God of Papercraft Builds Working Organ Used for Own Adulation

There’s a wide world to explore when it comes to papercraft, but we reserve special praise for fully functional builds. [Aliaksei Zholner’s] working papercraft organ is a stunning example of what can be achieved with skill and perseverance.

The video is short but covers some finer touches – the folded concertinas of paper acting as springs to return the keys, for example. Air is supplied by a balloon, and the organ has a tone similar to other toy organs of comparable size.

The builder has declined to share templates at this stage, due to the complexity of the model and the fact that apparently even the thickness of the paper used can affect the function. This is not surprising — to get any sort of pipe organ to play in tune requires finesse and careful fine tuning. The build thread sheds some further light on the build (in Russian) if you’re curious to know more.

Perhaps the one thing we find surprising is that we haven’t seen something similar that’s 3D printed. If you’ve done it, smash it through on the tip line! Else, if you’re thirsty for more functional papercraft, you can’t go past the fantastic papercraft strandbeest build we covered back in 2011.

Stop Buying Expensive Circular Saw Blades, Use Paper Instead

[John Heisz] was contemplating the secrets of the universe when an errant thought led him to wonder, could I use a sheet of paper as the blade in my table saw?

He takes a sheet of regular printer paper, draws a circle on it the same diameter as his regular blades, and cuts it out. He then bolts it into place on the spindle, slots in the table saw insert for really really thin kerf blades, and fires it up.

The blade is surprisingly dangerous. One would maybe expect a paper blade to be minimally damaging to a finger at best, but it quickly shows itself to be capable of tearing through paper and cutting through wood at a reasonable clip. Since the paper is minimally conductive, a SawStop couldn’t save someone from a lack of caution.

The blade finally meets its match half way through a half-inch thick piece of wood scrap. Wood and paper dust explode outward as the experiment ends. Video after the break.

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Paper Enigma Machine

It was high-tech encryption for an important period of time in the mid-1940s, so perhaps you can forgive us our obsession with the Enigma machine. But did you know that you can make your very own Enigma just using some cut out paper strips and a tube to wrap them around? Yeah, you probably did. But this one is historically accurate and looks good too!

If you just want to understand how the machine worked, having a bunch of paper rolls in your hands is a very intuitive approach. Alan Turing explained the way it worked with paper models too, so there’s no shame there. With this model, you can either make the simple version with fixed rotor codes, or cut out some extra slip rings and go all out.

What is it with Hackaday and the Enigma machine? Just last month, we covered two separate Enigma builds: one with a beautiful set of buttons and patch cables, and another in convenient wrist-watch format. In fact, one of our first posts was on a paper Enigma machine, but the links are sadly lost to bitrot. We figure it’s cool to repeat ourselves once every eleven years. (And this one’s in color!)

The Hacker’s Notebook: a Mission Log for Every Project

While “writing it down” might seem like common sense, it wasn’t always the case. From the times of Ancient Greece, Plato tells a story of a worried Egyptian King, who, upon witnessing the invention of writing, remarks,

“If men learn this, it will implant forgetfulness in their souls; they will cease to exercise memory because they rely on that which is written, calling things to remembrance no longer from within themselves, but by means of external marks. [1]”

To some, the notebook was a dangerous device, a thief that would rob us of our memories [2]. Fortunately, these days, there’s plenty of evidence from our Psych texts that say we humans are pretty shabby at keeping the facts straight. In fact, each time we recall a memory, we change it! Here lies the beauty of the notebook. Have an idea for a new project? Why not log it somewhere for future reference? With diligence, the notebook can become our own personal hub for spurring on new project ideas.

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Build Your Own Sensor Skin

Scientific research, especially in the area of robotics, often leverages cutting-edge technology. Labs filled with the latest measurement and fabrication gear are unleashed on the really tough problems, like how to simulate the exquisite sensing abilities of human skin. One lab doing work in this area has taken a different approach, though, by building multi-functional sensors arrays from paper.

A group from the King Abdullah University of Science and Technology in Saudi Arabia, led by [Muhammad M. Hussain], has published a fascinating paper that’s a tour de force of getting a lot done with nothing. Common household items, like Post-It notes, kitchen sponges, tissue paper, and tin foil, are used to form the basis of what they call “paper skin”. Fabrication techniques – scissors and tape – are ridiculously simple and accessible to anyone who made it through kindergarten.

They do turn to a Circuit Scribe pen for some of their sensors, but even this nod to high technology is well within their stated goal of making it possible for anyone to fabricate sensors at home. The paper goes into great detail about how the sensors are made, how they interact, and how they are interfaced. It’s worth a read to see what you can accomplish with scraps.

For another low-tech paper-based sensor, check out this capacitive touch sensor keyboard.

Thanks for the tip, [Mattias]

Paper Thin Conductors

Swedish scientists have created something they call power paper by using nanocellulose and a conductive polymer. The paper is highly conductive and has applications in supercapacitor technology and printed electronics.

The paper, technically called NFC-PEDOT paper, combines high conductivity and compatibility with conventional paper handling machines that could lead to less expensive manufacturing. The team used the material to create supercapacitors (up to 2F) as well as FET-like transistors known as OECTs (Organic Electrochemical Transistors).

Admittedly, the supercapacitor prototype didn’t look very practical (as they dunked it in a beaker full of potassium chloride). The black-colored paper is relatively conductive (42,000 S/m at 20 degrees C), at least for a paper. As a point of reference, silicon is about 1,000 S/m and iron conducts at about 10,000,000 S/m.

What can we do with NFC-PEDOT? Time will tell. We couldn’t help but wonder, however, if paper-based 3D printing couldn’t be adapted to use paper as an insulator or dielectric, foil as a conductor, and something like this material to build resistive elements. After all, we’ve seen something similar using foil and paper before.

Combination Lock Made Out of Paper

Most projects we feature are of the metal/wire/wood variety, but there is an entire community devoting to making very interesting and intricate things out of paper. Imgur user [Criand] has been hard at work on his own project made entirely out of paper, a combination lock that can hold a secret message (reddit post).

The motivation for the project was as a present for a significant other, wherein a message is hidden within a cryptex-like device and secured with a combination that is of significance to both of them. This is similar to how a combination bike lock works as well, where a series of tumblers lines up to allow a notched shaft to pass through. The only difference here is that the tiny parts that make up the lock are made out of paper instead of steel.

This project could also be used to gain a greater understanding of lock design and locksport, if you’ve ever been curious as to how this particular type of lock works, although this particular one could easily be defeated by a pair of scissors (but it could easily cover rock). If papercraft is more of your style though, we’ve also seen entire gyroscopes and strandbeests made of paper!