Using one power supply for a printer and a computer

The title says it all, I want to use one power supply to power both a printer and a computer. Specifically, I already have a Corsair CX 500M, which can deliver 38 amps on its 12 volt rail. My computer has Haswell i5 and no graphics card. Pcpartpicker says it should consume ~180W at peak load, which I wouldn't run it at if the printer was also running.

I was thinking of sacrificing the 6+2 pcie power connector(s) for the ramps board and sacrifice a molex connection to supply 5V to the servo and a fan.

Any thoughts on this? I think in theory it would work, but I just wanted to know if anyone had any insight on if I should / shouldn't do this.

It has been discussed before and I don't remember any negative comments.
Be sure the wire gauge is sufficient for the current drawn by the printer.
-Olaf

@o_lampe

Ok thanks. I was thinking of getting two six pin pcie extensions and sacrificing those, meaning I would have 6 12V and 6 ground wires, and then give the 11A input 4 wires and the 5A input 2 wires. Is there a better way to distribute the wires?

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Is there a better way to distribute the wires?

Sounds good to me.

Some people also use a 5v wire to power the boards logic ( and servos etc. )
You could feed 5V to an empty endstop header or a servo header, but you have to disconnect "D1" on the Ramps before.
-Olaf

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o_lampe

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Is there a better way to distribute the wires?

Sounds good to me.

Some people also use a 5v wire to power the boards logic ( and servos etc. )
You could feed 5V to an empty endstop header or a servo header, but you have to disconnect "D1" on the Ramps before.
-Olaf

Thanks, I knew that I could power the servo by hooking up a 5V wire there, but I didn't know I would have to disconnect "D1."

This is NOT a good idea!

Maybe use computer power supply to power coffee maker and toaster?

With power supplies being so inexpensive'
Separate power supply and the isolation better

Long high current wiring + high current connectors not optimal

Fritz the supply --- No computer, No printer

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cozmicray
This is NOT a good idea!

Maybe use computer power supply to power coffee maker and toaster?

With power supplies being so inexpensive'
Separate power supply and the isolation better

Long high current wiring + high current connectors not optimal

Fritz the supply --- No computer, No printer

Well, this option saves me at least $25 and since nothing is going to blow up, I don't see why not. The printer is going to be like putting a high end graphics card in my computer; it hopefully won't cause a problem. Regardless, thanks for the warning, and I will probably get a dedicated psu in the future, but right now I rather not spend the extra money.

Expensive fires are caused by cheap incendiaries.

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Giantkiller
Expensive fires are caused by cheap incendiaries.

I don't think i would start a fire; the power supply could easily handle that kind of load. Anyways, I have a friend that has an extra atx power supply. Even though it isn't as good, I think a dedicated power supply is a good idea so I'm using it instead.