Andriy,
I started with a blank new model, so there is no extra geometry. What I discovered while looking at it again was that the possible bug is related to the "use model extents" checkbox - it doesn't seem to be able to process objects smaller than about 300 mm or one foot. Unchecking that works, but the problem is that the white space visible around the model will print.
This has never been a problem for me, because as an architect I mostly deal with large objects, but I became aware of this when seeing the number of posts in SU-related forums asking the same "why does SU need xx pages to print my small part to 1:1 scale?" question that seems to bother especially woodworkers who need to print their templates from SU.
Anssi