Absurdly, now that I'm actually working at MakerBot I seem to have stopped posting models to Thingiverse... until now. Thanks to 3D-printing hero atartanian, I'm now in a knock-down, drag-out, winner-take-all, print-a-thing-every-week battle. My entry for Week 1 is a Fidget Star, half of a Yoshimoto Cube; a Stellated Rhombic Dodecahedron with exactly half of the volume of the cube... // Hacktastic

Celebrate! First, yesterday the new version of OpenSCAD was released! Second, Saturday will be Super Pi Day: March 14, 2015. To celebrate both of these things simultaneously, today's model is a pi-flavored illusion cup that was made using some of the new features in OpenSCAD. Most people will think the cup is taller than it is around, but in fact it is shorter than its circumference. And we can prove it... // Hacktastic

This new Mesh Collector is a repository for information about the topology and geometry of triangulated meshes. It's a work in progress that I hope to add to over time, as I learn more about these things. This is the Schönhardt polyhedron, which is the simplest example of a non-tetrahedralizable polyhedron, meaning that it cannot be subdivided into tetrahedra that share its vertices... // Hacktastic

Another "Wisdom Collector" is up and running, this time about the 3D modeling and animation software Maya. I had a hard time figuring out how to get started with Maya until I got permission to sit in on a couple of classes on the subject and actually watch the instructor use the software. Even just figuring out where all the menus and buttons are is a monumental task!... // Hacktastic

I want to learn to use the JavaScript library three.js to get WebGL to render 3D animations. The trouble is, I don't know anything about JavaScript, three.js, or WebGL. Are you in the same boat? If so, then we might as well paddle together. I managed to make a spinny graphic after many days of scrutinizing code that I actually old-school printed out and read on the subway every day... // Hacktastic

This is the second in a series of posts that walk through the 3D design construction of some Polyhedral Light String Ornaments. In this step we'll scale that Snub Cube to "ornament size." Along the way we'll have a chance to learn about Tinkercad's importing, scaling, and the Ruler and Align tools. Tinkercad is one of the simplest ways to make or modify 3D models... // Hacktastic

It's time for another design walkthrough. This time we'll be making polyhedral covers for LED string-lights. Since I'm just a hack at 3D design, for me the answer always involves using a chain of software programs, each of which I know how just enough about to get by, in this case Mathematica, TopMod, and Tinkercad. Each ornament is a hollowed-out instellated Archimedean solid or dual... // Hacktastic

Do you ever get 3D prints that look stringy or lumpy? This week we were seeing a lot of weird-looking prints from one of our Replicator 2's, so we decided it was time for some holiday hardware maintenance. And wow, did it ever make a difference. After tightening a saggy X-axis belt we're back as good as new. Tightening the belt isn't difficult but it isn't much fun either... // Hacktastic

Last winter we made 3D-printed snowflakes by converting images to bitmap with Inkscape, and then extruding in Tinkercad. You can read about that on the old MakerHome blog, Days 70 and 71, or download the models from Thingiverse. The reason we made 3D snowflake models that way last year is because that was all we knew how to do. I'm somewhat wiser now, and one whole year older... // Hacktastic

Last summer we designed a series of customizable bracelets with trigonometric shapes. Today we have more general code for even crazier bracelets, including ones with oval shapes, gaps to make wrap-style instead of bangle-style, flares, low-poly sampling, and crazier trigonometric combinations. The crazy thing is that every one of the bracelets shown above was created with the same code... // Hacktastic

I swear that this blog is not going to be only about Menger sponges. However this One Last Post About Menger Sponges is about Menger sponges. Lots of them, in fact. And we're going to put our 3D-printing boots back on! Today's models are collection of Menger sponges with different Levels and slices, designed to print effectively on various types of printers... // Hacktastic

The NYC Level 3 MegaMenger sponge at MoMath is done! That makes us one of 11 locations so far that have finished a Level 3 Menger sponge as part of the worldwide MegaMenger project. At the moment at least 10 additional Level 3 sites are still in progress, as well as numerous completed Level 1 and 2 sites, which puts the project at 77.4 percent complete... // Hacktastic

Tape. It is not allowed. Origami models are traditionally made with one piece of paper (Robert Lang has some amazing examples) that is only folded - never glued, taped, or cut. Modular origami follows the same rules - no glue, tape, or cutting - but allows multiple pieces of paper (Tokomo Fuse makes beautiful modular designs). But guess what, I'm not Tokomo Fuse or Robert Lang, and neither are you... // Hacktastic

Time to level up! There are many ways to assemble a Level 2 from Level 1's. One way is to use more general forms of tripods; this is what Jeannine Mosely's Level 3 sponge project did. We need something quicker, more accessible, easier for everyone working on the project, and that really shows off fractalness. The idea we have may or may not work, but either way this has "hacktastic" written all over it... // Hacktastic

Juila sets can be realized by an inverse-iteration method which is self-correcting; wherever you start from, this process will lead you closer and closer to the Juila set, and if you make a mistake then further iterations will get you back on course. Glen Whitney had the genius idea of making a clock-like linkage that takes square roots of complex numbers to enable this inverse iteration... // Hacktastic

Today we continue our step-by-step walkthrough of building a Level 4 Menger cube out of business cards. If you want to join the fun then sign up now at www.megamenger.com. You can help with an official Level 3 build site, contribute a Level 2, be your own Level 2 mini-site, or even take part as a Level 1 micro-site. Things get interesting when you attach the cubes together... // Hacktastic

Time to begin again: new blog, new rules, and a Level 0 Menger sponge - better known as a "cube", or "hexahedron" if you're fancy. This cube is made out of six folded business cards, and it is going to join 159,999 other folded business-card cubes in the completely crazy, unreasonable MegaMenger project to build a worldwide distributed Level 4 Menger sponge... // Hacktastic