Hinged geodesic saddleby
Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:1608483.
This model is featured in figure 4.8 of Visualizing Mathematics with 3D Printing. This is joint work with Geoffrey Irving.
This was printed on an SLS machine. I have no idea if it will work on other kinds of 3D printer. Let me know if you can get it to work!