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# Mathfan Shop

## 3D PRINTED MATH

Creativity is a major part of growing up, and 3D printed toys can let kids express that. Everyone can design 3D models to print or visit websites like Thingiverse to find free models to customize or print directly. You can support the designer by clicking the tip the designer button.

Do not worry that if you cannot 3D print, you can still purchase the one-of-a-kind 3D models.

#### Hilbert Curve

One of the models mentioned in the Visualizing Mathematics with 3D Printing Book. You can use it to display iterations of HC

#### Topology Joke

One of the models mentioned in the Visualizing Mathematics with 3D Printing Book by Henry Segerman

#### Height vs Slant Height

A set of pyramids and a cone which have had slices taken out to help students identify the hidden triangles.

by mathgrrl

#### Pair of Packable Scutoids

Scutoids are a geometrical solution to 3D packing of epithelia in the journal Nature.

#### Conic Sections

A horizontal slice reveals the circle, a slanted reveals the ellipse, a vertical reveals the hyperbola, and a slanted vertical cut reveals the parabola.

#### Proof of the Theorem

Use the given regions to cover the squares to prove Pythagoras Theorem

#### Straight vs Curve

Straight bar goes through curved slit

#### Klein Bottle

This special  3D  shape with only one surface.

#### Solids of Constant Width

These shapes have the same width (height) no matter how they are rotated or rolled.

#### Puzzle 365

Famous Puzzle 365 - use petrominoes to cover all the numbers except today's

date.

#### Curves of Pursuits

3D Models of fidgets which can also be used to display the curves of pursuit.

#### 3D Fractal

Watch the horizontal cross-sections when forming the pyramid.

#### All Tessellating Pentagons

15 types of non- regular tessellating pentagons

#### Foldable Polyhedra

oldable versions of your favorite regular 3D shapes, the five Platonic Solids!

#### Slices of Menger Cube

Three different diagonal slice models of a level 2 Menger sponge.

#### Oloid-like shape

When it rolls, every point on its surface touches the ground

#### Square & Triangle Transformation

inged triangle-square dissection (Dudeney's dissection)

#### Mobius Strip 5 half-twists

2 sided  but one surface

special shape

#### 3D Optical Illusion

A triangle with three 90 degrees angle

#### Hypsometer

Usually called inclinometer. It is used to find the height of the objects using trigonometry.

#### Volume Formula

Can be used to prove the volume ratio between a cube and a square pyramid.

by ereiser

#### Cryptography

Students learn about the Caesar Cipher. They practice encoding and decoding messages using a decoder ring.

#### Brachistochrone Curve Demonstration

Which is the fastest possible path a ball can take when falling between two points?

by lgbu

#### Trammel of Archimedes

A  geometric structure for constructing ellipses or exploring mathematical relations

#### Binomial Expansion

A  model for the binomial expansion of the cube of the sum of a and b.

#### Perspective

3D object w/ the top view is a circle, the front view is a  triangle and the side view is a square.

#### Slope Puzzle 64=65

Rearrange the pieces, and the area seems to change. How can that happen?

#### 3D Optical Illusion

he Squarcle is a 3D optical illusion based on the work of Kokichi Sugihara

#### Golden Ratio Spiral

A key ring of Fibonacci  - Golden Ratio spiral

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