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I just built my first Ender 3 V-2 printer, and I've been trying to read articles and watch videos about how to make my prints smoother and higher quality.
But I've been having issues with stringing and also extra nubs/blobs/zits of material left on corners or edges.
I've tried using test prints to gauge my temp, over/under extrusion or retraction, bed leveling, and I'm not getting different enough results between them to tell if it's working.
So my guess is it could be something mechanical that I'm not aware of.

Printer references:
• preset Super Quality in Cura 4.2
••• 200°C, 0.12 layer height
• 0.4mm nozzle
• 1.75mm PLA filament