In the video game Metro 2033 and its subsequent sequels, players fight their way through a post-apocalyptic version of Russia using improvised weapons and tools cobbled together from the sort of bits and bobs the survivors of a nuclear war might be able to scavenge from the rubble. One of the most useful devices in the game is known as the “Universal Charger”: a hand-operated dynamo that the player must use periodically recharge their electrical devices.
As demonstrated in the video after the break, his charger manages to produce enough energy to light an LED on each squeeze of the trigger. Though if we were packing our gear to go fight mutated beasties in alternate-future Moscow, we might look for something with a bit more kick.
Beyond the 3D printed parts, the charger uses a couple short pieces of 8 mm rod, a NEMA 17 stepper motor, and a one-way bearing that’s usually used for pull starting small gasolene engines.
An issue in Unix virtual private networks was disclosed recently, where an attacker could potentially hijack a TCP stream, even though that stream is inside the VPN. This attack affects OpenVPN, Wireguard, and even IPSec VPNs. How was this possible? Unix systems support all manner of different network scenarios, and oftentimes a misconfiguration can lead to problems. Here, packets sent to the VPNs IP address are processed and responded to, even though they are coming in over a different interface.
The attack initially sounds implausible, as an attacker has to know the Virtual IP address of the VPN client, the remote IP address of an active TCP connection, and the sequence and ACK numbers of that connection. That’s a lot of information, but an attacker can figure it out one piece at a time, making it a plausible attack. Continue reading “This Week In Security: VPNs, Patch Tuesday, And Plundervault”→
Let’s be clear right up front: there are probably more obvious solutions to the problem of using a Russian calculator when you don’t speak Russian than printing new keys and engraving translated markings on them. But easy solutions are boring and generally considered beyond the scope of Hackaday articles, so let’s dive in.
They say that mathematics is the universal language, but that’s only true to an extent. Still, even with our limited non-existent Cyrillic skills, the Russian keyboard on this RPN calculator isn’t that hard to figure out. But as [Amen] points out, in the midst of fevered calculations, one prefers not to mentally translate Χ→П to STO or remember that В↑ is the Enter key. So he printed a set of replacements for the confusing keys from PLA. While pondering how to safely fixture such small parts for the later engraving step, [Amen] hit on a genius solution: move the print bed to the CNC router and fixture everything in one go. The resulting characters are large enough to be legible and deep enough to be filled with air-drying polymer clay for contrast. After sanding and polishing, the calculator looks like it came from the Министерство электронной промышленности that way.
We sometimes forget that 3D printers are just CNC platforms with a hotend attached, and there a whole range of alternative tool heads to use. [Jón Schone] has been doing exactly that, and needed a way to quickly disconnect his hotend completely from his printer, so he 3D printed his own custom D-sub connector for both filament and wires. (Video, embedded below.)
[Jon] has added a number of upgrades for his Creality CR10 3D printer, including a quick change tool mount to allow him to also use a laser engraver and even a small spindle. When the hotend is removed there’s no way to quickly disconnect the wiring , so the print head is usually left connected and placed to one side of the printer. For a quick detach solution for both wiring and the Bowden tube, he first modified an off-the-shelf D-sub connector. The connector was relatively expensive, and the tube had a tendency to pop out, which led to some failed prints.
[Jon] wanted to use proper Bowden tube fittings inside the connector, so he designed and printed his own D-sub connector and bought loose contacts. Pushing the contacts into the housing turned out to be quite difficult to do without breaking them, so he’s working on making that process simpler. This is just one of many examples of 3D printing 3D printer upgrades, which has been a core feature of the RepRap project right from the beginning. Check out the video after the break