OK. Well, here's a recipe for a dodecahedron. I'll post a quick step-by-step for now, later I can go into more of the why-for if anyone is interested. 1. In the vertex modeller, insert an oval U size 2, V size 2, 5 sides, perpendicular to the Z axis. This will create a pentagon. 2. Select the pentagon. Copy it, paste. Then, Select--> Move, and move it in the X direction 0.81. This will align one side of the pentagon with the Y-axis. 3. Rotate the selection -116.56 on the Y axis, then move it back in the X direction -0.81. Copy. 4. Paste. Rotate 72 degrees on the Z axis. 5. Paste. Rotate 144 degrees on the Z axis. 6. Paste. Rotate -72 degrees on the Z axis. 7. Paste. Rotate -144 degrees on the Z axis. 8. Select all. Then Selection --> Weld, using a custom tolerance of 0.01. This will reduce the vertices to 15, and complete the bottom half of the shape. 9. Copy, then rotate on the X axis 180 degrees. 10. Then rotate on the Z axis 36 degrees. 11. Then move in the Z direction 2.62 inches. 12. Select all, the Weld, using a custom tolerance of 0.01. 13. Then Selection --> Crease edges --> All 14. Amazing your friends and families with your mighty dodeaohedron modelling powers. 9.