There are two versions of this. One is one solid piece, the other is in two parts (separate stl files), which is more printer friendly. I haven't tried printing out the solid one, but it should be fine if printed with support material.
I would suggest coating the inside with a water proof material such as spray-on enamel if you intend to use it as a flower pot. I printed mine with two perimeters and filled it with water. I dumped it out after about a minute and could hear water inside when I shook it.