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This is somewhat related to the question I found here: Will a spike protector work in reverse?

I have a trusty old 3D printer running on the same power strip as my two computers including a screen.

Whenever I turned on the printer, my screen would turn off for a short moment before turning back on.

A few weeks later my screen would turn off and on continously, and when checking the connections of the screen I realized sparks were flying between the screens back plate and the display cable. The screen's warranty had of course ended a few months ago and I had to replace it in fear of fire hazard.

With my new screen, on the first time I turned the printer on, it too started turning off and on continously, even after unplugging the printer. I suspcted the worst, only now all puzzle pieces falling together. What if the printer produces a power surge when turned on and fried both my screens? Fortunately after plugging my screen into a different strip (and thus also performing a hard power reset on the screen) the problem seems to have subsided.

Now for my actual question, is there a way I can protect my devices from the 3D printer? Could I use a power surge protector between the printer and the power strip? Or plug in the power strip into a power surge protector and then into another power strip with the printer attached to it as well?

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    Could be your display cable is wonky/bad or screens are defective. Would try to put the 3D printer on another house circuit with a different breaker. Sparks at a connection is a sign of a bad connection, not a power surge.
    – crip659
    Nov 18 '21 at 11:22
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    I doubt a surge. More likely is a drop in voltage when the 3D printer starts up. Put it on a different circuit. Nov 18 '21 at 13:41
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I agree, this is not the millisecond sort of surge that surge protectors are designed to work with.

This is a power loss problem. I suspect a problem in the power strip or the receptacle is causing a high resistance connection. I would watch out for any plug connections getting warm, as that is serious and could start a fire.

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