Why My Print Failed Again and Again-The model bottom was not leveled when slicing.

Jason from the USA contacted us and asked why his prints were failing repeatedly. After we checked the bed leveling, nozzle temperature, and filament he was using,and the gcode. We discovered that the gcode showed the model was not level on the bed. We taught him how to check the model's level while slicing and he resliced the model, resulting in a successful print in the end. 

We teach him how to check the level on the software. 

The successful print in final.