it’s always one of the back corners

If it’s always in the same orientation, it also can be caused by cold wind. Look at your enclosure ventilation, or try putting an obstacle there if there isn’t an enclosure.

So many questions…

Does it use some high-distance sensor fusion, it only prints things smaller than those builtin rails, or it just assumes wheels never lose traction and fails on every print?

How is the adherence of a random household floor? Does it require some kind of wax or it fails on every print?

Again, how is the adherence of a random household floor? Can objects be removed after printing? Because if you expect models to be correct on the first try, you’ll fail on every print.

I’m sure I can fix a “why?” somewhere among the questions, but the “how?” is so interesting it would only waste space.