Hi Psygorn,

re:
> However, I want to ask you something do u know if I a mesh which is joined surfaces and
> pretty small gap is printable or not?

It depends on the particular situation but probably not.

It's more of a problem than just a gap - the triangulation generated for the STL file will not have watertight synchronized vertex structures across the unjoined edges.

Maybe some slicers could tolerate that but I kind of doubt it.

- Michael