All posts by Windell Oskay

About Windell Oskay

Co-founder of Evil Mad Scientist Laboratories.

A few more sugar sculptures

Sugar Soliton

This is a rendering of the sculpture Soliton by Bathsheba Grossman, as output by the CandyFab 4000; it’s a three-dimensional form made out of pure sugar. Seeing Bathsheba’s sculptures at the 2006 Maker Faire was the inspiration for us to build the machine in the first place, so it’s quite exciting to be able to print this. (The design is used by her kind permission– please buy some of her sculptures!)

This is our second try at fabbing this difficult shape. Our first attempt was at a somewhat smaller size and ran into trouble with the thin beams when *one* of our thin horizontal layers turned out to be too weakly bonded. To avoid a second failure, we enlarged the model but also ran the heater element very hot and for an extended period of time to make the pixels srong, but also larger, more rounded, and richer in color– a darker caramel.

In this view we’re looking right down at the printed layers of sugar; we think that the grain of the layers makes this look a lot like a wood carving.

Of course, that’s not all that we’ve been printing this week. Here is one more large-scale object that we made:

mobius monster

The shape is a 3/4 twist mobius strip with a square cross section and windows cut at regular intervals in all of the sides the side. Even though it’s hollow, it still weighs seven pounds and fourteen ounces– that’s a lot of sugar. We’re bringing this monster to Maker Faire this weekend, so you can see it for yourself, too.

Maker Faire 2007 is this weekend

Maker Faire 2007 is this coming weekend, May 19-20, in San Mateo, CA. We’ll be bringing the CandyFab 4000 to show off. Besides the CandyFab, we also have one or two (or maybe even three) other projects at the Maker Faire, depending on how you count, which we’re scurrying to (1) finish up and (2) document sometime this week.

Consequently, our publishing schedule will continue to be a little wonky for the next week– so little to do so much time and all that! So, stay evil and come meet us at the Maker Faire!

Solid freeform fabrication: DIY, on the cheap, and made of pure sugar

CandyFab Sign

In February we gave a sneak preview of our project to construct a home-built three dimensional fabricator. Our design goals were (1) a low cost design leveraging recycled components (2) large printable volume emphasized over high resolution, and (3) ability to use low-cost printing media including granulated sugar. We are extremely pleased to be able to report that it has been a success: Our three dimensional fabricator is now fully operational and we have used it to print several large, low-resolution, objects out of pure sugar.

Coil Screw, dodecahedron

Continue reading Solid freeform fabrication: DIY, on the cheap, and made of pure sugar

I want this toy.

I’ve always been a big fan of marble runs, starting with the Gravitram in Portland, Oregon (pictures), all the way up to the modern marvels like this one by Matthias Wandel. While I’ve been dreaming about making my own amazing machine, a toy company in the UK has gone ahead and made it easy. Take a look at this amazing line of Techno-Ball sets by Cheatwell Games– in sizes from a diminutive 173 pieces to the 920 piece monster pictured here– with two independent motorized marble-lifting chains. (I want the big set. Maybe two.)

It looks like these are easy to get in the UK, even from Amazon.co.uk, but it’s not obvious that they’re even for sale in the states.

So, I’d like to ask: does anyone know where I can order a set (or two)?

Update:

A reader left a comment about Steve Jackson’s Chaos Machine— a giant ball-run construction toy that he brings to conventions. It’s apparently so cool that it has its own fansite.

The Chaos Machine is made out of a number of Chaos Tower sets from chaostoy.com. The sets can be built in a number of configurations, like the six-foot-tall one pictured to the left. This looks like a really fabulous construction system– enough so to change my mind about which set to get! The tracks look a lot nicer than the ones in the techno-ball set, and it has all the features of “real” marble runs: trampolines and catchers, vortices, switches, accumulators, a series of tubes, and probably more that I can’t see in the photos.

So… can anyone beat that?

Laying out printed circuit boards with open-source tools

There has historically been, and still is, a lack of good, free MacOS native EDA (electronic design automation) software. The situation has somewhat improved in the past few years because the X11 layer in Mac OS X allows graphical unix applications to run natively on the Mac, concurrently with other programs. I recently learned to use some of these tools in the gEDA suite to lay out printed circuit boards. These (loosely, if at all, organized) notes should be helpful to anyone that wants to get started making PCBs using a mac, linux, or other unix-like system.
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Reminder: Intro microcontroller class tomorrow (Saturday)

Reminder: This Saturday, April 21, I’ll be giving a seminar at TechShop that’s an introduction to microcontrollers, called Choosing a Microcontroller. This is designed to be an introduction to the capabilities and variety of single-chip computers, as well how to actually pick one for a given application. It’s easy to get overwhelmed looking at the variety of range of micros, from four-bit micros that have a 4-bit wide data path — and actually cost four bits— to AVRs and PICs, basic stamps and Arduinos, to 32-bit gorillas with names like ARM, Blackfin, and Coldfire. So, we’ll try and cut through the fog and help you figure out where to get started.

If you’ve heard people getting excited about or doing cool things with microcontrollers and want to learn more, this might be a great introduction to the field.
Sign up for this and other TechShop classes here!

[Related: EvilMadScientist Microcontroller Projects]

Resources for choosing a microcontroller

ATtiny2313 I’ve put together a short list (after the jump) of some potentially useful resources that may be of help in choosing a microcontroller for your project, or just getting started with microcontrollers in general. I plan to add to this list from time to time. If you have other suggested resources to add to the list, please feel free to leave them in the comments here– good suggestions may be incorporated into future revisions of the list.

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