I fought with my 3v2 for TEN DAYS with no luck. Then I just got the blue painters tape, covered the bed with that, readjusted the height and print to my hearts content.
Then I flipped the bed over to the plain glass and suddenly I could printe PLA without the tape! I was thrilled.
Then a few days later that stopped working so I went back to the tape.
I just bought the print leveling sensor. I had become aware the the bed was not perfectly flat. Figured this would go a long way to ease my frustration.... HA
When I tried to upgrade my firmware, the whole printer is useless... it will no longer boot. I've had the printer for 4 weeks and I swear I have spend three weeks fighting with it.... Grrr.