Make: Geometry

PLATONIC SOLIDS

Let’s figure out the surface area of the Platonic solids we created in

Chapter 3. To do that, we can look back at the area of inscribed and

circumscribed polygons in Chapter 7 where we compute the area of a

regular polyhedron. Consider printing several of the solids from platonic_

net.scad to follow along with the geometrical reasoning here.

MODIFYING THE MODEL

The model platonic_net.scad creates nets for Platonic solids. It has

these parameters (and default values):

• faces = 4;

• Number of faces

• edge = 10;

• Length of an edge of face, mm

• linewidth = 0;

• Cut/fold line width for 2D export. Set to zero for 3D.

The Platonic ...