I am having problems with leveling the build plate. I run through the assisted leveling and it says it is level. However, when I send any object to it to print, the first layer doesn't stick. In fact, I swear I can see that the nozzle is above the build plate. I cannot adjust build plate any higher because the leveling screws are maxed out, it cannot make the plate any higher. I am on the latest 126.96.36.1991 firmware.
I will update the preferences to go -.4mm to see if that helps on the Z-axis
Try to tape both heatsink holes on the botom side of Smart Extruder with simple painters tape. Attach extruder to the printer, and start normal Filament Loading process, try to use a little bit of force when pushing filament into the hole with one hand, and use another one to hold it firmly attached to Carriage. This way Extruder will produce more heat and filament should release itself inside Smart Extruder. Hope it will help you. Good luck!