Is it possible to Run PC and Prusa i3 Hephestos off same pc power supply I have a spare pc which i am going to dedicate to my 3d printer, i was hoping i might be able to put the tower flat on the desk and place my prusa i3 hephestos on top of it i would also like to run the 3d printer from the atx inside the pc. The reasoning behind this is i will have it in another room and i would like to be able to network boot the pc and when it turns on it will also power up the prusa i3 hephestos. I am hoping to be able to use a remote desktop connection to print things and monitor the prints via a netwrok camera. Some facts about my setup: The PC The PC is relativly old by today standards but its running Windows 8.1 on a intel Dual core 1.6GHZ with 2GB Ram. Power Supply is 450W but i can upgrade if needed. Prusa i3 hephestos Standard issue only had it a few days, no heated bed or anything fancy like that so its not drawing to much power. Is this possible? Thanks in advance for any helfull info. https://reprap.org/forum/read.php?1,524239,524239#msg-524239 Mon, 08 Jun 2026 06:53:57 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,524239,524588#msg-524588 Re: Is it possible to Run PC and Prusa i3 Hephestos off same pc power supply https://reprap.org/forum/read.php?1,524239,524588#msg-524588
Thanks for your help, i will test this tonight.]]> costablanca_pi3 General Mon, 22 Jun 2015 04:50:06 -0400 https://reprap.org/forum/read.php?1,524239,524585#msg-524585 Re: Is it possible to Run PC and Prusa i3 Hephestos off same pc power supply https://reprap.org/forum/read.php?1,524239,524585#msg-524585 -Olaf]]> o_lampe General Mon, 22 Jun 2015 04:47:20 -0400 https://reprap.org/forum/read.php?1,524239,524577#msg-524577 Re: Is it possible to Run PC and Prusa i3 Hephestos off same pc power supply https://reprap.org/forum/read.php?1,524239,524577#msg-524577
Quote
o_lampe
I´d say 1 yellow to 5A, two yellow to 11A input. Same for black. Use ferrules everywhere to make safe clamping contacts.
You can also route one black and red to the servo-terminal block of the RAMPS. This way, you can overcome problems with the weak 5V regulator from the arduino mega.
-Olaf
.


If you take a look at this diagram it shows the wiring provided by the manufacturer BQ i am currently only using the the 5A terminals to power the whole printer, so shall i just use 2 yellow and 2 blacks. The power supply they provide is just like a standard laptop charger and its output is 12V 8.0A,

Thanks again for your info, once we get this last question out of the way i will feel confident enough to start putting my idea into practice.]]> costablanca_pi3 General Mon, 22 Jun 2015 04:22:05 -0400 https://reprap.org/forum/read.php?1,524239,524557#msg-524557 Re: Is it possible to Run PC and Prusa i3 Hephestos off same pc power supply https://reprap.org/forum/read.php?1,524239,524557#msg-524557 everywhere to make safe clamping contacts.
You can also route one black and red to the servo-terminal block of the RAMPS. This way, you can overcome problems with the weak 5V regulator from the arduino mega.
-Olaf

@Lance
How could one fry the hole tower with a shortcut or failing PSU? The onboard connector stays untouched. As long as you don´t drop a live 12V cable on the mainboard, there is no risk.]]> o_lampe General Mon, 22 Jun 2015 03:08:04 -0400 https://reprap.org/forum/read.php?1,524239,524480#msg-524480 Re: Is it possible to Run PC and Prusa i3 Hephestos off same pc power supply https://reprap.org/forum/read.php?1,524239,524480#msg-524480
as a person who's fried.. 4+ PSU trying to jerry rig old PC PSUs (I've learned a bit about what not to do with Wiring)

My only question is how would you feel if you fried your tower, instead of buying a dedicated PSU?
[store.makerstoolworks.com]
worth it. Note thats the 24V not a 12v

That said, some lessons have to be learned first hand. Buy real connectors, don't do this half assed like I did the first time. Make sure the connectors can handle the load, another lesson. Go all out with your shrink tubing too.
You're going to be cutting a 12v rail normally for a high end graphics card (usually..) that will have 2 - 3 black, ditto for yellow. Those will be enough. Less wires, more resistance at the connectors, more chance for FWAHOOM! 12v to ground is very exciting!]]> L4nce0 General Sun, 21 Jun 2015 20:14:18 -0400 https://reprap.org/forum/read.php?1,524239,524305#msg-524305 Re: Is it possible to Run PC and Prusa i3 Hephestos off same pc power supply https://reprap.org/forum/read.php?1,524239,524305#msg-524305
I'm just using onboard graphics so no issues there.

Do you know how many of the black and yellow wires I will have to use to power the printer?

Thanks]]> costablanca_pi3 General Sun, 21 Jun 2015 11:43:13 -0400 https://reprap.org/forum/read.php?1,524239,524300#msg-524300 Re: Is it possible to Run PC and Prusa i3 Hephestos off same pc power supply https://reprap.org/forum/read.php?1,524239,524300#msg-524300 It would work, if your PC doesn´t have one of these power demanding graphic cards. If it has one of those, it is still worth a try
Putting the printer directly on the housing will be pretty noisy. Some vibration damping would reduce that.
It will be a tight fit for the printer, maybe double sided servo-tape helps the printer to stay.

When you´d put the controller in the PC housing, this would eliminate the need for a separate fan.
-Olaf]]> o_lampe General Sun, 21 Jun 2015 11:26:30 -0400 https://reprap.org/forum/read.php?1,524239,524239#msg-524239 Is it possible to Run PC and Prusa i3 Hephestos off same pc power supply https://reprap.org/forum/read.php?1,524239,524239#msg-524239
Some facts about my setup:
The PC
The PC is relativly old by today standards but its running Windows 8.1 on a intel Dual core 1.6GHZ with 2GB Ram.
Power Supply is 450W but i can upgrade if needed.

Prusa i3 hephestos
Standard issue only had it a few days, no heated bed or anything fancy like that so its not drawing to much power.

Is this possible?

Thanks in advance for any helfull info.]]> costablanca_pi3 General Sun, 21 Jun 2015 07:53:12 -0400