Does auto-leveling work the same way in the Mini 2 as in the Mini 1.X? It appears the bed cannot be manually leveled in the 1.X. If this is the case in the Mini 2, what is the use of the Z-axis lock if auto leveling continuously adjusts the Z-axis during a print to accommodate tilt?
I may just be over thinking leveling. I don't have much experience printing, but what I have done was, first, with an ancient Makerbot that kept crashing the print head into the build plate. OTOH more recently, I've been borrowing time on an Ultimaker 2 that the owner says almost never needs leveling and makes good prints every time.
Now that I'm thinking of buying my own, it would be a refurb Mini 1.X vs a Ultimaker Original+. The Ultimaker is manually leveled, but I suspect the Original+ is like the Ultimaker 2 and almost never needs leveling unless it's had new parts or work done on it. And I'm just paranoid about the need for frequent leveling because of my experience with the cranky Makerbot.