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Coraline 3D printing

Brief, but interesting article about the rapid prototyping technology used in the new stop-motion feature film Coraline. The Objet RP Polyjet technology uses photopolymer resin that is housed in cartridges and sprayed down in extremely thin 16 micron layers, four times thinner than the average human hair. As it’s sprayed... Read more »

Building a "ball mill" from junk

Spatula Tzar, who brought us the controversial fly plane, offers a number of other interested projects, including this ball mill (a device used to crush metals and chemicals into a fine powder), made from mainly junk lying around the lab. Ball Mill Read more »

An AVR-based logging wattmeter

Dan made an AVR-based logging wattmeter… He writes – This device monitors household power usage and logs it to an SD card. A simple analog front-end amplifies the signals from voltage and current detectors and an ATmega168 microcontroller computes the power consumption using the formula P=V*I. The voltage and current... Read more »

Roll your own stereo turntable

The thought never occurred to me: scratch-building your own turntable. Paulo Rebordao writes: This is a record player complete with a servo controlled arm that I’ve designed and built during the last 10 months. It has a few unusual features and I think it looks Way Cool!!! Besides some general... Read more »


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