Your Open-Source Client Options In The Non-Mastodon Fediverse

May 8, 2024 by 14 Comments

When things started getting iffy over at Twitter, Mastodon rose as a popular alternative to the traditional microblogging platfrom. In contrast to the walled gardens of other social media channels, it uses an open protocol that runs on distributed servers that loosely join together, forming the “Fediverse”.

The beauty of the Fediverse isn’t just in its server structure, though. It’s also in the variety of clients available for accessing the network. Where Twitter is now super-strict about which apps can hook into the network, the Fediverse welcomes all comers to the platform! And although Mastodon is certainly the largest player, it’s absolutely not the only elephant in the room.

Today, we’ll look at a bunch of alternative clients for the platform, ranging from mobile apps to web clients. They offer unique features and interfaces that cater to different user preferences and needs. We’ll look at the most notable examples—each of which brings a different flavor to your Fediverse experience.

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Remembering Dick Rutan And His Non-Stop Flight Around The World

May 8, 2024 by 5 Comments

On December 23, 1986, an airplane landed at Edwards AFB. This by itself wouldn’t mean much, but this particular airplane had just written history. Piloted by Dick Rutan and Jeana Yeager, the Rutan Model 76 Voyager had just completed its non-stop flight around the world after taking off from that very same runway just over nine days prior. Designed by Dick’s younger brother Burt Rutan, this airplane and this one flight will forever speak to the world’s imagination, even as we say farewell to Dick “Killer” Rutan.

Dick Rutan (r) and Jeana Yeager (l) standing next to the Voyager aircraft in 1986. (Source: Ray Kamm collection)
Dick Rutan (r) and Jeana Yeager (l) standing next to the Voyager aircraft in 1986. (Source: Ray Kamm collection)

Born Richard Glenn Rutan on July 1, 1938, he spent his military career in the United States Air Force, initially working with radar systems before beginning pilot training in the 1960s. He flew 325 sorties over Vietnam (ejecting once) and served for many more years while racking up many awards and reached the rank of Lieutenant Colonel before retiring in 1978.

After this he would fly as a test pilot for a range of aircraft, including a modified Rutan Long-EZ: the XCOR EZ-Rocket in 2001. Yet no flight would be as memorable as the record-breaking flight in the Rutan Voyager, which saw the world’s media following the aircraft’s journey around the globe, including with live feeds whenever the aircraft was within reach of national broadcasters. Despite nine days of strenuous flight and some mechanical breakdowns and damaged wingtips (from the fuel-burdened wings scraping over the runway), the flight went about as well as could have been hoped, thanks to Dick’s and Jeana’s piloting skills.

Dick Rutan died on May 3, 2024 at the age of 85 after a long struggle with the consequences of Long COVID. He will be sorely missed by the aviation community and countless others, but his achievements never forgotten.

3D Printed Fidget Knife Snaps Back And Forth All Day Long

May 8, 2024 by 26 Comments

Fidget toys all have a satisfying mechanical action to engage with, and [uhltimate]’s OTF (out the front) “fidget knife” model provides that in spades. The model snaps open and closed thanks to a clever arrangement of springs and latches contained in only three printed pieces.

Here’s how it works: at rest, the mock blade (orange in the image above) is latched in the closed position. As one presses the slider forward, the bottom spring begins to pull up against the blade until it moves far enough to release the latch. When the latch is released, the tension built up in the spring propels the blade outward where it again latches in the open position. Retraction is the same essential process, just in the opposite direction (and using a latch on the opposite side of the blade, which faces the other direction.)

As you may imagine, effective operation depends on the material. The model is designed to be printed in PLA, but [uhltimate] also provides a part variation with a stiffer spring for those who find that basic model isn’t quite up to the task for whatever reason. Smooth surfaces are also helpful for hitch-free operation, but lubrication shouldn’t be necessary.

If this sort of thing is up your alley, don’t miss the satisfying snap action of this 3D printed toggle mechanism, either!

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Mostly Printed CNC Gets A Few Upgrades

May 7, 2024 by 8 Comments

The Mostly Printed CNC is famous for two things. First, being made mostly from 3D printed parts and commonly available steel tubing. Second, because of the materials used, its rigidity isn’t fantastic. But any CNC router is better than no CNC router, and [Alan Reiner]’s “Mostly Mostly Printed CNC” upgrades the base MPCNC into a much more capable unit.

MPCNC purists may want to look away, as the video below shows [Alan] committing the heresy of adding linear rails to his machine. The rails were sourced from VEVOR and at less than $100 for 10 meters, it must have been hard to resist. The rigidity wasn’t amazing — witness the horrific chatter at around the 5:15 mark — but [Alan] sorted that out with some aluminum extrusion and printed adapters.

Those upgrades alone were enough to let [Alan] dive into some aluminum cutting, but he also wanted to address another gripe with his base build: the Z-axis backlash. The fix there was to add another lead screw nut on an adjustable carrier. By tweaking the relative angles of the two opposed nuts, almost all of the backlash was taken up. [Alan] also replaced the motor coupling on the Z axis with a Lovejoy-style coupler, to remove as much axial compliance as possible.

Along with the motion control mods, [Alan] improved work holding and added an enclosure to tame the chip beast, along with some upgrades to the control electronics. The results are pretty good and appear well worth the modest added expense. Maybe a wireless controller can be next on the upgrade list?

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Mitre Wants The Feds To Play In Its Sandbox

May 7, 2024 by 18 Comments

If you haven’t worked with the US government, you might not know Mitre, a non-profit government research organization. Formed in 1958 by the U.S. Air Force as a company to guide the SAGE computer, they are often research experts who oversee government contracts or evaluate proposals. Now they are building a $20 millon “AI Sandbox” for the Federal government to build AI prototypes.

Partnered with NVidia, the sandbox will use an NVidia GDX SuperPOD system capable of an exaFLOP of 8-bit AI computation. Mitre reports this will increase their compute power for AI by two orders of magnitude.

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Your Pi, From Anywhere

May 7, 2024 by 16 Comments

The Raspberry Pi finds a use in a huge variety of applications, and in almost any location you could imagine. Sadly those who use those machines might not be in the same place as the machines themselves, and thus there’s the question of providing a remote connection between the two. This may not be a huge challenge to those skilled with Linux and firewalls, but to many Pi users it’s a closed book. So the Pi folks have come up with a painless way to connect to your Pi wherever it is, and it’s called Raspberry Pi Connect.

To use the service all you need is a Pi running the latest 64-bit version of Raspberry Pi OS, so sadly that excludes base model Zeros and older models. Sign in to the Raspberry Pi Connect server, follow the instructions, and you’re on your way. Under the hood it’s the well-known VNC protocol at work, with the connection setup being managed via WebRTC. The Pi servers are intended to act simply as connection facilitators for peer-to-peer traffic, though they are capable of handling through traffic themselves. It’s a beta service with a single server in the UK at the time of writing, though we’d expect both the number of servers and the offering to evolve over time.

We think this is a useful addition to the Pi offering, and we expect to see it used in all manner of inventive ways. Meanwhile it’s a while since we had a look at connecting to a headless Pi, but much of the information is still relevant.

Z80s From The ’80s Had Futuristic Design

May 7, 2024 by 23 Comments

Ever heard of a Dutch company called Holborn (literally, born in Holland)? We hadn’t either, but [Bryan Lunduke] showed us these computers from the early 1980s, and we wondered if they might have appeared in some science fiction movies. They definitely look like something from a 1970s movie space station.

The company started out tiny and only lasted a few years. The Holborn 9100 looked like a minicomputer and, honestly, other than the terminal, looks more like an air conditioner or refrigerator. While it was a Z-80 system, it was clearly aimed at business. The processor ran at 3.5 MHz, there was 72K of RAM that could expand to 220 K — a whopping amount for the early ’80s. They also could accept loads of 8-inch floppies. It even had a light pen, which seems exotic today but was actually fairly common back then.

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