[Furry prints ... how to get rid of the hair ...]

@gr5 do you find that hardened steel nozzles produce more stringing?

[Furry prints ... how to get rid of the hair ...]

I know this thread is super old but wanted to comment on it.  I recently started having pretty bad stringing issues with most PLA filament that I hadn't had before.  I tweaked lots of setting (retraction distance, fan speed, extrusion multiplier, Z lift, etc) and printed tests with very little change in quality.  It dawned on me that most of my issues started when I switched to a hardened steel nozzle from E3D.  I had always used a brass nozzle.  Anyway, I switched back to a brass nozzle and quality with regards to stringing was improved.  If you can see the picture, the ones on the left are all prints I did by altering previously mentioned settings to try to reduce stringing.  The one on the right is after I put the brass nozzle back on.  0.4mm E3D nozzle, Prusa MK3S, 210/65, 1.5mm retraction, Z lift 0, retraction speed 60mm/s, 0.15mm ht, solutech and hatchbox pla.  I'm not sure why, in my case, the hardened steel nozzle is more prone to this.  It appears clean.