I just bought a brandnew Ultimaker 3 Extended. Ive done all calibrations after unboxing. Now I have the problem that x and y measurements dont have the same size when I print a 20x20x20 cube. I measured the cube with my Mitutoyo caliper and measured 19.7mm in X, 20.2 in Y and 20.05 in Z. The Z axis is fine.
It is not possible to print round parts.