This is a Sudanese Moebius Strip. It is topologically homeomorphic to more typical embeddings of Moebius strips, so it only has one side (non-orientable), and one edge. However, the "Sudanese" Moebius strip has the additional property that the one edge forms a perfect circle.
This print also makes for a nice two-sided flower vase!
I was able to print without supports, but a brim is necessary to allow the figure to stand up straight.
sudanese.stl | 1.2MB |