Mathematics

Day 211 – …And the Rest

Day 211 – …And the Rest 640 480 mathgrrl

Or the Professor and Mary Ann, as they prefer to be called. Our last two Catalan solids are the Triakis Tetrahedron (dual of the Truncated Tetrahedron and Kleetope of the…

Day 210 – Rhombic Dodecahedron

Day 210 – Rhombic Dodecahedron 640 480 mathgrrl

We’re almost at the end of the Catalan series! Today we printed our eleventh, the Rhombic Dodecahedron, dual of the Cuboctahedron (which we also constructed with printed snap-tiles on Day 87). Thingiverse…

Day 209 – Afinia Menger

Day 209 – Afinia Menger 640 480 mathgrrl

Most of our prints for this blog are made on a MakerBot Replicator 2, since that’s what we usually have at the house. But the other day one of the…

Day 208 – 26mm Level 3’s and the Sketch A Menger Cross-Section Competition™

Day 208 – 26mm Level 3’s and the Sketch A Menger Cross-Section Competition™ 1024 768 mathgrrl

I love to root for the underdog: David vs Goliath, Buffy vs the entire Hellmouth, the Baudelaire twins against Count Olaf and his evil theatre troupe. Today the role of the underdog…

Day 206 – Menger coverups

Day 206 – Menger coverups 1024 768 mathgrrl

At this year’s Gathering for Gardner Conference (G4G11) I gave a short talk about 3D printing sliced Menger sponges. So that people could look at the sliced models and guess…

Day 205 – Disdyakis Triacontahedron

Day 205 – Disdyakis Triacontahedron 640 480 mathgrrl

Today is our largest Catalan print so far, with a diameter of over 120 millimeters – about the size of a very large grapefruit. One cool thing about this model is…

Day 204 – Pentakis Dodecahedron

Day 204 – Pentakis Dodecahedron 640 480 mathgrrl

Yes, we seem to have fallen behind again. We can talk more about that on some “Friday.” For now we’ll catch up with the rest of our Catalan prints and…

Day 203 – Rhombic Triacontahedron

Day 203 – Rhombic Triacontahedron 640 480 mathgrrl

This Catalan solid is the Rhombic Triacontahedron, the dual of the Icosidodecahedron (which we’ve already printed twice before as a snap-together model, in Day 89 and Day 117). Thingiverse link: http://www.thingiverse.com/thing:274427 Settings: .3mm/low…

Day 202 – Triakis Octahedron

Day 202 – Triakis Octahedron 640 480 mathgrrl

New fact of the day: If you add a pyramid to each face of an octahedron, then you are taking its “Kleetope.” A cool new word for me, leading to…

Day 201 – Saturday guest: owens and the Tetrahemihexahedron

Day 201 – Saturday guest: owens and the Tetrahemihexahedron 628 472 mathgrrl

Today’s post is contributed by Bill Owens, also known as owens on Thingiverse. He is the creator of the Customizable Menger Sponge and Customizable Sierpinski Tetrix models that cleverly print…

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