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I've changed SD cards, printed from USB connection, upgraded/reloaded firmware and attempted using different software packages. Nothing has worked yet. When connected via USB, I get a "disconnected" error after a few minutes into the print. Also, the LED lights now either don't work at all or will randomly go out after a few minutes - usually indicating that the print failure is imminent. I've had the printer for about 4 years without issues. I don't want to replace the motherboard only to find out it's the power source or vice versa. Help?

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  • $\begingroup$ could be a power supply problem. if you reloaded firmware ok, mobo's core should be alright. mobo-driver connections might be an issue though. $\endgroup$
    – Abel
    Oct 3, 2021 at 17:15

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I recently had this problem and narrowed it down to the part cooling fan (on the side of the extruder head). I diagnosed the problem by noticing that the printer would reboot shortly after the second layer started, only on PLA prints. Of course, the part cooling fan is not usually started until after the first layer. It was shorted and when the printer got to the second layer it would overload the power supply and cause a reboot. Took a while to determine this, but it is worth looking at if somebody else is having this problem.

I would guess that any shorted fan, even the extruder fans, might cause a similar issue, however, I don't know this for sure.

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  • $\begingroup$ Welcome to 3D Printing SE and thank you for your contribution. When you get a chance, please take the tour to understand how the site works and how it is different than others. $\endgroup$
    – agarza
    Jan 11, 2022 at 23:23
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I had a similar problem with my Ender 3 that started after relocating the power supply to a (3D printed) bracket to give additional clearance from the edge of the bed (it was touching the magnetic build sheet, potentially causing prints to lift or warp at +X +Y corner).

What I found was that the brackets I had printed allowed enough movement of power supply to make the 24V output connection intermittent, even despite tightening the slip-on terminal. I solved the problem by printing another bracket piece that constrains the top of the power supply as well as the bottom (in the originally printed bracket); I haven't had a random restart during a print since then.

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