Annoying noise in new PSU

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This topic contains 5 replies, has 4 voices, and was last updated by  Matt saeger 1 year ago.

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    James Donnelly

    I recently installed a 30A 12V LED power supply to my printer so I can add a heated bed.

    It has the annoying habit of switching the fan on full every time current draw reaches a certain threshold.

    At the moment, with only the steppers and the hot end drawing power it’s coming on and off every few seconds.

    Anyone else have this?



    I know the power supply that runs my 3d printer will cycle the internal fan when the heated bed is running, so it’s normal.


    James Donnelly

    Fair enough, thanks. Hmm, maybe I’ll try a PC PSU mod – the noise is quite annoying.



    It should just be a very slight fan noise, if you are hearing something else maybe its rubbing on something in there. Unplug it and open it up.


    James Donnelly

    I might resort to that. Perhaps try a replacement higher quality fan.


    Matt saeger

    Yeah those things are loud the one I had on my 3D printer was very loud too. I opened it and the fan said it took a weird voltage like 16 volts so I didn’t try and replace the fan. I modded a corsair atx power supply and to use and it is silent. I ended up using the LED strip power supply on the MPCNC which I only use as a router outside so fan noise isn’t an issue.

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