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Electricflow
(@electricflow)
Active Member
PSU - What is the replacement PSU for the MK3?

I noticed there is not replacement PSU instock on Prusa site.    Is there a replacement listed? Should I just pick my own that will work?

 

V/R

 

Posted : 16/01/2022 6:53 am
JoanTabb
(@joantabb)
Moderator
RE: PSU - What is the replacement PSU for the MK3?

Have a word with the agents on the Chat Option, they may be able to help?

If you buy a different power supply, you will need to model a new protective box for the power connections and power switch
When I did that I needed to make a new box for the bottom, and a new interface panel to match the fixing screws to the frame, because the power supply fixings were in a different location 
I got a 24vole 15 amp power supply for my Frankenprusa...   to give a bit of headroom (normal prusa power supplies are 24 volt 10 amp)

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 16/01/2022 12:00 pm
Electricflow
(@electricflow)
Active Member
Topic starter answered:
RE: PSU - What is the replacement PSU for the MK3?

Seems like a new supply is the optimum path.   

I keep my PSU outside a cabinet and don't have it mounted to the printer, needed to design a new mount for it already.  

Any brands people like? I have seen mean well mentioned.  Do people find the self cooling vs the fan cooled supplies more reliable? 

Thanks for the help 

Posted : 16/01/2022 3:38 pm
Chicago Keri
(@chicago-keri)
Estimable Member
RE: PSU - What is the replacement PSU for the MK3?

 

It seems that fanless PSUs  small enough to fit on a Prusa top out around the 250w range.

The standard fanless black Prusa PSU is made by Delta, an excellent PSU manufacturer.  Delta PSUs are usually a bit more expensive.

Meanwell is well-regarded in the community and is relatively cheap.  Although cheap in price, Meanwell PSUs are usually well made with decent safety and interference suppression. Being cheaper, they might not have the life expectancy of a Delta, for example.

The no-name "knockoff" PSUs are best avoided. These are usually very cheap, have substandard or even secondhand parts and have little or no interference suppression which can wreak havoc with anything electronic nearby, and might even pose a fire or electrocution risk.

 

The Meanwell LRS-350 is very popular for 3D printing but has an incredibly annoying fan.  The 60mm "slim" fan is not silent, but the stamped fan grille in the case give it an intensely annoying character. A simple mod to reduce the noise is to cut out the stamped grille and replace it with a wire grille or even a 3D printed one. More invasive mods  involve replacing the fan with a quieter one but one must be careful to maintain adequate airflow / cooling. 

¡no entiendo Español!
Nein! Nicht Versteh!
Я немного говорю по-русски но не очень хорошо, и...
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Posted : 16/01/2022 5:41 pm
Swiss_Cheese
(@swiss_cheese)
Noble Member
RE: PSU - What is the replacement PSU for the MK3?

@electricflow

 I replaced mine with this, (Mean Well NES-350-24 24V 350 Watt UL Switching Power Supply 120 Volt) it can be switched to 240V built in. It's not a direct swap you have to print some parts to mount it to your printer, my original power supply died after only one year, I ordered another from Prusa but it took so long to get to the states, I ordered this one while waiting hot wired it printed the parts and was printing for two weeks before the new delta got here from Prusa. also the prusa power supply was 100-ish $ US the Meanwell  was 30$,  $65 now at the time of writing this and has proved to be unstoppable. I still have the Delta from Prusa in a box, waiting. I can strongly recommend the Meanwell.  do your research since replacing mine I have seen countless parts made to attach and house the Meanwell as well as schematics  for proper wiring should you need that kinda thing.

 

Good Luck

 

Swiss_Cheese

The Filament Whisperer

Posted : 17/01/2022 5:21 am
JoanTabb
(@joantabb)
Moderator
RE: PSU - What is the replacement PSU for the MK3?

i had an example of a poor switch mode power supply, that was supplied as a replacement for a netbook... 

with the power supply plugged in to the mains, there was enough interference to wipe out three different broadband services (that I know about... there may have been more...

 

the interference was induced from the mains into the Telco wiring. and even prevented the engineers battery operated test equipment from working...

I scrapped that power supply...

regards Joan

 

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 17/01/2022 3:11 pm
Electricflow
(@electricflow)
Active Member
Topic starter answered:
RE: PSU - What is the replacement PSU for the MK3?

You almost have to try to make a power supply that bad

 

Posted : 23/01/2022 4:04 pm
JoanTabb
(@joantabb)
Moderator
RE: PSU - What is the replacement PSU for the MK3?

I think it would be difficult to purposefully design something that bad / effective... 

🙂

Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 24/01/2022 12:40 am
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