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With this coffee cold brewer, you can make the perfect cup of iced coffee in style. Using 3D printed fittings, some off-the-shelf laboratory glassware, and maple dowels, this piece turns the cold brew process into a performance.

There are a many methods of making iced coffee, here are a few I'm familiar with:

Japanese Iced Method: Coffee is brewed hot (pour-over, Aeropress, etc.), then dripped directly over ice, cooling it instantly. This basically tastes the same as hot coffee- same acidity, similar flavor profile and aromatics.

Crash Cooling: An easy way to do this one is to brew a cup of coffee, pour it in a steel cocktail shaker, then put the shaker in a bucket of ice until the temperature drops. This will take the coffee down to temperature without diluting it in melting ice, the way the Japanese Iced method will.

Nitro (pressurized): "treated with nitrogen and/or carbon dioxide under high pressure, then chilled in a keg and served on draught with a foamy head like a Guinness." - Bon Apetit

I love the taste of this kind of coffee. It really is like a coffee Guinness. Alas, I don't have the space for a setup like this, so I resort to the next best thing...

Cold Brewing: With this method, a small amount of coffee grounds are steeped in cold water, and drip the resulting brew at about one drop / 3 seconds. My impression is that boiling water releases caffeine and acidity much faster than cold water does. Steeping the grounds in cold water and releasing it slowly cuts the acidity significantly (you can taste that), but I've heard heard the argument that since it's steeping for so long (2-6 hours), the caffeine content is about the same as it would be in a hot brewed cup.

In any case, this method makes incredibly smooth, nutty, floral coffee without the acidic bite. I love the bitterness of hot coffee, but for some reason it's not as pleasant to me when it's cold.

Step 1: Design

This design went through a few iterations. At first, I was thinking of it as something that would hang on a wall, but I decided to go with a tripod design using dowels because I thought it would be more versatile- no need to dedicate wall space to it.

In the first design, there were 3D printed clips that would grab the necks of the flasks, but this came across less elegant to me than a simple hook with a recessed ledge. The hooks holt the flasks just fine, and would work if they were made out of ceramic, which I might explore later.

The STL files in this step are ready to prep for 3D printing (they'll need support structures on an FDM print), and the .f3d file is the final design file available for tweaking for personal use.

<p>I have experimented using a large tea diffuser type jug. I place the required coffee grounds into the diffuser, add a quantity if ice cubes and tap water. </p><p>Let it sit overnight in the fridge (or on the bench, if the nights are cool). </p><p>Remove the coffee grounds and serve as you desire.</p><p>This works well and is simple.</p>
<p>Yeah, I think they call that the toddy method. It tastes completely different than the cold drip method even with the same beans. There are so many ways to make coffee.</p>
<p>I'll stick with my half gallon mason jar sitting on my counter. This is an adorable outfit but it seems to take a really simple project and turn into something ...... just a bit over-engineered.</p>
<p>That's kind of the point. I'm turning something mundane into an exhibition...</p>
<p>What an awesome product! I love the look of artistic cold coffee brewers. Would you be willing to give a rough estimate of how much this cost to build?</p>
<p>Glad you like it! Not counting tools, if you buy everything new it costs about $40-$50 in materials. </p>
No way, that little?? Amazing! Especially considering the cost of some &quot;high end&quot; cold brewers. May take awhile, but I will definitely be making this at some point!
autolycos, the stopcock isn't integrated, I bored one out using the same process described in the siphon step so it would fit the filter. The coffee and paper filters slow down the drip significantly. It drips about once every five seconds, where at least three seconds is recommended.
<p>I think my mention of the sep funnel was confusing. I mentioned that because the sep funnel does have an integrated stopcock, where the boiling flasks don't. Also, I've never needed to put a siphon in a sep funnel, which also removes a step.</p><p>Those reasons are why I asked about your choice of a boiling flask on top.</p>
<p>Aha! I was hoping someone with some chemistry equipment knowledge would weigh in. Thanks for the tip!</p>
<p>Great idea! I love the look of the two boiling flasks. But, with the price of the needle valve setup, I'm curious about using a separatory funnel with an integrated stopcock. Do those drip too fast?</p>
<p>This is a great idea, perfect for summer. I notice you said it took about four hours to brew, how warm was the environment, was it in direct sun?</p><p>I feel like you could set it up for an overnight drip so you can have awesome chilled coffee for summer mornings (currently in Australia, so Summers get pretty warm)</p>
<p>It wasn't in direct sunlight and it's a pretty steady 72°F indoors at Pier 9. My understanding is that the colder the water steeping the grounds, the smoother the flavor will be. So yeah, if it's warm during the day it's probably best to do it at night.</p>
<p>Hi, great project. What is the design tool you used? Thx</p>
<p>I used Fusion 360 for this and pretty much every project I've done for the past year. It's free if you make less than $100k per year on the stuff you make with it, and it's powerful with a simple interface.</p>
Loving this design have been researching cold brew a lot the last few weeks and from what I've read they recommend the valve to be ptfe as the brass have a habit of seizing which requires grease which doesn't go well with food stuffs great project tho mate ?
There is food grade mineral oil found usually in the pharmacy. It's indigestible and non-toxic and used in large quantities a laxative, so a little goes a long way.
<p>Thanks for the tip! I figured since there's only cold water passing through the valve that seizing should be an issue, but I didn't research it that deeply.</p>
HannibalRex, would you please make a coffee roasting instructable? I would love to know your secrets.
<p>I am SO MAKING this, thanks! Except instead of 3D printing that parts I'll blow the glass myself or throw them out of porcelain (I am a ceramic potter). Excited to try this, I'm a HUGE coffee snob, but have yet to get into cold brewing.</p>
<p>Oh please share that with us if you do. I'd certainly love to see it.</p>
<p>Certainly! I just got my bisque kiln last weekend, and need to run the wiring for it, so I hope to be able to do my first firing withing a week or two. Am excited, I LOVE LOVE LOVE coffee (roast my own), and all things brewing, so definately will be working off this i'ble soon! Thanks for the idea and great i'ble.</p>
<p>Oh cool! I wish I had those skills (and facilities). I designed the 3D printed parts to work with ceramics, I was going to try Shapeways' new ceramic material and see how it came out. This project would be gorgeous in hand-blown glass or fired ceramics. Please post an IMadeIt, I've got to see this!</p>
<p>This would make for a cool absinthe fountain as well. I like the wood-and-plastic design better than the industrial steel rod flask holders, too. Very nice, it's going on my to-do list!</p>
<p>Thanks a lot! I thought it would look better this way too. It's good to know it would work perfectly with some off-the-shelf lab equipment, but I think the wood and plastic is a nice touch.</p>
<p>#coffeenerds</p>
<p>#stayamped #waywaywayup #totallyawake #whoneedsapowerdrillwhenihavehad5icedcoffeesandhaveascrewdriver</p>
<p>Super cool project! I&acute;m looking for cool DIY Coffee brewers project!! Totally making this soon...</p>
<p>Thanks man! Hope I get to see an IMadeIt...</p>

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Bio: I'm a full-time Designer at the Instructables Design Studio (best job ever). My background is in residential architecture, film set design, film animatronics, media ... More »
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