Of power supplies. Bought one of the dc power as plies recommended here after

3D Printing
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Of power supplies. Bought one of the dc power as plies recommended here after the ATX supply failed. After a month or so, its starting to spontaneously power down. So I bought a higher rated (12v 30 amp) supply. Both came from Amazon curated suppliers. The first one looked kinda squished on arrival, but worked okay for a bit. The second one is ALSO slightly tweaked. The case looks okay, but the warranty sticker looks like its been tampered with. What the hell does it take to buy a good, unmolested, power supply!?!

The second I was going to hold onto for the second printer as the first supply started working okay for another 7-10 days. Ir started afting up again tonighy and tomorrow is the last day the return is good for so I figured I’d ask y’all one last question before shipping it back:

There are three 12v lines. I have a molex wired in to one pair, and it drives the rumba+a 12v fan for cooling. Would it be worth running the cooling fan and e3d off a second pair, or doss it all come from the same source internally?

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Get a meanwell power supply. You won’t regret it. Their SE series is great.

http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_2149503_-1

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I’ve had reasonably good luck with meanwells. Just, make sure your load is going to be within the ps recommended operating range. Meanwells tend to do odd things if operated in non-standard conditions – like, open-circuit voltages are nowhere near spec.

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Be carefull with 30 amps supply. It worked well for one week then while running for a longer print it burned my Aduino

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Hmph…wired in the new power supply (with is 40 amps, not 30…bought it with the plan to power a heated bed.) Printer still drops power while starting to print…now I’m leaning towards those poly-fuses on the Rumba.

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When you say “drops power” – entirely? or does it just sag for a while? In the first case, yeah, fuses are likely, in the second, I’d be looking at the wire gauges and trying to figure out where the voltage drops are.

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Everything goes dark, connection drops, then everything comes back up. If i go to blade fuses, what Amperage do you think i should use? 10amp?

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Think its the known USB issues on the rumba? Also I know @Tim_Rastall is no longer a rumba fan!

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I’m kinda low on discretionary income “Hey, lets drop another $200 to replace the Rumba you already dropped $80 to replace” just isn’t in the cards right now. :wink:

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I hear ya. Hope you can just tie it back to the poly fuses. Grab some from blade fuses an solder on some leads to test if the problem goes away.

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I’m certainly not a RUMBA fan. I’ve had nothing but problems with them.

Kill the polyfuses, and see what options you have for soldering in blade fuse holders. Somehow I don’t think your power supplies are the culprit if you keep burning them out.