Printing problems CoreXY

Hi
Have i new build CoreXY that I am starting up.
Did a test print and got the following dimensions:
Hight walls: 8,1 mm
Hight infill (100%) 7,8mm
Should be 7,65 mm.
The outside dimension of the squared block was 29,98 * 30,00.
The walls on the outside is looking god eccept for the corner, should be Sharp but is like its added a radius.
I am using a Chamira dual extruder.
Thanks

The bulging corners might be a result of false belt tension. The belts are either both sloppy or tensionend differently.
The height differences are neglectible. Print a taller object and see if the difference grows. Maybe finetune the z-axis' steps/mm

Edited 1 time(s). Last edit at 08/22/2017 02:05AM by o_lampe.