Anycubic Chiron - failed temperature sensor and other problems

a couple of design & manufacturing problems have marred my experience with what is essentially a good 3d printer. not mentioned in the video is the build plate adhesion diminishes very quickly and was not very effective for abs or pteg right from the beginning. The first nozzle temperature sensor failed after 6 months. (they must know that this is an ongoing problem as they supply a spare one in the box.) the track bearings were never fully tightened by Anycubic. the printing nozzle channel bore diameter causes the filament to be almost impossible to change. Bad design.