What are the pros and cons of adding a RPi Zero W to the Original Prusa i3 MK3S Kit?
 

What are the pros and cons of adding a RPi Zero W to the Original Prusa i3 MK3S Kit?  

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bobstro
(@bobstro)
Illustrious Member
Posted by: rmm200

[...] Don't forget the converter - lets you run the Pi off the 24 V supply. No extra wires or wall warts. 

Hmm. I've read plenty indicating that the Mk3 power supply is barely sufficient to keep up with a printer running at hot nozzle and bed temps. There's also the problem of making the device you're monitoring dependent on the device being monitored. I'm more inclined to run a (relatively) power-hungry RPi 3B off external power (along with all the 12V lighting). I'm eventually going to get around to working up a UBC to consolidate my RPi and lighting power, but keeping it separate from the Mk3.

My notes and disclaimers on 3D printing and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan...
Posted : 23/07/2019 6:39 am
rmm200
(@rmm200)
Noble Member
Posted by: bobstro
Posted by: rmm200

[...] Don't forget the converter - lets you run the Pi off the 24 V supply. No extra wires or wall warts. 

Hmm. I've read plenty indicating that the Mk3 power supply is barely sufficient to keep up with a printer running at hot nozzle and bed temps. There's also the problem of making the device you're monitoring dependent on the device being monitored. I'm more inclined to run a (relatively) power-hungry RPi 3B off external power (along with all the 12V lighting). I'm eventually going to get around to working up a UBC to consolidate my RPi and lighting power, but keeping it separate from the Mk3.

Well I did pick up a Mean Well LRS 350 PS - just in case... It was only $30. Less than the PI.

Posted : 23/07/2019 6:44 am
paul.m27
(@paul-m27)
Honorable Member

I definitely want my Pi running off a separate supply.  I turn my mk3 off when I'm done, and I don't want to "sudo shutdown" the pi everytime.  99.99% of the time it would be ok just dropping the power on the pi, but that 0.01% of the time can lead to file corruption if it is writing to SD mid-yank.  

I leave the pi running 24/7 and can upload files to it from wherever, then print when I get home and turn it on.

Posted : 23/07/2019 4:08 pm
Nikolai liked
--
 --
(@-2)
Illustrious Member

One side note, if you swap power supplies, not sure the Power Panic Board inside the OEM supply is compatible ... so at the least plan you'll lose Power Panic restarts.

It is always wise to get more than one opinion... as for trusting Prusa? No way man....
Posted : 24/07/2019 12:45 am
paul.m27
(@paul-m27)
Honorable Member
Posted by: Tim

One side note, if you swap power supplies, not sure the Power Panic Board inside the OEM supply is compatible ... so at the least plan you'll lose Power Panic restarts.

True, maybe.  

On my original Mk3 and (I think) older Mk3s’s, they had the silver power supply with the black printed base.  This had some reliability issues early in Mk3 days (I lost two in a month before I switched to a meanwell).  With that version you could disassemble the bottom of the PSU and switch the power panic board to a new printed base for the meanwell (I put one on thingiverse, there were better remixes).  

However, on my new mk3s it’s got an integrated black PSU, no printed bottom.  You’d have to open the PSU and I’m not clear the power panic board is easily extractable.

Posted : 24/07/2019 1:41 am
GregoryG
(@gregoryg)
Active Member

@guy-k2

What pi version are you using

0 3 or 4?

Posted : 17/07/2020 3:43 pm
GregoryG
(@gregoryg)
Active Member

@guy-k2

What pi version are you using

0 3 or 4?

Posted : 17/07/2020 3:46 pm
GregoryG
(@gregoryg)
Active Member

@paul-m27

Hi I'm new here

Did a couple of prints

But want to add pi

From these post I'm convinced to use the pi 3 or 4

But can someone helpme in how to add its designated power and how to hook it up please ty

Posted : 17/07/2020 4:01 pm
JMcK
 JMcK
(@jmck)
Estimable Member

@recovery

The simplest approach is just to use a separate power supply for the Pi. For my Pi 3 I found that the USB-to-micro usb cables can be pretty sensitive, and I did see a bunch of under volt/throttling in the Octoprint UI. While my generic phone charger worked well, I’d reco stick with an ‘official’ pi power supply for stability, at least with the 3’s. I very recently upgraded to a Pi 4 (2Gb) and it’s been much more stable for me, using an Apple USB-C iPad charger. But again, that’s just my experience. I think 3b, 3b+, and 4 are all winners, even if you add a camera.

I’m not sure about the “how to hook it up portion” of your question... but the Pi gets powered by a USB port on the longer edge. Micro USB for the 3’s and USB-C for the 4’s. I wouldn’t recommend powering it from the Prusa’s power supply. So you basically plug it in like your phone. A usb cable hooks the pi to the printer. The one that came with it for flashing firmware will do, but a right-angle on the printer’s end is a lot cleaner looking.

If you want to attach the pi to the printer, there are hundreds of printable designs out there. I’m partial to my own, obviously. https://www.prusaprinters.org/prints/36102-pi-4-case-for-prusa-mk3mk3s
https://www.prusaprinters.org/prints/1668-pi-3b-case-for-prusa-mk3

 

When someone asks you if you're a god, you say, "YES!"...
Posted : 17/07/2020 6:19 pm
Bunny Science
(@bunny-science)
Noble Member

Pi 3B+ boards on my Prusas. I started with a zero, but very quickly switched to 3B+ boards to allow more CPU headroom with continual webcam usage. Also added cooling fans to my Pi's.

Posted : 17/07/2020 7:25 pm
Bunny Science
(@bunny-science)
Noble Member

Just like @paul-m27 I keep the pi's on 24/7 on their own power supplies. 

Posted : 17/07/2020 7:27 pm
GregoryG
(@gregoryg)
Active Member

@joe-m14

Great Joe

Thanks a lot

Posted : 17/07/2020 7:58 pm
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