2026-03-17 07:00:13
Recycling plastic at home using 3D printed molds is relatively accessible these days, but if you do not wish to invest a lot of money into specialized equipment, what’s the most minimal setup that you can get away with? In a recent [future things] video DIY plastic recycling is explored using only equipment that the average home is likely to have around.
Lest anyone complain, you should always wear PPE such as gloves and a suitable respirator whenever you’re dealing with hot plastic in this manner, just to avoid a trip to the emergency room. Once taken care of that issue, there are a few ways of doing molding, with compression molding being one of the most straightforward types.
With compression molding you got two halves of a mold, of which one compresses the material inside the other half. This means that you do not require any complex devices like with injection molding, just a toaster oven or equivalent to melt the plastic, which is LDPE in this example. The scrap plastic is placed in a silicone cup before it’s heated so that it doesn’t stick to the container.
The wad of goopy plastic is then put inside the bottom part of the mold before the top part is put in place and squeezed by hand until molten plastic comes out of the overflow opening(s). After letting it fully cool down, the mold is opened and the part released. Although the demonstrated process can be improved upon, it seems to work well enough if you are aware of the limitations. In terms of costs and parts required it’s definitely hard to come up with a cheaper way to do plastic molding.
2026-03-17 04:00:16
Every ham radio shack needs a clock; ideally one with operator-friendly features like multiple time zones and more. [cburns42] found that most solutions relied too much on an internet connection for his liking, so in true hacker fashion he decided to make his own: the operator-oriented Ham Clock CYD.
The Ham Clock CYD is so named for being based on the Cheap Yellow Display (CYD), an economical ESP32-based color touchscreen LCD which provides most of the core functionality. The only extra hardware is a BME280 temperature and humidity sensor, and a battery-backed DS3231 RTC module, ensuring that accurate time is kept even when the device is otherwise powered off.
It displays a load of useful operator-oriented data on the touchscreen LCD, and even has a web-based configuration page for ease of use. While the Ham Clock is a standalone device that does not depend on internet access in order to function, it does have the ability to make the most of it if available. When it has internet access over the built-in WiFi, the display incorporates specialized amateur radio data including N0NBH solar forecasts and calculated VHF/HF band conditions alongside standard meteorological data.
The CYD, sensor, and RTC are very affordable pieces of hardware which makes this clock an extremely economical build. Check out the GitHub repository for everything you’ll need to make your own, and maybe even put your own spin on it with a custom enclosure. On the other hand, if you prefer your radio-themed clocks more on the minimalist side, this Morse code clock might be right up your alley.
2026-03-17 02:30:05
Kitchen scales are plentiful and cheap, but their accuracy and measuring speed often leave a lot to be desired. In particular the filtering out of noise can make small changes a nightmare as e.g. adding a little bit of weight slowly can result in the result never updating. This frustrated [Mark Furneaux] enough that he dug up the load cell and metal base of a scrapped laboratory scale and added a strain gauge amplifier to build a better kitchen scale around it.
The only purpose-bought part was an HX710-based strain gauge amplifier module for $7 with LED display, with the metal base getting some metal bits welded onto it to hold said module as well as a push button and toggle switch. Existing wiring from the load cell was wired into the HX710 module, with power provided from a single 18650 Li-ion cell. This was paired with the standard TP4056-based module and its protection IC.
Ultimately the entire assembly looks very much bodged together, with plentiful zip ties, hot glue and messy welding, but it’s hard to deny that it seems to work well. A plastic cutting board makes for a good surface for the items being weighed, and measured drift across the range was about 200 mg, while the amplifier module updates the output in real-time so that you can see even the smallest changes and noise.
Even if you’re not lucky enough to have such a nice load cell and base kicking around, strain gauges are everywhere, and you can absolutely hack an existing (kitchen) scale to be better with some custom hard- and software.
2026-03-17 01:00:15
Lego train sets have been available for decades, now. The Danish manufacturer long ago realized the magic of combining its building block sets with motors and plastic rails to create real working railways for children and adults to enjoy. Over the years, Lego has innovated through several generations of trains, from classic metal-rail systems to the more modern IR and later Bluetooth-controlled versions. The only thing largely missing over all that time, though…? A bridge!
Yes, Lego has largely neglected to build any bridges for its mainstream train lineup. There are aftermarket solutions, and innovative hacks invented by the community, all with their own limitations and drawbacks. This glaring oversight, though, seemed like a perfect opportunity to me. It was time to fire up the 3D printer and churn out a fully-realized Lego rail bridge of my very own.
There’s actually a good reason Lego bridges aren’t a big thing in the company’s own product lineup, beyond a few obscure historical parts. This is probably because they aren’t very practical. Lego locomotives are not particularly strong haulers, nor do they have excellent grip on the rails, and this makes them very poor at climbing even mild grades. Any official Lego bridge would have to be very long with a shallow slope just to allow a train to climb high enough to clear a locomotive on a track below. This would end up being an expensive set that would probably prove unpopular with the casual Lego train builder, even if the diehard enthusiasts loved it.
There are third-party options available out there. However, most rely on standard Lego track pieces and merely combine them with supports that hold them up at height. This can work in some cases, but it can be very difficult to do cool things like passing a Lego train under a bridge, for example. It can be hard to gain enough height, and the short length of Lego track pieces makes it hard to squeeze a locomotive between supports.
However, none of these problems are insurmountable if you’re dedicated to the task. The trick is in being able to make entire pieces of Lego track with custom geometry to suit your exact needs. I’ve always tried to add bridges to my Lego railways, and I’ve found that trying to do so with the standard track pieces is often difficult. At just 150 mm long, they require a lot of supports, particularly at the joints, and it can be difficult to build any sort of structure that is stable enough to hold together without a train derailing across it. After many prior experiments, I figured that 3D printing bespoke bridge pieces would probably be the way to go to build a stable Lego train bridge that actually works.
I started my work by recreating the track geometry so that my 3D printed parts would work with official Lego track. I was able to recreate the rails and the inter-track coupler design, based on a drawing available at the L-Gauge website. From there, I began my bridge design, starting with picking the most critical number—the grade of the bridge. Having done some research on Lego trains online, combined with my own prior tests, I figured a 10 degree grade would be low enough for a Lego train to climb without too much trouble. I also wanted to make the individual bridge pieces as long as possible to reduce the number of joints involved. I landed on a figure of approximately 290 mm, as this was the largest track length I could fit by printing diagonally on my printer.
I quickly worked up a design that involved seven separate pieces to create a whole bridge. Three individual ramp pieces on each side, plus a central flat bridge piece that has a piece of track passing at a perpendicular angle underneath. In total, the whole bridge measures almost two meters long, mostly because Lego locomotives only like a gentle climb and it’s quite a hike to get high enough to clear a train passing below.
From the get go, I wanted to print without supports—both for speed and to save plastic. This took some experimentation, but I mostly achieved success by using arches and subtle curves to keep overhangs in check and create a structure that would print cleanly.
With that said, one might argue that the excessive amount of arches and pillars used in my design might have wasted more plastic than just using standard supports generated by the slicer. Regardless, I think the choice to go with arches gave the bridge a nice aesthetic befitting a good railway. I printed the bridge pieces in PLA at a layer height of 0.20 mm, using two-colored filament just because I could, and it was cheap at the store. While some of the diagonal stretches of the rails featured obvious layer lines, this didn’t seem to have any negative effect on performance. It did, however, give the trains a zippy sound when they climbed and descended the bridge.
I set about testing the bridge design by inviting some friends over and building a railway in my living room. We set up a simple S-shaped loop that would allow a single train to test both the bridge itself and the passthrough track underneath. Early testing revealed some fun unexpected problems. Right off the bat, we found that one Lego locomotive had a low-slung piece that would smash into the track coupler as it came down off the bridge back on to the flat rails at ground level. Removing that piece barely compromised the look of the locomotive but enabled it to pass the bridge more easily.
We also soon found issues with carriages. Even at a subtle 10-degree grade, most Lego locomotives struggled to pull more than a single carriage up the slope. Further compounding the problem was that the momentum from the extra carriages on the downhill tended to overspeed the train and derail it at an immediately-following turn. Some carriages and locomotives were also simply incompatible with the bridge due to my design decisions. I had not paid much attention to the transitions on and off the sloped ramps. This meant that some longer carriages with wider-spread bogies would find themselves derailing as one set of wheels left the track while passing over the bridge. There were also some minor issues with the bridge pieces themselves and how they couple together. The Lego track coupling design is pretty good at snapping pieces together when they’re injection molded. It doesn’t work as well with softer 3D-printed PLA, nor is it good at locking together big heavy pieces of bridge that weigh many hundreds of grams each.
Nevertheless, the bridge design did mostly work if you were careful and only ran the right trains. With a layout built to suit the vagaries of over-bridge travel, with lots of straights for run-up and run-off, it was possible to climb and descend without too much trouble. The underpass track was also perfectly serviceable and presented precisely no problems during hours of play.
This bridge design could be easily improved. I’d probably rework the design with a lower grade—maybe 7 degrees, maybe 5—and really smooth out the transitions on and off the slope to allow as many different Lego trains to use the bridge as possible. Beyond that, it would simply be a matter of improving printability and reducing plastic use to really make this project shine. For those eager to try printing what I built, the files are available, but just be wary that your mileage, and your train’s mileage, may vary.
The fun thing about 3D printers is that they are perfect for jobs like this. If you need to make a plastic part with specific geometry, it’s now almost trivial to do. That makes recreating or innovating on things like toys or home appliances really easy, and also very fun. I had a blast designing this bridge and putting it together, and even more fun playing trains with my friends. I’d highly recommend taking a shot yourself if you feel like tinkering with Lego railways at home!
2026-03-16 23:30:18
Tic-Tac-Toe is a relatively simple game, and one of the few which has effectively been solved for perfect play. The nature of the game made it possible for [Joost van Velzen] to create a LEGO machine that can play the game properly in an entirely mechanical fashion.
The build features no electronics to speak of. Instead, it uses 52 mechanical logic gates and 204 bits of mechanical memory to understand and process the game state and respond with appropriate moves in turn. There are some limitations to the build, however—the game state always begins with the machine taking the center square. Furthermore, the initial move must always be played on one of two squares—given the nature of the game though, this doesn’t really make a difference.
It’s also worth heading over to the Flickr page for the project just to appreciate the aesthetics of the build. It’s styled in the fashion of an 18th-century automaton or similar. It’s also been shared on LEGO Ideas where it’s raised quite a profile.
If you’ve ever wanted to think about computing in a mechanical sense, this build is a great example of how it can be done. We often see some fun LEGO machines around these parts, from massive parts sorters to somewhat-functional typewriters.
2026-03-16 22:00:33
They say you should never throw out old clothes because they will come back in style one day. Maybe they are right. We noted in a recent BBC post that, apparently, wired headphones are making a comeback. Like many people, we were dismayed when Apple took the headphone jack out of the iPhone and, as [Thomas Germain] notes, even Google eventually ejected the normal headphone jack. (Although, in fairness, most of the Pixel phones we’ve seen come with a pair of USB-C earbuds.)
On the face of it, though, wireless seems to be a good idea. You can get cheap Bluetooth earbuds now, although maybe still not as cheap as wired buds. Sure, they sound terrible, but so do cheap buds. It is a pain to charge them, of course, but not having to untangle wires is a benefit. On the other hand, you never have to charge your wired headphones.
So why are people suddenly going back to wires? According to the BBC and analytics firm Circana, the second half of 2025 saw an explosion in wired headphone sales, and sales continued to rise in 2026.
The biggest reason cited was sound quality. While Bluetooth has made huge strides in sound quality, you are still trading something for wireless. We have to admit, we get annoyed when the Bluetooth drops out, but we wonder how many people can really hear much difference in audio quality? If you care about latency, maybe that’s a point in the wired gear’s favor. But if your song starts 250 milliseconds late, you probably don’t care. It is only an issue when you have video or games.
Many people, when using a modern Bluetooth stack, can’t tell the difference in audio quality between wired and wireless, especially with normal source material and in typical listening environments.
According to [SoundGuys], while Bluetooth is technically worse, if you are over 24 or not in a perfectly quiet environment, you probably can’t tell the difference. Another study found that casual listeners could only guess which headphones were wireless 50% of the time. Even two pro audio people got it wrong 30% of the time.
The problem historically with Bluetooth is that it creates a digital stream to the headphones, which is compressed and decompressed using a codec. The original codec was SBC (Subband Codec), and it didn’t sound that great.
However, as technology gets better, so do the codecs. AAC, LDAC, and others sound great. LDAC, for example, transmits audio at roughly 990 kbps and with very little distortion.
So when you are looking at Bluetooth sound, you have to account for several things. If your source or destination doesn’t support modern codecs, it might not sound as good as it could. In addition, you are dealing with the headphone’s internal digital-to-analog converter. If you think your $10 earbuds have a converter that matches the audio output from your phone or motherboard, you will probably be disappointed. But that’s not a fault inherent with Bluetooth. Cheap sound devices sound worse than expensive ones, in general.
There are other reasons to go wired. Apparently, some social media influencers have decided that the right pair of wires dangling from your ears is a fashion accessory. Maybe some of it is like the resurgence of vinyl records or typewriters: nostalgia. Or, perhaps it is just a fad. As a practical matter, it does help people see that you are just sitting at your desk swaying for no reason.
Apparently, even the brand and design of headphones are important to fashionistas. For example, the three-year-old video below shows how old Koss headphones with some color changes went viral. (Although of course you can also get a Bluetooth variant.)
While this might not make sense to a Hackaday crowd, headphones have long been a fashion accessory, and headphones like Beats were, at least at one point, the must-have accessory for some people.
Of course, if you really want to make a statement, you can check whether any of the 10 $135,000 headphones are in stock. Or, try a $750,000 pair of Beats, which probably don’t sound as good as you would hope for that price.
There are people who swear they need gold-plated cables or ones with no oxygen or whatever to get the perfect sound. Tests involving sending audio through a banana don’t back that up.
So, sure, you need to invest in good-quality gear. You really need to make sure the whole setup supports something like aptX, LDAC, or even AAC. You also need a good source. Old movies don’t look better on an 8K TV; after all, why should your headphones improve your 1979 mix tape digitized at 32k?
Unless you are worried about latency or you experience dropouts for some reason, there is very little difference for most people. Of course, if you want to use a wired headphone on a modern phone, you probably need an adapter or USB headphones, which basically have the adapter built in. And your audio will only be as good as that adapter, too, so choose wisely. Don’t forget to pick the right cables, too.
If you are experiencing dropouts, you may need better equipment. Or maybe just take your phone out of your pocket with the keys and the RFID-blocking wallet. Bluetooth can, in theory, travel 30 ft, but reality is something else, and interference from other devices can also be a problem, especially if you have a dual WiFi/Bluetooth device in your computer. We’ve heard, too, that unpairing and repairing can sometimes help, although you wouldn’t think it should matter.
One thing we do suggest. As long as wired headphones are a fad, it is probably a great time to list your old wired gear on eBay, Facebook Marketplace, or a similar site. Fads drive prices up, and the old cans may never be worth so much again.
So what do you think? Can you really tell the difference? What’s your daily driver? Let us know in the comments.
