Technologies
Supercharge Your 3D Printer With This Must-Have Upgrade
The new Revo Six hot end from E3D is an easy way to swap in different nozzles on your 3D printer.

Almost all the best 3D Printers can be upgraded in some way with new parts and accessories. One of the most important potential upgrades is to the machine’s hot end assembly, which controls the temperature your printer prints at, and houses the nozzle that helps determine the filament flow.
The Rapidchange Revo Six is a replacement hot end for your 3D printer. It’s from E3D, a company that’s been making parts for 3D printers for years and is one of the gold standards, especially for nozzles and hot ends. This new model has really changed how I use my 3D printers and how I think about the models I’m making.
With the Revo Six, you can swap out the nozzle part of a printer’s hot end easily, which allows for lots of variation in the materials and line thickness for your project. Normally you need to remove the filament from your nozzle, heat the nozzle to loosen the threads, undo it with a socket wrench while it’s hot, then let it cool. After that, you can install your new nozzle, but you need to install it cold, then retighten it once it’s hot.
The $93 Revo Six (£77 GBP) takes out a lot of steps by making the nozzle and other parts of the printing assembly one piece and fully removable by hand. Take out your filament, immediately unscrew the nozzle, and swap it out. This saves a lot of time when replacing nozzles that’ve worn out, but the real magic is swapping different-sized nozzles for different models.
Why you want different nozzle sizes


Often the purpose of your 3D model dictates the settings you’ll use to print it. When printing something delicate with a lot of details, you need a smaller nozzle diameter. With something structural that requires strength, you need a larger diameter. Most 3D printers come with a 0.4mm nozzle as standard, which is fine as a happy medium but won’t always be enough in either direction.
The genius of the Revo Six is the ability to change nozzle sizes almost on the fly. Each nozzle size is color-coded and available from 0.15mm all the way up to 0.8mm and can be replaced in less than a minute. The $89 kit comes with a 0.4mm nozzle but the $139 fully loaded kit has four nozzles ranging from 0.25 to 0.8mm.
I’ve printed a set of brackets for a machine I needed to mount to the wall. The mount is completely hidden and layer lines don’t matter, so I used the 0.8mm nozzle to print extra thick, extra strong parts as quickly as possible (larger layer lines mean faster printing too). As soon as I’d finished the brackets, I immediately swapped the nozzles on the Revo Six to the 0.25mm one and started printing a Flower Dragon with tiny details from Fotis Mint. Having that flexibility in a single machine is fantastic. It saves money on different printers and, more importantly, saves me time, something I have very little of day-to-day.
Upgrade the upgrade with the E3D Obxidian


Like all good 3D printing accessories, even the Rapidchange Revo V6 can be upgraded. Not only did E3D produce low-cost replacement nozzles for all the different sizes you might want, they made a specialty nozzle for the exotic filaments too.
The Obxidian (pronounced obsidian, like the rock) is a nozzle from E3D that’s specially designed to help combat the wear and tear you get from using abrasive materials infused with other mediums, such as wood or carbon fiber. It’s made from copper, rather than a brass alloy, and has a special coating that helps move the fibers through the nozzle without sticking. It’s also designed to work with the Revo system for quick changing.
Buzz phrases like «the last nozzle you’ll ever need» feel hyperbolic, but at the same time, the longevity of the $59 Obxidian compared with standard nozzles — it can last indefinitely as long as you aren’t using glow-in-the-dark filament at high speed — makes me wonder if it’s even worth buying a standard Revo nozzle again. Actually, the Obxidian comes only in 0.4mm and 0.6mm diameters, so it’s worth having the other nozzle sizes around for other print jobs. Filaments with other materials in them — wood or carbon-infused PLA for example — benefit from a high flow rate, so larger nozzle sizes work better for the Obxidan. For standard prints, though, the Obxidian has everything covered.
An accessory that elevates your entire machine
All the best 3D printing accessories improve your experience in some way, but the Revo Six coupled with an Obxidian nozzle will fundamentally change how you print. Because so many manufacturers have used the E3D V6 hot end in some fashion, the company was able to create Revo Six systems that are easy to replace on a huge variety of 3D printers. From Creality to Prusa, E3D has Revo to help you convert.
I’m convinced that the Rapidchange Revo Six is the next big change to hot ends moving forward, and though I haven’t managed to convert all my 3D printers, if you have just one or two, then investing in a fully loaded kit is well worth it.
Technologies
Google I/O 2025: How to Watch Google’s Biggest Event (and What to Expect)
Google’s biggest event of the year will almost certainly be about all the ways AI will help you get stuff done.

Google’s main I/O 2025 keynote takes place on May 20, with I/O continuing over May 21 for developers to get hands-on with Google’s latest products. At its keynote, we expect Big G to talk about its various innovations across its constantly expanding suite of products and tools — no doubt with a huge focus on AI throughout. If we collectively cross our fingers, promise to be good and eat all our vegetables, then we may even be treated to a sneak peek at upcoming hardware.
Read more: Android 16: Everything Google Announced at the Android Show
Google also hosted a totally separate event that focused solely on Android. The Android Show: I/O Edition saw the wrappers come off Android 16, with insights into the new Material 3 Expressive interface, updates to security and a focus on Gemini and how it’ll work on a variety of other devices.
By breaking out Android news into its own virtual event, Google frees itself to spend more time during the I/O keynote to talk about Gemini, Deep Mind, Android XR and Project Astra. It’s going to be a jam-packed event, so here’s how you can watch I/O 2025 as it happens and what you can look forward to.
Google I/O: Where to watch
Google I/O proper kicks off with a keynote taking place on May 20, 10 a.m. PDT (1 p.m. EDT, 6 p.m. BST). It’ll be available to stream online on Google’s own YouTube channel. There’s no live link on the I/O website yet, though you can use the handy links to add the event to your calendar of choice and register your details if you want more info from Google. Which maybe you do.
What to expect from Google I/O 2025
Not much chat about Android 16: As Google gave Android 16 its own outing already, it’s likely that it won’t be mentioned all that much during I/O. In fact at last year’s event, Android was barely mentioned, while uses of the term «AI» went well over a hundred.
Android XR: Google didn’t talk much about Android XR during the Android show, focusing instead on the purely phone-based updates to the platform. We expected to hear more about the company’s latest foray into mixed-reality headsets in partnership with Samsung and its Project Moohan headset, so it’s possible that this is being saved for I/O proper.
Gemini: With Android being spun out into its own separate event, Google is evidently clearing the way for I/O to focus on everything else the company does. AI will continue to dominate the conversation at I/O, just as it did last year (though hopefully Google can make it more understandable) with updates to many of its AI platforms expected to be announced.
Gemini is expected to receive a variety of update announcements, including more information on its latest 2.5 Pro update which boasts various improvements to its reasoning abilities, and in particular to its helpfulness for coding applications. Expect lots of mentions of Google’s other AI-based products, too, including DeepMind, LearnLM and Project Astra. Let’s just hope Google has figured out how to make this information make any kind of sense.
Beyond AI, Google may talk about updates to its other products including GMail, Chrome and the Play Store, although whether these updates are big enough to be discussed during the keynote rather than as part of the developer-focused sessions following I/O’s opening remains to be seen.
Technologies
Want to Speak to Dophins? Researchers Won $100,000 AI Prize Studying Their Whistling
The scientists studied a bottlenose dolphin community in Sarasota, Florida, uncovering evidence of language-like communications.

If any dolphins are reading this: hello!
A team of scientists studying a community of Florida dolphins has been awarded the first $100,000 Coller Dolittle Challenge prize, set up to award research in interspecies communication algorithms.
The US-based team, led by Laela Sayigh of the Woods Hole Oceanographic Institution, found that a type of whistle that dolphins employ is used as an alarm. Another whistle they studied is used by dolphins to respond to unexpected or unfamiliar situations. The team used non-invasive hydrophones to perform the research, which provides evidence that dolphins may be using whistles like words, shared with multiple members of their communities.
Capturing the sounds is just the beginning. Researchers will use AI to continue deciphering the whistles to try to find more patterns.
«The main thing stopping us cracking the code of animal communication is a lack of data. Think of the 1 trillion words needed to train a large language model like ChatGPT. We don’t have anything like this for other animals,» said Jonathan Birch, a professor at the London School of Economics and Politics and one of the judges for the prize.
«That’s why we need programs like the Sarasota Dolphin Research Program, which has built up an extraordinary library of dolphin whistles over 40 years. The cumulative result of all that work is that Laela Sayigh and her team can now use deep learning to analyse the whistles and perhaps, one day, crack the code,» he said.
The award was part of a ceremony honoring the work of four teams from across the world. In addition to the dolphin project, researchers studied ways in which nightingales, marmoset monkeys and cuttlefish communicate.
The challenge is a collaboration between the Jeremy Coller Foundation and Tel Aviv University. Submissions for next year open up in August.
Technologies
See Ya, Siri: Why Apple Might Make Third-Party Voice Assistants Available in Europe
When given the choice, iPhone owners might opt for alternatives given the delayed rollout of Siri’s AI revamp.

Apple is reportedly working on changes to the iPhone’s operating system that will make it possible to choose an alternative voice assistant to Siri.
The ability to switch from Siri to another voice assistant, potentially powered by third-party companies including OpenAI, Google or Meta, could be a reality in the near future, but only for iPhone owners in Europe, Bloomberg reports. Apple didn’t respond to a request for comment.
Apple is preparing the changes to Siri in anticipation of the European Union demanding the company allow European users a choice of voice assistants, according to Bloomberg. It would be similar to the policy shift Apple has already made in allowing rival app stores onto the iPhone, which was sparked by Europe’s Digital Markets Act.
Apple has faced many regulatory hurdles with the EU in recent years, largely in the form of challenges to its proprietary technology and walled-garden ecosystem, which provide Apple device owners with high levels of consistency, privacy and security, but often make it difficult for smaller companies to compete.
These regulatory challenges often leave Apple with little choice but to make significant changes to the way its tech works. Some of these changes — such as switching from Lightning connectors to the universal standard of USB-C — affect Apple device owners globally. Others affect only those who live within the EU.
Siri’s AI troubles
Siri has been available on iPhones since 2011 and has spawned many copycats. But the advent of generative AI over the last few years has brought about a number of chatbots, most notably OpenAI’s ChatGPT, that rival and surpass Siri’s capabilities, to the point where Apple is now seen as lagging behind competitors.
Apple announced an AI revamp of Siri last year at WWDC, its June developer conference, but the company delayed its rollout. Apple Intelligence-powered Siri is still nowhere to be seen, and may not even make an appearance at this year’s WWDC, per Bloomberg.
In light of this, it may be possible that European iPhone owners, when given the option, choose an alternative voice assistant. Unless Apple’s hand is forced, there’s currently no indication that people elsewhere will be given the same choice.
But Thomas Husson, VP and principal analyst at Forrester, doesn’t believe the AI overhaul of Siri is Apple’s main challenge.
«Is Siri’s revamp well overdue? Yes. Does Apple give the impression that they have an AI issue? Yes. It is too late for them? I don’t think so,» he said. Instead, Husson said what’s really at stake for the company is its ability to invent a user interface adapted to the AI era and create an ecosystem with companies and developers that will allow for new experiences within existing apps.
«Meeting the EU regulations and especially the DMA makes things more complex,» he added, but that’s the case for any digital platform operating in Europe.
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