These are test stampings-- the final product looks a lot better.

2025 Component Abuse Challenge: Nail Your Next Decal

One of the hardest parts of a project — assuming it makes it that far — is finishing it up in an aesthetically pleasing manner. As they say, the devil is in the details, wearing Prada. Apparently the devil also has an excellent manicure, because [Tamas Feher] has come up with a way to introduce incredibly detailed decals (down to 0.1 mm) in cheap, repeatable fashion, using a technique borrowed from the local nail salon. 

The end result can look quite a bit better than the test piece above.

For those who aren’t in to nail art (which, statistically speaking, is likely to be most of you) there is a common “stamping” technique for putting details onto human fingernails. Nail polish is first applied to voids on a stencil-like plate, then picked up by a smooth silicone stamper, which is then pressed against the nail, reproducing the image that was on the stencil. If that’s clear as mud, there’s a quick demo video embedded bellow. There’s a common industrial technique that works the same way, which is actually where [Tamas] got the idea. For nail salons and at-home use, there are a huge variety of these stencils commercially available for nail art, but that doesn’t mean you’re likely to find what you want for your project’s front panel.

[Tamas] points out that by using a resin printer to produce the stencil plate, any arbitrary text or symbol can be used. Your logo, labels, whatever. By printing flat to the build plate, you can take advantage of the full resolution of the resin printer — even an older 2 K model would more than suffice here, while higher res like the new 16 K models become the definition of overkill. The prints go quick, as they don’t need any structural thickness: just enough to hold together coming off of the plate, plus enough extra to hold your designs at a 0.15 mm inset. That doesn’t seem very thick, but remember that this only has to hold enough nail polish to be picked up by the stamper.

[Tamas] cautions you have to work fast, as the thin layer of nail polish picked up by the stamper can dry in seconds. You’ll want plenty of nail polish remover (or plain acetone) on hand to clean the stamper once you’ve finished, as well as your stencil. [Tamas] cautions you’ll want to clean it immediately if you ever want to use it again. Good to know.

While this is going outside of the nail art kit’s comfort zone, it might not quite be abuse. It is however a very useful technique to add to our ever-growing quiver of how to make front panels. Besides, we don’t specify you have to literally make components suffer; we just want to see what wild and wonderful substitutions and improvisations you all come up with.

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Announcing The 2025 Hackaday Superconference Communicator Badge

It’s the moment you hard-core hardware nerds have been waiting for: the reveal of the 2025 Hackaday Supercon Communicator Badge. And this year, we’ve outdone ourselves, but that’s thanks to help from stellar collaboration with folks from the community, and help from sponsors. This badge is bigger than the sum of its parts, and we’ve planned for it to be useful for you to hack on in the afterlife. Indeed, as always, you are going to be the final collaborator, so we can’t wait to see what you’ll do with it.

We’re going out – wide out – on a limb and trying to create a dense mesh network of badges talking to each other at Supercon. It’s going to be like a badge-hosted collection of chat rooms, as connected as we can make them without talking over each other.

You look up a topic, say Retro Computing or SAO trading, punch in the channel number on the numpad, and your badge starts listening to everything going on around that topic. But they also listen to everything else, and repeat anything they hear on to their neighbors. Like IRC, but LoRa.

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2025 Hackaday Supercon: Two New Workshops, Costume Party, Lightning Talks, And A New-Space Panel

So much news, so little time left until Supercon! We hope you all have your tickets. If not: Workshop and general admission tickets are on sale now. We’re getting down to the last slightly-more-than-two-handfuls, so if you’re thinking of coming, the time for procrastination has passed.

First up, we have two late-addition workshops, and tickets were just made available. Maybe you noticed that Arduino was bought by Qualcomm, and they kicked off the union with a brand-new board? You can get yourself one, and learn how to use it. And not to be outdone, the CEO of Framework, makers of modular laptop computers, is coming with a grab-bag of parts for you to play with.

Leonardo Cavagnis & Tyler Wojciechowicz

Arduino x DigiKey Presents – From Blink to Think: Discover Arduino Uno Q

Explore the power of Arduino Uno Q, the new board combining a microcontroller and a microprocessor. In this hands-on workshop, you’ll learn how to get started with Uno Q and unlock its dual-core capabilities for intelligent and connected projects.

Nirav Patel
Framework Mystery Boxes: Swap & Build

This workshop is hosted by Framework’s Founder and CEO, Nirav Patel. You’ll receive a box of assorted returned/refurbished Framework Laptop parts at the start of the workshop. You can then trade parts with other attendees and work together to try to build a functioning computer of some kind. You’ll pick up some tips and tricks on debugging and repair along the way.

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Hackaday Links: October 19, 2025

After a quiet week in the news cycle, surveillance concern Flock jumped right back in with both feet, announcing a strategic partnership with Amazon’s Ring to integrate that company’s network of doorbell cameras into one all-seeing digital panopticon. Previously, we’d covered both Flock’s “UAVs as a service” model for combating retail theft from above, as well as the somewhat grassroots effort to fight back at the company’s wide-ranging network of license plate reader cameras. The Ring deal is not quite as “in your face” as drones chasing shoplifters, but it’s perhaps a bit more alarming, as it gives U.S. law enforcement agencies easy access to the Ring Community Request program directly through the Flock software that they (probably) already use.

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2025 Component Abuse Challenge: Conductive Filament Makes A Meltable Fuse

Everything is a fuse if you run enough current through it. Or at least [JohnsonFarms.us] seems to think so, which has led him to design 3D-printed fuses made from conductive PLA filament.

Conductive filament is a meltable resistor, which, if one squints hard enough, is basically a fuse.

In theory a 3D printed fuse works the same as a normal one: excessive current draw will cause the conductive plastic to briefly become a heater, causing it to self-destruct and break the electrical connection. There’s a risk of melted plastic and perhaps a nonzero combustion risk, but [JohnsonFarms.us] is less interested in whether this is a good idea and more interested in whether it can work at all, and with what degree of predictability and/or regret.

His experiments so far show that printed fuses are essentially meltable resistors with values between 300 Ω and 1250 Ω, depending on shape. What it takes to bring those to roughly 60 °C, where PLA softens, and around 150 °C, where PLA melts, is next on the to-do list.

Whatever conclusions are reached, it is interesting to think of conductive filament as a meltable resistor, and ponder what unusual applications that might allow.

Most conductive filaments have high resistance, but not all. Some, like Electrifi by Multi3D, have extremely low resistance and were used in a project that made 3d-printed logic gates.

Decoding A 350 Year Old Coded Message

Usually, a story about hacking a coded message will have some computer element or, at least, a machine like an Enigma. But [Ruth Selman] recently posted a challenge asking if anyone could decrypt an English diplomatic message sent from France in 1670. Turns out, two teams managed it. Well, more accurately, one team of three people managed it, plus another lone cryptographer. If you want to try decoding it yourself, you might want to read [Ruth’s] first post and take a shot at it before reading on further here: there are spoilers below.

No computers or machines were likely used to create the message, although we imagine the codebreakers may have had some mechanized aids. Still, it takes human intuition to pull something like this off. One trick used by the text was the inclusion of letters meant to be thrown out. Because there were an odd number of Qs, and many of them were near the right margin, there was a suspicion that the Qs indicated a throw-away character and an end of line.

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