After a few days of trial and error with my new Ender 3 V2 last month, I finally got decent prints. Upgrading the factory, bed springs and getting accurate bed leveling at the operating temperature with the BL Touch that I added were very important steps to take.
I also figured out a quick, light spray of hair spray on the glass bed before manually preheating it, keeps even my smallest prints firmly planted on the glass bed throughout the print. Some initial prints would come loose of the bed in the middle of the print, causing a spaghetti ball of plastic, ruining the print.
Correct bed temp and nozzle temp are also key to getting good prints. So far, I use strictly PLA filament, and have found 225 deg C nozzle temp and 75 deg C bed temp work very well for me.
Because of the addition of the hair spray to the glass bed, you have to let each print cool down to near room temp to get them to easily release from the glass bed. Also, after each print, I use a teaspoon of 70% isopropyl alcohol poured onto the cooled bed and a napkin to clean the bed before doing another print.
