ERR ERR ERR 2.0 Internal Calibration

This was bitch to figure out. It was only measuring the home spot over and over and never doing the other two. DaVinci support said to clean the nozzle and contact points. No go. Then I read that the calibration makes an electrical contact between the points and the bump on the hot end. So I cleaned the nozzle and calibration point again with a knife blade, then Acetone. I checked with an ohm meter to verify that a probe on the side of the hot end had no resistance to a probe touching the calibration point. Once the ohms were zero, I re-tried the factory calibration and got a success.

Oh course I then use my feeler gauge to get it nailed down properly.