Infinity Icosahedron Is Difficult To Contemplate Even Looking Right At It

Cubes and pyramids are wonderful primitive three-dimensional objects, but everyone knows that the real mystical power is in icosahedrons. Yes, the twenty-sided polyhedron does more than just ruin your saving throws in tabletop RPGs – it can also glow and look shiny in your loungeroom at home.

[janth]’s build relies on semitransparent acrylic mirrors for the infinity effect, lasercut into triangles to form the faces of the icosahedron. The frame is built out of 3D printed rails which slot on to the acrylic mirrors, and also hold the LED strips. [janth] chose high-density strips with 144 LEDs per meter for a more consistent effect, and added frosted acrylic diffusers to all the strips for a clean look with less hotspots from the individual LEDs.

An ESP32 runs the show, and the whole assembly is epoxied together for strength. The final effect is very future disco, and it’s probably against medical advice to stare at it for more than 5 minutes at a time.

The infinity effect is a popular one, and we’ve seen a beautiful cube build by [Heliox] in recent times. Of course, if you do manage to build an actual portal through time and space, and not just a lamp that looks like one, be sure to send us a tip. Video after the break.

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Foldable Dymaxion Globe

Some time back, we posted about [Gavin]’s laser-cut/3D printed Dymaxion Globe — if you haven’t read about it yet, you should check it out. [noniq] loved the idea, and like a true hacker, built and shared an improved Foldable Dymaxion Globe. It can snap together to form an icosahedron globe, or it can be laid flat to form a map.

Duct tape, stoppers and magnet holders
Duct tape, stoppers and magnet holders

Like the original, [noniq]’s version is laser cut and engraved, and uses some 3D printed parts. But it does away with the fasteners (that’s 60 pairs of nuts and bolts), and instead uses neodymium magnets to make all the triangle pieces snap together to form the icosahedron globe. The hinges are simply some pieces of gaffer-tape.

This design improvement creates a cleaner globe and also addresses some of the concerns posted in the comments of the earlier build. The design files are available for download on [noniq]’s blog — you need to 3D print some magnet holders and stopper plates, and laser cut the 20 triangle tiles. The stopper plates help ensure that the angle between tiles when it is put together is limited to 138 degrees, making it easier to assemble the globe.

Check out the video after the break to hear the satisfying “thunk” of neodymium magnets snapping together.

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IcosaLEDron: A 20-Sided Light Up Ball

Tired of balls that are just balls, and not glowing geometric constructions of electronics and wonderment? Get yourself an IcosaLEDron, the latest in Platonic solids loaded up with RGB LEDs.

The folks at Afrit Labs wanted a fun, glowy device that would show off the capabilities of IMUs and MEMS accelerometers. They came up with a ball with a circuit board inside and twenty WS2812B RGB LEDs studded around its circumference

The frame of the ball is simply a set of twenty tessellated triangles that can be folded up during assembly. The outer shell of the ball is again printed in one piece, but fabricated out of transparent NinjaFlex, an extraordinarily odd, squishy, and likely indestructible material.

Inside the IcosaLEDron is a PCB loaded up with an ATMega328p, an accelerometer, a LiPo battery charger, and quite a bit of wiring. Once the ball is assembled and locked down, the squishy outer exterior is installed and turned into a throwable plaything.

If 20 sides and 20 LEDs aren’t enough, how about a an astonishing 386-LED ball that’s animated and knows its orientation? That’s a project from Null Space Labs, and looking at it in person is hypnotic.

via Makezine

Disco icosahedron rings in the new year

While city engineers were setting up the multicolored ball of lights in Times Square this year, [Phil] at adafruit was busy designing the X2 Time Ball, a disco icosahedron perfect for celebrating the new year.

The ball is made of 20 acrylic triangles zip-tied together into an icosahedron. On each face, six RGB pixels light up via commands from an Arduino. The entire project is able to be controlled remotely thanks to the help of a pair of XBees. [Phil] whipped up a Processing sketch to control the LED ball any way we could possibly imagine.

Although it may be a little late to build an LED disco ball for this year’s New Year’s Eve party, that doesn’t mean we couldn’t use it the other 364 days of the year. It’s perfect for parties, weddings, and our weekly lightswitch raves. Check out the action video of the Time Ball after the break.

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