what are your retraction settings ?
got a link to the model ?

Just because it says doesn't need supports, doesn't mean it'll always be clean. sometimes the bridging can be quite long, and different slicers deal with it differently.
what speed are you printing at ?

Dunno if it's just me - but the bead always seems to be large and not obviously part of the those above and below from the ender 3's.
Might be cura I suppose. Never did get on with it ;-)