Kobra neo, a cheap printer to begin with. The y axis rail is extruded aluminum. Where they drilled the holes in the middle to attach it to the frame it pushed the aluminum out by a few thousands. Adjusting the carriage is either really tight in the middle of the rail or loose on the ends. The bed was also bent when I got it (common issue). I bent it back and added bed adjusters because otherwise the auto need leveling just couldn’t compensate. It broke a y belt (common issue). It still has issues printing. I cannot get it to print petg at all even though the same roll of filament will work fine on another printer. All in all I wish I never bought the thing due to their poor quality control. It still prints PLA good enough so I keep it around because I wouldn’t get anything if I try to sell it.