I am modelling far from origin. After i increased display precision when i got suspicious about correct dimensions i dont understand how exactly input lengths are not precise. Some of the numbers are exact and some of them are off by microns.

I really dont get it how i could obtain such numbers when i always moved/modelled geometry with exact numbers.

For example this is exactly 200mm

And here i have strange dimension. I am pretty pretty sure i offseted that big block from that plate exactly 50mm in Z.

My whole model is messed up. I understand there is tolerance (0,01 mm) but even though why some numbers are exact and some are total mess. Maybe x and y is tolerable since its transformed to world axes but how Z can be not whole number when its principal axis.