Reliable recipe for DIY ferrofluid

Braniac75, after trying and failing to replicate the various online recipes for DIY ferrofluid (the consumer stuff is $200+ a liter), figured it out: 1 part iron oxide powder, 1 part "clinging" synthetic motor oil, a stirring stick, and a dangerously powerful magnet to risk your fingers with: "it really is that easy."

The result is more of a paste than a liquid, but it works!

Wanna try ferrofluid yourself but don't want to pay the premium price? In this video I show you how to make your own very easily and cheaply! I couldn't get the common DIY recipes found online to work well but in desperation found another way through my own experiments. I call it ferripaste since it isn't as fluid as the commercial stuff - but that only makes it even more interesting to play with. It will behave in a more varying ways to a magnet than just spikes like the ferrofluid. Hope you can use it to make you own amazing ferripaste experiments :)
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Numb chucks: weapon made from number keys

KB at the 40% Keyboards blog created nunchaku from two keyboard number rows and a dual-headed USB cord.
Connected two FML macropads with a micro USB OTG cable. While the fiberglass construction of the FML would be quite sturdy, the USB connectors on the Pro Micro's will probably break off the first time you hit something with it.

Here's an article about the number rows, themselves a custom creation. Read the rest

How to make this lovely color-shifting crystal lamp

Hitting the base of a large piece of inexpensive crystal with some LED lights gives a remarkable and lovely effect in this howto video by DIYPerks. Read the rest

How to make a cool Iron Throne phone charger

Martina at Natural Nerd takes Game of Thrones fans through instructions on making a badass-looking Iron Throne phone charger. Read the rest

Watch this guy make a cool pot from an old fence post

Australian woodworker Brendan Stemp found an old fence post with decades of weather damage. After some prep work, he filled the wood gaps with resin and turned a beautiful pot on his lathe. Read the rest

How to make a Harry Potter Golden Egg

YouTuber TheCraftMaiden decided to make a Harry Potter Golden Egg, and it's a triumph of winging it when trying a craft project. It even has a turnable owl to open it. Read the rest

How to make your own fidget spinner from paper

This cool paper fidget spinner is basically an origami pinwheel, but it's still pretty neat. Read the rest

Guy builds 320,000 gallon pool in his backyard

Jerry and Marina Leussink of Sundre, Alberta didn't have a farm pond, so they build a custom pool-like pond lined with inch-thick plastic. Read the rest

Lampshade made of repurposed prescription bottles

Emily Seilhamer specializes in upcycling everyday things. Here's a ton of amber prescription bottles repurposed as a cool lampshade. It also doubles as the world's worth windchime. Read the rest

Look at this spaceship bunk bed a dad made for his kid

It took Pete Dearing 100 hours to build this rocket ship bunk bed from blueprints he purchased online. His kids love it.

From Sarah Vitak's story in Make:

Most of the buttons control real lights, sounds, fans, meters, and headlights. All the sounds are controlled via Raspberry Pi. Plus, Dearing wired in a couple sets of headphones with mics, so that the kids can communicate with each other just like real space explorers!

Even though it’s a rocket ship, the bunk bed has transformed into everything from a bus to a submarine during playtime. When asked if he gets to help pilot the ship, Dearing says, “Of course! I can’t fit into the cockpit easily, but I still get to wear headphones and join in.”

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An electric fence to keep snails out of your vegetable garden

Here's a vegetable gardener who didn't want to share his bounty with slugs and snails, so he strung an electric barrier around the perimeter of his raised bed garden. Anytime a voracious mollusk attempts to enter the garden, it must first crawl over a pair of electrified wires, where it receives a mild shock sufficient to thwart its plans.

The gardener has kindly posted instructions for others interested in making a 9 volt electric snail/slug fence. Read the rest

You can build this world’s tiniest Game Boy Color clone

A fellow who goes by the name [c.invent] designed and built this open-source keychain-sized multi-platform emulation console, called the Keymu. It uses an Intel Edison (a computer-on-module). a 1.5-inch OLED display, and 11.7mm speaker, and a 220 mAh lithium battery, all inside a 3D printed clamshell case. You can learn how to make your own at Hackaday.

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A tiny Hayes modem for your tiny retro computer

The WiFi232 is a traditional old-timey old-schooley Hayes-compatible 300-115200 baud modem, no wider than its own parallel DB25 port.

Automatically responds with a customizable busy message when already in a call.

The killer app seems to be using it to get internet onto ancient retro portables like the TRS-80 Model 102, but it's been put through its paces on various 16-bit Commodores, Ataris and Apples too. Here's Blake Patterson:

The purpose of the device is to act as a bridge between your serial port and your local WiFi router. It has a 25-pin RS-232 data interface and a Mini-USB connector for power — it should work with any computer sporting a standard serial port.

The WiFi232 is configured by connecting to the device’s built-in web server and loading the configuration page or by issuing extended AT configuration commands. For example,


points the device to your WiFi hotspot. Once things are configured (it supports 300 to 115,200 baud), just load up your favorite terminal program, type:


and the WiFi232 “dials” into that telnet BBS. Your vintage computer thinks its talking on the phone.

It's $33 as a pile o' parts or $49 assembled, but there's a waiting list. Read the rest

$70 Hackintosh matches MacBook Pro

Snazzy Labs built a startlingly powerful Mac with only $70—editing the video above on it to prove it!

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Twist off your zip ties, don't cut them

If you cut a zip-tie tail with scissors, it leaves a sharp-edged stub. In this video, you'll learn how to use pliers to twist of the tail, which creates a stub without a sharp tail.

I just tried it (above photo) and it works. On the left is twist method. On the right is the scissors method (cutting as flush to the catch as possible). The tail on the twisted zip tie feels like a smooth, melted lump of plastic. Very cool!

[via Make's Tips of the Week] Read the rest

Dangerous makeshift swimming pool on apartment balcony is a recipe for disaster

Reddit folks have estimated that there's about 5,000 pounds of water in this makeshift wading pool. Will the balcony support it for long?

Will the balcony resist the weight? from WTF
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Look how fast these tiny Japanese sumo robots move

These little remote control vehicles are designed to push each other out of a small circle. They dart so fast that it's hard to keep up.

[via] Read the rest

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