Dodecahedron with Five Intersecting Tetrahedra
If you assemble five intersecting regular tetrahedra with even spacing (rotational icosahedral symmetry), you get a dodecahedron when you connect the points.
The original model had only the five tetrahedra, with point contact on the print bed. This model adds the outer Dodecahedral edges making for a stronger model and easier to get good bed adhesion. I had issues with the undersides of the outer edges with my support angle so I suggest making your support angle lower to make sure every underside is well supported.
Inspired by this video with Adam Savage and Matt Parker:
https://www.youtube.com/watch?v=s_F4uD8wAs0
More info on Wikipedia:
https://en.wikipedia.org/wiki/Compound_of_five_tetrahedra
The author marked this model as their own original creation.