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Running extra fan off MK3S+ power supply?  

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Therevox
(@therevox)
Active Member
Running extra fan off MK3S+ power supply?

Wondering if I can run an extra fan off t he MKS3+ power supply. Does anyone know how much current the printer is drawing from the power supply and if there's any headroom left?

I'm looking at 24V fans that draw 0.5A to be used in a little DIY HEPA filter setup, and I'd love to wire it right into the power supply if possible. Or connect to the eintsy board if there's extra jacks available for fans?

 

Posted : 31/03/2025 9:12 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: Running extra fan off MK3S+ power supply?

I suspect the mmu3, with 3motors and a controller. Draws more than half an amp

My mk3s supports the mmu3 on its power supply

If you don't have an mmu3. You should be ok.

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 : 01/04/2025 11:31 am
Therevox
(@therevox)
Active Member
Topic starter answered:
RE: Running extra fan off MK3S+ power supply?

Oh good call, I had no idea the MMU takes power directly from the printer. Does it connect directly to the power supply, or are there unused headers on the PCB that I can tap off?

Posted : 01/04/2025 5:39 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: Running extra fan off MK3S+ power supply?

The MMU piggybacks the power leads on the bottom of the einsy controller board

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 : 01/04/2025 9:54 pm
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