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david herrera
(@david-herrera)
Member
Core One motherboard info

Good afternoon

I'm working on a new mod for my Core One and I need to know a couple of technical details about my Core One Buddy motherboard. I'm hoping someone can help me. The Core One Buddy motherboard has three fan headers: Fan 1, Fan 2, and Fan 3. Does anyone know the wattage output of the 4-pin Molex connector for Fan 3? I imagine it's 24V, but I want to know the exact voltage. I also need to know the maximum amperage that connector for Fan 3 can handle. I'm working on a new project that will be powered by this connector, but I need the exact technical specifications since they aren't included in the technical data sheet. Thanks

Posted : 20/02/2026 7:34 am
miroslav.h4
(@miroslav-h4)
Prominent Member
RE: Core One motherboard info

And how about looking at the Prusa website? If you look for a moment, there is a diagram of the Buddy board and you can find the required data there. I won't give you a direct link here, because a developer at this level should be able to find the information. And the link to the board diagram was also mentioned here.

Posted : 21/02/2026 7:38 pm
david herrera
(@david-herrera)
Member
Topic starter answered:
RE: Core One motherboard info

Yes, I already know that, I understand that much. The problem is that I need to know the maximum amperage that connector can handle. I already know the voltage, 24 volts, but not the maximum amperage, which, by the way, isn't in the specifications.

Posted : 21/02/2026 7:41 pm
mnentwig
(@mnentwig)
Honorable Member
RE:

mods are good...

possibly 2 A rating per pin, 2 pins => 4A. But, does the PSU budget allow this much? Seems unlikely it would just be overspecified by 100 W. So back to square one.

https://www.molex.com/en-us/products/part-detail/5031542290?display=pdf see 2nd page for current rating per contact.

Please confirm correctness of the information.

Edit: Actually this is not the fan connector but another one on the board, so you'll have to do a bit of work yourself 🙂 

This post was modified 18 hours ago 2 times by mnentwig
Posted : 21/02/2026 8:46 pm
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