Ha that's pretty cool you used a compressed air canister. Maybe you can try to make a PID controller for the valve to maintain a steady pressure as your next step!
@@theledman sure and I also appreciate the experiment. But that $330 is shrinking with every cup and will eventually go negative. Plus the external dependency doesn’t tick my prepper box.
@@dmackle3849 The robot is way heavier and pretty big. Compared to a big machine its small, but i coudnt imagine taking it to work.This machine on the other hand... You could also probably reduce ongoing costs bu using bigger co2 cylinders. Woud make it heavy though
As a barista with a 3D printer, your design is simply amazing. The quality of the espresso looks amazing considering the sercomestanses. The creamer and colour of the espresso looks just like from a normal $3000+ machine. Does the CO2 cartridge affect the taste?
Sorry this is an unlisted video so I didn't see this until now. I've added an addendum to the bottom of my original blog post. Tl;dr, no it does not impact taste because CO2 solubility in nearly boiling water is extremely low.
It'd be interesting to compare the flavor of espresso pressurized with CO2 vs N2O (aka whip-its). You should be able to find N2O canisters compatible with your pressure valve.
Remember that water is incompressible. Fill the basket almost full, and weigh output instead of input. It will build pressure quickly and use less co2 per shot this way. You will also have less thermal losses because you have a bigger thermal mass of water.
While this is all true, you would need a pop valve or some easy and fast way to depressurize the chamber so you don't overshoot your extraction (which I didn't have at the time of the recording). All great points though!
Thought it worth mentioning. That's the intended operation of the robot (although you can create negative pressure in the basket by lifting the piston to stop extraction in that case). Came here through your blog post, whilst scouring the internet for information on the faema baby. I just bought a robot, and thought it'd be fun to find a faema to test side-by-side. This is quality content. What the internet was intended for!
Great work! how did you print the female threads for the brass connections? I would imagine getting these fittings into your plastic with enough of a seal to hold 9bar might be tricky
One big problem i can see here is that the CO2 cartrige releases really cold air which brings extraction temperature much lower than it sould probably be. How is you experience with that as the water for espresso should move above 95 degrees? Great idea tho looks sick😆
The specific heat of water is extremely high (5x that of CO2 gas). The amount of energy needed to raise the temp of 2g of CO2 gas (approximately how much gas is in the system during the entire extraction process) from 0C to 100C is 170J. That energy would lower the temp of 60g of water by 0.7 degrees C. I think it's safe to say maintaining water temp isn't a problem (and hasn't been for me in practice either)! :)
Amazing!! Am in love with this so much!! Am a student in university and been finding alternatives for espresso since the aeropress’ “espresso” just doesn’t cut it for me! Would love if there’s some way we could buy parts from you! Cheers btw! :)
Awesome design mate! I’d definitely recommend upping your puck prep. Doing WDT to get an even distribution, and then using a solid tamper would help with channeling and sputtering. Just for workflow wouldn’t a stand be nice?
Great idea but realistically speaking, I dont think the taste would be good with this version of the device. The changing bars of pressure, the way too short extraction plus the likeliness of lots of channeling inside the puck cuz all the water can only access the coffee bed through the holes. you poured in 60g of water for 18g of coffee which doesnt say much since i dont know the recipe but what came out of it was definitely not 60g. That being said, i might totally be wrong and am open to be proven wrong because that thing is simply such an amazing invention, that i could see people carry as a camping of to go solution.
Thankfully I don't have to speculate! Shots have been very good :) As with all machines, grind and puck prep are king so shot quality really has less to do with the setup and more to do with how well you dial the grind in. That being said, the actual device uses the cafelat Robot basket which, like most manual machines, is very forgiving in how it pulls shots. Pressure is very easy to control via compressed air which is what I use now. Using an digital electric air pump makes it even more consistent. Changing pressure (pressure profiling) is also a means to play with extraction, especially for lighter roasts. I rarely pull 9 bar shots on my Decent ever. I would hope 60g of water doesn't come out! With an 18g dose, 60g of water yields a 2.5:1 ratio shot which is well within what's considered an espresso.
everything you criticised would be the exact same thing for a Cafelat Robot, since the brewing chamber looks identical. As a owner of Cafelat Robot i can gurantee that it is able to produce fantastic espresso. I also own a e61 machine, so i have something to compare it to.
In my experience pulling shots with CO2 and compressed air with two different pumps, there's no perceptible difference in crema or taste. CO2 solubility is very low at that water temp and pressure
Way cooler than any portable espresso machines on the market. The lock-on mechanism with that 4 screws is genius.
Time for James Hoffmann to give it a go!
He has to see this !!!!
wow, this is really impressive! That espresso looks really good. Great work and creativity
Thanks!
But even bad shots *look* good.
@@theledman Is it safe to use for your health or does it leak microplastics?
Ha that's pretty cool you used a compressed air canister. Maybe you can try to make a PID controller for the valve to maintain a steady pressure as your next step!
The parts from cafelat robot work well for u.Paul will be proud.
When I see these I think cool, but then why not just robot, gain greater control and reduce operating costs?
@@dmackle3849 i mean i'd rather have a robot too but this is about $330 less and a fun challenge to see if it was possible :)
@@theledman sure and I also appreciate the experiment. But that $330 is shrinking with every cup and will eventually go negative. Plus the external dependency doesn’t tick my prepper box.
@@dmackle3849 The robot is way heavier and pretty big. Compared to a big machine its small, but i coudnt imagine taking it to work.This machine on the other hand... You could also probably reduce ongoing costs bu using bigger co2 cylinders. Woud make it heavy though
As a barista with a 3D printer, your design is simply amazing. The quality of the espresso looks amazing considering the sercomestanses. The creamer and colour of the espresso looks just like from a normal $3000+ machine.
Does the CO2 cartridge affect the taste?
Sorry this is an unlisted video so I didn't see this until now.
I've added an addendum to the bottom of my original blog post. Tl;dr, no it does not impact taste because CO2 solubility in nearly boiling water is extremely low.
That's a fascinating spelling of circumstances
This thing looks fantastic!
Id love to give it a try.
It'd be interesting to compare the flavor of espresso pressurized with CO2 vs N2O (aka whip-its). You should be able to find N2O canisters compatible with your pressure valve.
Is that a co2 cartridge?
Im workimg on a few espresso designs...one was using parts from a soda stream!
Nice!
Great idea! Pls make more stuff like this!
Amazing work!
Remember that water is incompressible. Fill the basket almost full, and weigh output instead of input. It will build pressure quickly and use less co2 per shot this way. You will also have less thermal losses because you have a bigger thermal mass of water.
While this is all true, you would need a pop valve or some easy and fast way to depressurize the chamber so you don't overshoot your extraction (which I didn't have at the time of the recording). All great points though!
Thought it worth mentioning. That's the intended operation of the robot (although you can create negative pressure in the basket by lifting the piston to stop extraction in that case).
Came here through your blog post, whilst scouring the internet for information on the faema baby. I just bought a robot, and thought it'd be fun to find a faema to test side-by-side.
This is quality content. What the internet was intended for!
Great work! how did you print the female threads for the brass connections? I would imagine getting these fittings into your plastic with enough of a seal to hold 9bar might be tricky
One big problem i can see here is that the CO2 cartrige releases really cold air which brings extraction temperature much lower than it sould probably be. How is you experience with that as the water for espresso should move above 95 degrees?
Great idea tho looks sick😆
The specific heat of water is extremely high (5x that of CO2 gas). The amount of energy needed to raise the temp of 2g of CO2 gas (approximately how much gas is in the system during the entire extraction process) from 0C to 100C is 170J. That energy would lower the temp of 60g of water by 0.7 degrees C. I think it's safe to say maintaining water temp isn't a problem (and hasn't been for me in practice either)! :)
Absolutely amazing! I’m thinking I may model my own after this..
Any new versions/issues since upload?
Stunning 🙌🙌🙌🙌
great!
Wonderful design. Nice crema, looks like a better way to do this than handpresso.
Vaya! Muy interesante. Gracias x compartir
James Hoffmann you have a 3D printer and no excuse :P
Hi,interested in 3D files/BOM
looks cool.. would be better with a piston driving the extraction instead of CO2 cooled air, and a pressure release valve.
agreed, though you can't 3d print a piston. target goal was inexpensive, simple, and the ability to pressure profile
Is there any update with the file? I read your blog 2 years ago and it says you will post. Thanks in advance.
Leave to brew for 30 sec, then you should get a better brew, but yeah James needs to review this.
jesus christ this is god tier
excellent 👌
Why this wasn't in my recommendation list earlier????
Nice Pebble time steel you got there :)
Have got the .stl for print ?
Amazing!! Am in love with this so much!! Am a student in university and been finding alternatives for espresso since the aeropress’ “espresso” just doesn’t cut it for me! Would love if there’s some way we could buy parts from you! Cheers btw! :)
Awesome design mate!
I’d definitely recommend upping your puck prep. Doing WDT to get an even distribution, and then using a solid tamper would help with channeling and sputtering.
Just for workflow wouldn’t a stand be nice?
very wowwwwww
ATF hates this video
wow
You had any progress updates on this since the HaD article?
There is slow but steady progress on the next version 😀
How much?
Great idea but realistically speaking, I dont think the taste would be good with this version of the device. The changing bars of pressure, the way too short extraction plus the likeliness of lots of channeling inside the puck cuz all the water can only access the coffee bed through the holes. you poured in 60g of water for 18g of coffee which doesnt say much since i dont know the recipe but what came out of it was definitely not 60g.
That being said, i might totally be wrong and am open to be proven wrong because that thing is simply such an amazing invention, that i could see people carry as a camping of to go solution.
Thankfully I don't have to speculate! Shots have been very good :) As with all machines, grind and puck prep are king so shot quality really has less to do with the setup and more to do with how well you dial the grind in. That being said, the actual device uses the cafelat Robot basket which, like most manual machines, is very forgiving in how it pulls shots. Pressure is very easy to control via compressed air which is what I use now. Using an digital electric air pump makes it even more consistent. Changing pressure (pressure profiling) is also a means to play with extraction, especially for lighter roasts. I rarely pull 9 bar shots on my Decent ever.
I would hope 60g of water doesn't come out! With an 18g dose, 60g of water yields a 2.5:1 ratio shot which is well within what's considered an espresso.
everything you criticised would be the exact same thing for a Cafelat Robot, since the brewing chamber looks identical. As a owner of Cafelat Robot i can gurantee that it is able to produce fantastic espresso. I also own a e61 machine, so i have something to compare it to.
I wonder how the CO2 contribute to the crema and taste. Any info on this?
In my experience pulling shots with CO2 and compressed air with two different pumps, there's no perceptible difference in crema or taste. CO2 solubility is very low at that water temp and pressure
Looks very watery:( I think the original Robot does it better.
Probably need more tamping or finer grind
too interesthing!!
Garbage in garbage out.. add safety valve just incase this might kaboom
Nerd.