I have had the 250 for about 4 weeks. Just started to print some projects and discovered that the Print Platform is not level. The back of the platform is down 3-4 mm compared to the front.
This makes auto leveling very difficult. I have turned Auto Leveling off and I am manually leveling the platform.
Today I have shimmed the platform in the back by 3 mm and the back/middle set of screw by 1 mm. The only place that is good to print is the front of the platform.
This is poor quality control.
When I first assembled I had some leveling problems and got instruction to type M500, M502 and G28. This helped but it did not solve the total problem.
Also… I paid for auto leveling and now I feel that it was a waste of money. The prints are so-so.