started using Cura I noticed that the default line widths were small and I just ignored that and carried on doing what worked well for me.
Maybe on UM machines using a narrow line width is better?
I have a photo from ages ago of the settings in Slc3r for a Prusa I used to have, they also use a wider extrusion width than the nozzle !, interesting. Seems Cura is the only slicer to default to less than the nozzle
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