The Raspberry Pi project that we've been fans of for quite a while now has hit a new milestone: Today, they announced that as of the last week in October, the project has sold more than two million boards. Raspberry Pi is anything but alone in the tiny, hackable computer world (all kinds of other options, from Arduino to the x86-based Minnowboard, are out there, and all have their selling points), but the low price, open-source emphasis, and focus on education have all helped the Pi catch on. If yours is one of these 2 million, what are you using it for? (And if you favor some other small system for your own experiments, what factors matter?)

Lucas123 writes "The ATF has been testing 3D printed guns over the past year and, not surprisingly, has found that depending on the thermoplastics, 3D printers and CAD designs used, some can explode on the first attempt to shoot them. The ATF published videos this week of the tests on YouTube showing what looked like a Liberator model of a 3D gun exploding upon being fired. Another model, created with the popular ABS polymer and an advanced printer, could fire as many as 8 shots. The tests were published at a time when a law passed in 1988 banning the sale of guns made entirely of plastic is set to expire next month." I hope they post the videos when they do the same tests on Solid Concepts' 1911.

Daniel_Stuckey writes "At the start of this year, President Obama nicely summed up the grandiose promise of 3D printing — or rather, the hype surrounding it. In his State of the Union address the president suggested the fledgling technology could save manufacturing by ushering in a second industrial revolution. That shout-out inspired a spate of buzzkill blog posts pointing out — rightly enough — that despite its potential, 3D printing is still in its infancy. It's not the panacea for the struggling economy we want it to be, at least not yet. Apparently the naysayers weren't enough to kill the 3D-printing dream, because, with support from the federal government, MakerBot announced its initiative to put a 3D printer in every school in America. The tech startup and the administration are betting big that teaching kids 3D printing is teaching them the skills they'll need as tomorrow's engineers, designers, and inventors." Caveat: Makerbot no longer produces open hardware, and they are pushing proprietary Autodesk software and educational materials as part of the free 3D printer. Makerbot also launched a call for open models of math manipulatives on Thingiverse (you might remember them from elementary school) so that teachers have something useful to print immediately.

Nerval's Lobster writes "Researchers have demonstrated a technique that produces inexpensive, functional electrical circuits that can be printed using about $300 worth of materials and equipment, including generic inkjet printers. The technique, developed by researchers from Georgia Tech, the University of Tokyo and Microsoft Research, allows circuits to be printed onto irregularly-shaped materials or almost anything able to go through the paper feed on a printer designed for consumers. The chief advantage of the technique is the ability to print circuits using silver nanoparticle ink rather than relying on the thermal-bonding technique called sintering, which is time-consuming and can destroy delicate base materials. Researchers were able to print new circuits in about 60 seconds on almost any material that could go through the printer, though resin-covered paper, PET film and glossy photo paper worked best, while sheets of canvas cloth and anything magnetic were ineffective. Once printed using silver ink on flexible base material, the circuits can be attached to existing hardware by simply laying or taping them in place and making connections using conductive tape or conductive glue. (Soldering would destroy the underlying material.)"

First time accepted submitter 192_kbps writes "Mike Clements, a long-haul trucker from West Jordan, Utah, built the largest amateur telescope ever with a whopping 70 inch primary mirror he purchased at auction. The entire telescope is 35 feet tall, 900 pounds, and he hopes to tour it in parks. As a hand-turned Dobsonian the telescope lacks the photographic capacity and tracking required for professional astronomy but the views must be breathtaking." (Are there other compelling candidates out there for "largest amateur telescope ever"? The 71" scope listed by nitesky.org appears to be dormant.)

alphadogg writes "The equipment is big and expensive, with the research costs at almost $500,000. But by just using retail components, Chinese professor Chi Nan has built her own Li-Fi wireless system that can use LED lights to send and receive Internet data. "I bought the lights from Taobao," she said, referring to the Chinese e-commerce site. The professor from Fudan University showed off the technology on Tuesday at the China International Industry Fair in Shanghai. Unlike traditional Wi-Fi routers that use radio signals, Chi's system relies on light to send and receive data wirelessly. Others scientists, especially in the U.K., have also been researching the technology, and dubbed it "Li-Fi". But rather than develop specialized hardware, Chi bought off-the-shelf retail parts to create her system."

rtoz writes "Motorola has announced 'Project Ara,' afree and open hardware platform for smartphones. The purpose of Project Ara is to create a modular smartphone that would allow users to swap hardware components according their own wish. The design for Project Ara consists of an endoskeleton (endo) and modules. The endo is the structural frame that holds all the modules in place. A module can be anything, from a new application processor to a new display or keyboard, an extra battery, a pulse oximeter — or something not yet thought of." Motorola's not the first one to think of such a thing; this project is in cooperation with Phonebloks, which had already been pushing for reusable, reconfigurable phone components.

schwit1 writes "Like something out of a Robert Heinlein novel, students at the University of California, San Diego (UCSD) have built a metal rocket engine using a technique previously confined to NASA. Earlier this month, the UCSD chapter of the Students for the Exploration and Development of Space (SEDS) at the Jacobs School of Engineering conducted a hot fire test for a 3D-printed metal rocket engine at the Friends of Amateur Rocketry launch site in California's Mojave Desert. This is the first such test of a printed liquid-fueled, metal rocket engine by any university in the world and the first designed and printed outside of NASA."

An anonymous reader writes "My wireless router just died. I have an old netbook lying around that has a wired network interface and a wireless one. The wireless card is supported in master mode by Linux, FreeBSD, and OpenBSD. What does Slashdot recommend I use to turn it into a router/wireless access point? DD-WRT? pfSense? Smoothwall? Fedora/Ubuntu/OpenBSD with a manual configuration? I'm not afraid of getting my hands dirty and I know what I'm doing, but I want as close to zero maintenance as possible."

That things are bigger in Texas is sometimes more than just a cliche. A few weeks ago, on the way to LinuxCon, I stopped by what is certainly the biggest hackerspace that I've ever seen; is it the biggest in the world? Whatever the answer is to that, Houston's TX/RX Labs is not just big — it's busy, and booked. Unlike some spaces we've highlighted here before (like Seattle's Metrix:CreateSpace and Brooklyn's GenSpace), TX/RX Labs has room and year-round sunshine enough to contemplate putting a multi-kilowatt solar array in the backyard. Besides an array of CNC machines, 3-D printers, and both wood- and metal-working equipment, TX/RX has workbenches available for members to rent. (These are serious workspaces, made in-house of poured concrete and welded steel tubing.) Member Steve Cameron showed me around, but TX/RX Labs is so large that we broke the tour into two parts, with the other one set to display next week.

MojoKid writes "3D Printing start-up Ultimaker announced its second generation printer, the Ultimaker 2. The new printer features significant redesigns from the first iteration of the Ultimaker. The company says that the new machine is more accurate, more efficient, and it's even quieter at 49dB. Specifically, the Ultimaker 2 has a new CNC-milled case (that's all white with glowing sidewalls) with an OLED display, and its glass and aluminum build platform is designed to cool quickly so you can peel completed projects off more easily. The Ultimaker 2 can print with multiple materials, including PLA, ABS, and PVA, and is WiFi-compatible so you can print from a mobile device or computer. Ultimaker is also launching its Cura open source software, which the company claims can pre-process 3D files some 60 times faster than other open source applications and makes it easy to load and work with 3D files."

MTorrice writes "By attaching a lightweight, inexpensive device to the back of a smart phone, scientists can convert the phone into a sensitive fluorescence microscope. The attachment [paper abstract] allows the phone's camera to take pictures of single nanoparticles and viruses, possibly providing a portable diagnostic tool for health care workers in developing countries. For example, doctors in remote regions could use the technique to measure HIV viral loads in patients' blood samples, allowing the doctors to easily monitor disease progression and determine the best course of treatment."

The popular Cyanogen Mod distribution of the Android Open Source Project dropped a bombshell today: the founding members have formed a corporation (currently with a team of seventeen hackers) to work on the project with the founder of Boost Mobile as the CEO. Quoting the announcement: "You have probably seen the pace of development pick up drastically over the past few months. More devices supported, bigger projects such as CM Account, Privacy Guard, Voice+, a new version of Superuser, and secure messaging. We vastly improved our infrastructure. We’re doing more bug fixes, creating more features, and improving our communication. We think that the time has come for your mobile device to truly be yours again, and we want to bring that idea to everybody. ... So what does this all mean for the community? The first thing I wanted to do when I realized we were actually doing this, was tell everyone possible. But when starting a company, you have to think about the larger picture. This meant not announcing until the time was right, our house was in order and we would have something to show. I have seen open source projects come and go, some being bought out and closed, others stagnating and falling by the wayside. I don’t want to see this happen with CM."

An anonymous reader writes "A few months after releasing support for viewing models in .STL format, GitHub just added support for viewing changes to .STL formatted 3D models directly in the browser. 'How does this work? We take both versions of the model, and using binary space partitioning, we compute the added, removed, and unchanged parts. This is done using csgtool, a C library paired with a Ruby gem via FFI. These pieces are cached and displayed by the 3D viewer we already have, though we color them differently and play with their transparency to help illustrate the changes.'"

coop0030 writes "Adafruit has a new tutorial that will show you how to use your Raspberry Pi as a WiFi access point that blocks ads by default for any devices using it. This is really neat in that it would work for your Android or iOS device, your Xbox 360, TiVo, laptop, and more without needing to customize any of those devices other than to use your Raspberry Pi as the access point for WiFi. Using an ad-blocker can be useful for conserving bandwidth, helping out low-power devices, or for keeping your sanity while browsing the web!"

An anonymous reader writes "Using a Lego Mindstorms set, a Mac, and optical character recognition, Austrian professor Peter Purgathofer created a makeshift ebook copier. From the article: 'It's sort of a combination of high tech meets low. The scanning is done by way of the Mac's iSight camera. The Mindstorms set does two things: Hits the page-advance button on the Kindle (it appears to be an older model, like the one in the picture above), then mashes the space bar on the Mac, causing it to take a picture.' Purgathofer calls the creation a 'reflection on the loss of long established rights.' Check out the Vimeo video for a demonstration."

An anonymous reader sends this news from the Wall Street Journal: "A 19-year-old model helicopter enthusiast was killed Thursday when a toy helicopter he was flying struck him in the head, a law-enforcement official said. Victim Roman Pirozek 'was known to be aggressive in his flying and often executed tricks. He was executing a trick when he was struck,' the official said. Mr. Pirozek – depicted in [this YouTube video] he posted in July — was flying a remote-controlled helicopter worth about $2,000 when it struck him, cutting off the top of his head, the official said. The Woodhaven, Queens, resident was pronounced dead at the scene. His father was with him at the time of the accident, the official said."

In August Phil Shapiro wrote an article that asked the question, Can 50 Closed Chicago Schools Become 50 Makerspaces? Now, in September, we have a ruminative interview with him about schools, makerspaces, and how making places where kids (and adults) can make things and generally tinker with tools and get used to the idea of working with their hands to create new things and to repair old ones. For many of us in previous generations, our "makerspace" was our garage or basement, and our mentor was Dad. Today, this doesn't seem to be the case in a lot of homes. Besides, working with others is safer than working alone, and even if we bowl alone there is no good social or biological reason for us to create alone -- especially if we have a congenial makerspace nearby.

An anonymous reader notes that Skype is reportedly working on a 3D version of its messaging application. As reported by the BBC, an unnamed senior executive says that rumors to this effect are true. However, don't get too worked up about sending your avatar to school or to work just yet: Microsoft's corporate vice-president for Skype, Mark Gillett, says that "the capture devices are not yet there. As we work with that kind of technology you have to add multiple cameras to your computer, precisely calibrate them and point them at the right angle. ... We have it in the lab, we know how to make it work and we're looking at the ecosystem of devices and their capability to support it in order to make a decision when we might think about bringing something like that to market." Also at SlashBI.

cartechboy writes "Two Ph.D. students from MIT have created a keyboard accessory, the Pavlov Poke, that shocks you every time you go onto Facebook. The project comes as a result of the students finding the waste over 50 hours a week combined on the social network (instead of working on their dissertations) So the pair created an Arduino-based keyboard hand-rest that shocks computer users who spend too much time checking the social network. The hack is 'intended to generate discussion' — not actually turn into a business." Inventor Robert Morris describes it as "something of a joke," but I'm sure there's a market out there.