Lego Typewriter Writes Plastic Letters

Some time ago, Lego released a beautiful (and somewhat pricey) typewriter set that was modeled after one used by company founder Ole Kirk Kristiansen. To the disappointment of some, it doesn’t actually work—you can’t really write a letter with it. [Koenkun Bricks] decided to rectify this with their own functional design.

Right away, we’ll state that this is not a traditional typewriter. There are no off-the-shelf Lego components with embossed letters on them, so it wasn’t possible to make Lego type bars that could leave an impression on paper with the use of an inked ribbon. Instead, [Koenkun Bricks] decided to build a design that was Lego all the way down, right to the letters themselves. The complicated keyboard-actuated mechanism picks out flat letter tiles and punches them on to a flat Lego plate, creating a plastic document instead of a paper one.

It’s not perfect in operation. It has some issues unique to its mode of operation. Namely, the round letter tiles sometimes rotate the wrong way as they’re feeding through the typewriter’s mechanisms, so you get sideways letters on your finished document. It looks kind of cool, though. Outside of that, sometimes the letter pusher doesn’t quite seat the letter tiles fully on the document plate.

Overall, though, it’s a highly functional and impressive build. We’ve seen some other great DIY typewriters before, too, like this 3D printed build. Video after the break.

Continue reading “Lego Typewriter Writes Plastic Letters”

Making The Fastest LEGO Technic Air-Powered Engine

Just because LEGO Technic is technically a toy doesn’t mean that you cannot do solid engineering with it, like building air-powered engines. After first building a simple air-powered piston engine, this time around [Jamie’s Brick Jams] sought to not only optimize the engine, but also build a clutch and something to power with said engine.

The four-piston design in radial configuration. (Credit: Jamie's Brick Jams, YouTube)
The four-piston design in radial configuration.

The piston head is one of the handful of 3D printed parts, with the new design featuring twin rubber o-rings as a seal instead of a single big one as in the old design. This incidentally matches the multiple seal rings on an internal combustion engine’s pistons, probably for similar blow-by related reasons. The air hose diameter was also increased from 2 to 3 mm to give the engine a larger volume of air to work with, which along with a new flywheel gave a lot more torque. Next the piston rod length was optimized.

The final radial 4-piston engine turns out to work pretty well, with the clutch engaging smoothly. This was used to drive a DIY generator that turned out to produce about 3 Watt of usable power in its final configuration at 6 V, though it’s admittedly a rather crude generator that could be further optimized. When trying a twin-piston configuration with the highest air pressure before air hoses began to pop off, it hit a dizzying 14,600 RPM.

These aren’t half bad results for some LEGO Technic together with some 3D printed bits, rubber o-rings and some lube.

Continue reading “Making The Fastest LEGO Technic Air-Powered Engine”

A photo of the LEGO sorter

Making A Machine To Sort One Million Pounds Of LEGO

You know what’s not fun? Sorting LEGO. You know what is fun? Making a machine to sort LEGO! That’s what [LegoSpencer] did, and you can watch the machine do its thing in the video below.

[Spencer] runs us through the process: first, quit your day job so you can get a job playing with LEGO; then research what previous work has been done in this area (plenty, it turns out); and then commit to making your own version both reproducible and extensible.

A sorting machine needs three main features: a feeder to dispense one piece at a time, a classifier to decide the type of piece, and a distributor to route the piece to a bin. Of course, the devil is in the details.

Continue reading “Making A Machine To Sort One Million Pounds Of LEGO”

Building A Drivable, Life-Size 3D-Printed LEGO Technic Buggy

The 8845 LEGO Technic Dune Buggy original. (Credit: Matt Denton)
The 8845 LEGO Technic Dune Buggy original. (Credit: Matt Denton)

It’s part of the great circle of life that toys and scale models that provide a reflection of macro-sized objects like vehicles and buildings will eventually be scaled up again to life-sized proportions. Case in point the LEGO Technic dune buggy that [Matt Denton] recently printed at effectively human scale, while also making it actually drivable.

The basis for this project is the 8845 Dune Buggy which was released in 1981. Unlike the modern 42101 version, it’s more straightforward and also seems more amenable to actually sitting in despite featuring more pieces for a total of 174 pieces.  Naturally, [Matt] didn’t simply go for a naïve build of the 8845 buggy, but made a few changes. First is the scale that’s 10.42 times larger than the LEGO original, based around the use of 50 mm bearings. The model was also modified to be a single-seater, with the steering wheel placed in the center.

With some structural and ergonomic tweaks in place, the resulting CAD model was printed out mostly in PLA with a 1 mm nozzle and 10% infill using a belt FDM printer to help with the sheer size of the parts. After that it was mostly a LEGO kit assembly on a ludicrous scale that resembles a cross between building a LEGO kit and assembling Ikea flatpack furniture.

At merely the cost of most of his sanity, [Matt] finally got the whole kit together, still leaving a few suspension issues to resolve, as it turns out that so much plastic actually weighs a lot, at 102 kg. With that and other issues resolved, the final touch was to add an electric motor to the whole kit using a belt-driven system on the rear axle and bringing every LEGO minifig’s dreams to life.

After a few test drives, some issues did pop up, including durability concerns and not a lot of performance, but overall it performs much better than you’d expect from a kid’s toy.

Continue reading “Building A Drivable, Life-Size 3D-Printed LEGO Technic Buggy”

ABCCAD Is Voxels Meets LEGO In AR

We get it, CAD software can be daunting to learn. Somehow [Boaztheostrich] found it so daunting he procrastinated his way into a AR voxel-based CAD app he calls “ABCCAD”, written in Godot for the Meta Quest 3.

The app is simplicity itself: pressing A or X on the controller spawns a cube, which you can place wherever you like in virtual space by moving the controller in real space. The trigger then saves the cube position. Grabbing a cube uses the controller’s grab buttons. You can even change colors (with B or Y), but like in OpenSCAD it appears that’s not actually going to have any effect on the exported STL. Check it out in action in the demo video embedded below.

As far as CAD applications go, this is as simplistic as it gets, but there’s a certain charm to its simplicity. It’s almost like virtual LEGO. Besides, TinkerCAD wasn’t much more complicated when it started out, and look at it now.

Sure, one could say if [Boaz] wanted to do CAD he’d have been better off putting the time into learning good old OpenSCAD or FreeCAD (which can now get you SolidWorks certs, apparently), but this is a fun little app that let him stretch his chops in Godot, another great open-source tool. ABCCAD is, itself, open-source under an MIT license.

We seem to have a paucity of posts under the Godot tag, so if you’ve got a hack that uses the open-source game engine, please send us a tip.

Continue reading “ABCCAD Is Voxels Meets LEGO In AR”

Making Steam-Powered LEGO Machines

Over the decades we have seen a lot of methods for powering LEGO-based contraptions, ranging from LEGO Technic pneumatics to electric motors, but what about steam power? We have all seen those cute little model steam engines that can definitely put out some power. Sure, you can just drop those in like a kind of confused internal combustion engine, or you can try to make a steam engine that actually tries to be directly compatible with LEGO.

While exploring this topic, [Jamie’s Brick Jams] on YouTube found that the primary concern here is simply the very hot steam produced by the boiler. While not a surprise to anyone who has ever run a model steam engine, this poses a major challenge to the thermoplastics used by LEGO.

Obviously a boiler cannot be made out of plastic, but the steam turbine can. That said, material selection here is key, as the hot, wet steam produced by the boiler demolishes PLA parts and ruined the original and very unsafe copper boiler in the process. Ultimately a LEGO Technic-compatible steam turbine was printed in high temperature resistant PAHT-CF and PC filament, which enables a steam-powered LEGO walker to come to life, albeit with a distinct lack of power.

Model steam engine enthusiasts are of course quick to point out that you should try to create dry steam through superheating, definitely add a safety valve and so on, all of which should make for an even more powerful and safe LEGO steam engine. For a rundown of how steam engines work, [Lawrie] did an excellent video on the basics a while back, as well as a video playlist full of demonstrations of both classical Mamod model engines and questionable modern takes.

Suffice it to say that although model steam engines look like toys, they involve fire, hot steam and other fascinating ways to melt things, light them on fire and cause painful injuries, so definitely follow a safety briefing before attempting any of it at home.

Continue reading “Making Steam-Powered LEGO Machines”

Just a simple Lego bouncy DVD logo screensaver mechanism. (Credit: Grant Davis, YouTube)

Building The DVD Logo Screensaver With LEGO

The completed Lego DVD screensaver. (Credit: Grant Davis, YouTube)
The completed Lego DVD screensaver. (Credit: Grant Davis, YouTube)

There’s something extremely calming and pleasing about watching a screensaver that merely bounces some kind of image around, with the DVD logo screensaver of a DVD player being a good example. The logical conclusion is thus that it would be great to replicate this screensaver in Lego, because it’d be fun and easy. That’s where [Grant Davis]’s life got flipped upside-down, as this turned out to be anything but an easy task in his chosen medium.

Things got off on a rocky start with figuring out how to make the logo bounce against the side of the ‘screen’, instead of having it merely approach before backing off. The right approach here seemed to be Lego treads as used on e.g. excavators, which give the motion that nice pause before ‘bouncing’ back in the other direction.

With that seemingly solved, most of the effort went into assembling a functional yet sturdy frame, all driven by a single Lego Technic electromotor. Along the way there were many cases of rapid self-disassembly, ultimately leading to a complete redesign using worm gears, thus requiring running the gears both ways with help from a gearbox.

Since the screensaver is supposed to run unattended, many end-stop and toggle mechanisms were tried and discarded before settling on the design that would be used for the full-sized build. Naturally, scaling up always goes smoothly, so everything got redesigned and beefed up once again, with more motors added and multiple gearbox design changes attempted after some unfortunate shredded gears.

Ultimately [Grant] got what he set out to do: the DVD logo bouncing around on a Lego ‘TV’ in a very realistic fashion, set to the noise of Lego Technic gears and motors whirring away in the background.

Thanks to [Carl Foxmarten] for the tip.

Continue reading “Building The DVD Logo Screensaver With LEGO”