# Ultimaker Core Lessons: STEAM lesson 5—Sphericons

When you rotate a symmetric polygon around a mirror axis, cut the solid into two equal parts, and then put the parts back together differently, you produce a sphericon, a three-dimensional solid with one side and two edges.

Why does it work? Create sphericons to explore the relationship between cones, cubes, and octahedrons and find out.

## Project Objectives

- Understand geometry and geometry transformations
- Understand and execute boolean operations
- Prepare a model for 3D printing
- Assemble sets of parts (magnets)
- Produce a 3D model from a 2D design
- Use the Revolve command to transform a 2D sketch to 3D object

**Recommended age range 10+****Category:** Beginner lesson **Tags:** 3D CAD, 3D printing, 3D printed, beginners, design, education**Software:** Tinkercad, Fusion 360**Lesson Duration:** One 45 minute class (additional time to print)**Estimated filament use (per person):** ~1.6-3m/~12g-24g