These are Just some Mobius Strips I whipped up after watching Angus' video on designing them with fusion 360. So I gave it a try. CubicMobiusStrip.stl is an extruded rotated square, hex is a hexagon, and line is a 2d thing. I think it is interesting.
Angus' video: https://youtu.be/AFzLHNXiwx8
Layer Height: 0.2 mm
Edit: I don't know what is wrong with the mesh on the 2d Strip. Thingiverse just has trouble Rendering it because well, it has no thickness.
Overview and Background
Lesson Plan and Activity