I have recently bought a anycubic kossel printer. I have the following issues:

-test cube is too big, its not even a square (10.6x10.8mm)

-has corners that stick out beyond sides

-if i print a circle with a iD of 8mm and a OD of 59mm i get 7.83mm ID and a OD of 59 that varys from 58.7mm-59.3

Thanks