When you are creating a polyhedron in Blender,  three most important things that you must keep in your mind are: The planes that make up the polyhedron Dihedral angle between the faces Angles between planes, if they are flattened. Let us create a Dodecahedron. 1. Open Blender. Start by deleting the default cube (Press “X” and delete) 2. Create a Cylinder Add>>Mesh>>Cylinder 3. Edit Cylinder Parameters in Tool Shelf….