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Mara X

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#2,062 ·
Yes I think this one will works fine. You only need to connect the green and white cable.
mine is this one https://www.amazon.fr/Module-PL2303TA-vers-RS232-convertisseur/dp/B08HS9M3P9/ref=sr_1_5?__mk_fr_FR=ÅMÅŽÕÑ&dchild=1&keywords=PL2303TA+USB+vers+TTL+RS232&qid=1609692151&sr=8-5

it's the same as your, PL2303.

i have just tweak my raspbian kernel because sometime after a reboot the raspberry didn't configure correctly the serial port.

If you are also looking for a small hdmi screen, I have bought this one

https://fr.aliexpress.com/item/32801341185.html?spm=a2g0s.9042311.0.0.4bb36c37H3pSbE
 
#2,065 · (Edited by Moderator)
itguy said:
I have emailed Lelit directly just to ask them a few questions, with the PID different versions being one (in the context of steaming). They're closed until 8/1/21 so we'll see after that :)
Click to expand...
Wanted to suggest asking Lelit, then saw you already did. I remember when I emailed they were also on some extended holiday. They do seem to know how to live the life over there, lol. 🙂
 
#2,071 ·
Hi all, new to Mara X and was thinking about something. Reading from a few places I understood that after pulling the first shot, the best time frame to pull the second shot is somewhere between 1.5 to 4 (or 5) minutes before the temperature exceeds the target range and I'll have to wait another 15-20 minutes for it to cool down.

What about the scenario where I pulled the first shot AND steamed milk, does the above still apply? If yes, the 1.5 minutes is counting from the end of the first shot or end of steaming? If no, do I need to wait 15 minutes?

Overthinker here 😛
 
#2,072 ·
Hi,

@MediumRoastSteam and @PD2020 do you remember that i wrote, that i will send my machine to one good local service for check. They have found that my manometer was showing 9 bars but on the handle it was around 10.5 and as you can see from the image.

Now it is set 7.8 bars on marax manometer and on the handle is now 9bar. They brewed espresso on this setup with temperature set on 2 and told me that it is fine now with any coffee.

Maybe to much pressure caused to fast flow and underextraction problems but manometer fooled me.

I will try at monday.
 

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#2,073 · (Edited by Moderator)
Interesting. I thought that 10 bars on the MaraX pump pressure meter usually translate to 9 bars on the puck, so 1 bar less. In your case it translated to more - 10.5 bars.

My best shots so far have been between around 24-29 sec, which is way faster than anybody else I've seen on the Internet (given VST18, dose 18g, output around 30-54g, middle temp setting 93-94*C).

Is there any quick (hopefully inexpensive) way to check the actual pressure?
 
#2,075 · (Edited by Moderator)
PD2020 said:
I thought that 10 bars on the MaraX pump pressure meter usually translate to 9 bars on the puck, so 1 bar less. In your case it translated to more.
Click to expand...
Not only that: according to Garfield, the manometer was showing a lesser value than when measured at the group. (9 bar and 10.5 bar respectively). In a way, the opposite from what you said above.

Moreover, with a blind PF (as it's the case with the manometer at the group), as opposed to one where it simulates a bed of coffee, you'd expect the pressure in the MaraX gauge and the gauge at the group to have a similar reading. It's almost as if the MaraX pressure gauge is not calibrated properly (I.e.: reads 1.5 bar lower).
 
#2,076 ·
MediumRoastSteam said:
@Garfield - I'm glad you figured out what's going on. So, let me get this right: you sent the machine to them, they tested and tried coffee from it. They thought it wasn't good too. They then adjusted the pressure down and they now think it makes a change, so that the espresso is better?
Click to expand...
Yes. I have sent them everything, machine, grinder and coffee, even tamper 🙂

They tried first with my setup and found that salty taste in espresso. Then they adjusted it by lowering the pressure and increasing temp to 2 and said that coffee is great, like a juice. 8 people in service tried and said that it is great.

Servicer filled 18grams stock filter basket to full, slightly tapped by hand, grinded more into it and did not meassured extraction, but stoped on colour. It was finished around 28seconds after the first drop, so it is 40 and more with preinf. But he told me that i will have trouble to meassure extraction because of pump type. He also did a short flush ~2sec before locking handle.
 
#2,077 ·
Garfield said:
Yes. I have sent them everything, machine, grinder and coffee, even tamper 🙂

They tried first with my setup and found that salty taste in espresso. Then they adjusted it by lowering the pressure and increasing temp to 2 and said that coffee is great, like a juice. 8 people in service tried and said that it is great.

Servicer filled 18grams stock filter basket to full, slightly tapped by hand, grinded more into it and did not meassured extraction, but stoped on colour. It was finished around 28seconds after the first drop, so it is 40 and more with preinf. But he told me that i will have trouble to meassure extraction because of pump type. He also did a short flush ~2sec before locking handle.
Click to expand...
Excellent. I bet you can't wait. Keep us posted when you receive your machine back!
 
#2,079 · (Edited by Moderator)
PD2020 said:
How would you advise to check the actual pressure on the puck? In terms of accuracy is there any difference between a grouphead manometer and a portafilter manometer?
Click to expand...
Well... if you just want to check your gauge is accurate, I think you can make a DYI kit. Get a gauge off eBay and a 3/8 bsp adapter. Thing is, you'll need to unscrew the spouts, which are usually threadlocked. Or you attach a pressure gauge to the E61. I think it should be effectively the same for this purpose.

however, I'm disregarding water expansion as it gets hot in the group and not as hot, or not at all, in the capillary tubing which leads to the machine's pressure gauge. I don't know if that's on the cold or hot part of the machine. Water temperature difference could explain the difference in reading between the gauges as seen in@Garfield's machine. But I don't know for sure, as I don't know enough about the design of the machine or hydraulics.
 
#2,080 · (Edited by Moderator)
Guys what if the voltage of our house is not that stable will it caused the bar pressure not stable as well? Is it necessary to buy stabilizer for my espresso machine.. i afraid i might broke the mara x because the voltage of my in laws house.. huhu🙃

Btw does anybody try out hoffman new video prewet the puck before preinfusion 😁
 
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