# Mathematics

### Day 82 – Hinged Octahedron

Day 82 – Hinged Octahedron 640 480 mathgrrl

Working our way through the five Platonic solids that were included in my entry for the Makerbot Academy Math Manipulative Challenge, today’s blog item is a hinged octahedron. STL file: http://www.geekhaus.com/makerhome/day82_octahedron.stl…

### Day 81 – Hinged Cube

Day 81 – Hinged Cube 640 480 mathgrrl

So I guess my reward for working night and day on the Makerbot Academy Math Manipulative Challenge for a week is that I can now post each model separately on…

### Day 80 – Hinged Tetrahedron

Day 80 – Hinged Tetrahedron 640 480 mathgrrl

Over the next several posts here I’ll put up pictures and files of the objects in the set of polyhedral models I made for the Makerbot Academy Math Manipulative Challenge.…

### Day 74 – Decasphericons

Day 74 – Decasphericons 640 480 mathgrrl

Today we printed and assembled the two types of decasphericon models from chriskpalmer’s Sphericons on Thingiverse.  We used Gorilla Glue to install 3mm Neodymium Rare Earth Super Magnets in the…

### MakerHome Day 67 – The knot 8_19

MakerHome Day 67 – The knot 8_19 640 480 mathgrrl

The real reason for printing the knot 8_18 yesterday was to compare it to a print of 8_19, the first non-alternating knot in the standard knot table. STL file: http://www.geekhaus.com/makerhome/day67_knot819.stl Tinkercad…

### Day 66 – The knot 8_18

Day 66 – The knot 8_18 640 480 mathgrrl

Our initial reason forgetting a 3D printer was to print mathematical models of knots, so today we go back to our roots and print a model of the knot 8_18…

### Day 63 – Tetrahinge

Day 63 – Tetrahinge 640 480 mathgrrl

Trying to find a better solution for making polyhedral nets than the folding models from Day 44, today we have a hinged version of a tetrahedron.  The hinges are built…

### Day 61 – Hilbert steps

Day 61 – Hilbert steps 640 480 mathgrrl

Okay, so maybe Day 60‘s model was maybe based on a Hilbert curve, not a Peano curve. So, we may as well make another model out of it. This one also…

### Day 60 – Peano curve

Day 60 – Peano curve 640 480 mathgrrl

Today we have a space-filling Peano curve with a dish-like indentation just because it looks cooler that way. More dish-y and more space-filling-y than the H-Tree from Day 57! The…

### Day 57 – H-Tree dish

Day 57 – H-Tree dish 640 480 mathgrrl

Here is a small dish whose pattern comes from a level 5 H-Tree, which is a fractal space-filling curve. It is designed so that a Replicator 2 on “low” will…