Kritik sah

Unlike resin printers where you generally just pour the fresh resin into the easily accessible vat, FDM printers need to squirrel away at least one spool and its requisite holder somewhere. For bed slingers this generally means a top-mounted spool holder, while for CoreXY enclosed printers they can appear on the sides, top or – inexplicably – on the back. While a side-mounted spool is often convenient, access to the side can still be blocked, in which case you do what [3D Maker Noob] did and over-engineer a fancy top-mounted spool holder . The problem started after converting a Prusa Mk4S to a Core One using the conversion kit, which changes the position of the spool, forcing him to work around not having access to the right side of the machine where the default position is. After a first version using many of the left-over parts of the original Mk4S to create a fancy box-shaped spool holder, he proceeded to upgrade it as detailed in the video. All project files and instruc...

It’s become an accepted truth amongst tapeheads that there’s no point looking at new hardware, because there’s only one tape mechanism being made anywhere in the world anymore, and that it sucks. [VWestlife] may enjoy German automobiles, based on the name, but he’s also a tapehead– and he took the time to demonstrate on YouTube that the accepted truth just ain’t so . The supposed One Mechanism to Rule Them All in Lo-Fi is designed or made by Chinese company Tanishin. Certainly Tanishin does make a tape mechanism, but as [VWestlife] demonstrates with a few teardowns, there’s absolutely more than one on the market. That doesn’t mean any of the new offerings will out-compete your vintage Sony Walkman, but it does mean there are differences worth considering if you were to buy new. Note that it is handhelds like the Walkman being talked about– it must be, since there are both slot-loading and flip-loading decks still being made, and e...

Although the thought of installing a modern operating system like Windows 11 on something as archaic as a Core 2 Quad Q6600 Intel CPU may seem ridiculous, it being the flagship CPU of the time means that it still chews up low-end Celeron systems that are on the supported hardware list like the N4020. Hence [Omores] commencing on this latest adventure , with the snag being that the chosen mainboard features an AGP bus that Windows 11 no longer supports. A GPU box from the related HD 4670 PCIe card, not the used HD 4650 AGP card with 1 GB of DDR2. This system is intended to multi-boot a range of Windows OSes starting with Windows 98, while also playing nice with DOS and even Windows 11. In addition to the quad-core, 2.4 GHz Q6600 there’s also an amazing 3 GB of DDR1 RAM in the system. The mainboard is the 2003-era Asrock 865PE, with the GPU being the highest-end GPU that still came in AGP flavor: the Radeon HD 4650 from 2009. Since the sole reason that Windows 11 doesn’t su...

While it might seem that your computer malfunctions every few minutes, the reality is that modern computers are usually quite robust. Not so much for quantum computers, where qubit life is often measured in milliseconds. Now, the company claims to have  qubits that last for about 20 seconds . For example, Microsoft’s Majorana 1 quantum chip, which, incidentally, was mired in controversy , provided 8 qubits that were stable very briefly. This second-generation chip provides 12 qubits that average 20-second lifespans. Microsoft claims to use topological superconductors based on Majorana modes. However, despite claims, some researchers think the technology is using Andreev modes and does not contain any Majorana modes, although this is apparently debatable. Despite retracting an earlier paper, the company appears to stand by its claim that it is producing Majorana fermions . The biggest problem, of course, is that to be practical, you will need millions of qubits instead of 8 or ...

Some security hacks require someone to have physical access to your computer. In many cases, that’s easy to mitigate. Other attack vectors can put you at risk from anywhere via the network. That’s what firewalls are for. But there is an in-between risk where an attacker just has to be “around” your computer. [Rasmus Moorats] found out that a Creative Sound Blaster sound bar could open up just such an attack . [Rasmus] was poking around the firmware just to write custom software to control it. The possibility of an attack was just an accidental find. The soundbar connects to USB, but it also has Bluetooth, which, for some reason, is always on. There’s an app that can communicate with the speaker using BLE, and Creative has a special protocol to control it. The same protocol works on USB or Bluetooth, but with an important difference. On USB, you have to authenticate to send commands. However, you can easily decompile the provided apps and learn the authe...

Adding magnets to a 3D print can be very useful in a design, but there are some things that can trip you up if you’re not away of them. In a recent video by [Lost in Tech] some of the essentials are covered, including why you shouldn’t get magnets near most extruder nozzles or the printing bed. The easiest method is of course to add magnets in after printing, using friction fit with or without ribs, or with a dab of glue. Here making sure that the magnet stays in place is the trick, as you do not want the magnet to get lost or end up in the tummy of a curious pet or toddler. The magnetic pattern on an FDM printer’s magnetic bed. Things get spicy when you’re talking about adding magnets during the printing process, as some extruders are made of a ferromagnetic material and thus a magnet will happily stick to said nozzle if it’s not pure brass or similar. As seen in the video even some purported ‘brass’ nozzles aren’t pure enough to not ...