This model is a "2D" version of the Celtic Knot with seed 12. It matches with the 3D version that uses the same seed and can be found here: http://shpws.me/3L17
The model has been successfully printed using WSF polished, with nice results. The model has four loops and although the weave was supposed to allow a gap between the threads where they cross, they're actually fused in the final print.
Note that the colour image is purely to illustrate the four different threads. The model doesn't actually contain colour data.