# Mathematics

### Day 100 – Tiny Icosahedron surprise ball

Day 100 – Tiny Icosahedron surprise ball 640 480 mathgrrl

I have a small gift I have to give someone secretly at a party, so I enclosed it in this tiny hollow icosahedron. Safe to show off at the party…

### Day 91 – Truncated Icosahedron

Day 91 – Truncated Icosahedron 640 480 mathgrrl

We didn’t have time to make this one earlier, so here it is now. A truncated icosahedron (Buckyball/soccerball/football depending on who you are). I made the snaps really tight so…

### Day 90 – Stellated Octahedron

Day 90 – Stellated Octahedron 640 480 mathgrrl

And finally, the last of the set of models from my entry to the Makerbot Academy Math Manipulative Challenge on Thingiverse. This model shows that we can use the individual snap tiles to…

### Day 89 – Icosidodecahedron

Day 89 – Icosidodecahedron 640 480 mathgrrl

Today, the simplest Archimedian solid using triangles and pentagons, the icosidodecahedron: STL file: http://www.geekhaus.com/makerhome/day89_icosidodecahedron.stl Tinkercad link: https://tinkercad.com/things/9rjPDpql1vO-tiles-for-icosidodecahedron Thingiverse link: http://www.thingiverse.com/thing:185859 Settings: The tiles are optimized to work with the low/.3mm MakerWare setting…

### Day 88 – Truncated Octahedron

Day 88 – Truncated Octahedron 640 480 mathgrrl

Yesterday’s model was the simplest Archimedian solid with square and triangle faces. Today we have the simplest semi-regular polyhedron with square and hexagon faces, the truncated octahedron: STL file: http://www.geekhaus.com/makerhome/day88_truncatedoctahedron.stl Tinkercad…

### Day 87 – Cuboctahedron

Day 87 – Cuboctahedron 640 480 mathgrrl

To get more flexibility constructing polyhedra we can use individual snap tiles instead of pre-arranged hinged nets. This also allows us to make nice two-color semi-regular polyhedra, such as this…

### Day 86 – Rectangular Rhombohedron

Day 86 – Rectangular Rhombohedron 640 480 mathgrrl

The last of the polyhedral nets so far is for a rectangular rhombohedron: STL file: http://www.geekhaus.com/makerhome/day86_rhombohedron.stl Tinkercad link: https://tinkercad.com/things/4QmyBzqKqlL-hinged-rhombohedron Thingiverse link: http://www.thingiverse.com/thing:185859 Settings: Low/.3mm MakerWare settings on a Replicator 2 in one hour…

### Day 85 – Hexagonal Prism

Day 85 – Hexagonal Prism 640 480 mathgrrl

Of course there are many polyhedra that aren’t one of the five Platonic solids that we just posted about. For example, prisms. Here is a hexagonal prism made out of…

### Day 84 – Hinged Icosahedron

Day 84 – Hinged Icosahedron 640 480 mathgrrl

The final Platonic solid in the set of models we entered into the MakerBot Academy Math Manipulatives Challenge was the icosahedron. STL file: http://www.geekhaus.com/makerhome/day84_icosahedron.stl Tinkercad link: https://tinkercad.com/things/iBwf0NJMgfY-hinged-icosahedron Thingiverse link: http://www.thingiverse.com/thing:185859 Settings: MakerWare…

### Day 83 – Hinged Dodecahedron

Day 83 – Hinged Dodecahedron 640 480 mathgrrl

Of all the hinged polyhedral nets we made for the Makerbot Academy Math Manipulative Challenge, the dodecahedron came out the best. It just hit the sweet spot of angle and…