PSU Blew Up

In the middle of a print my PSU started crackling, popping, sparking and giving off smoke. Any ideas what might cause that? It has printed for hours, running an Azteeg X3. It is a 12v 30A switching supply, and has a fan and LED strip connected to the same terminal block on the board.



I don't see any obvious shorts, at least not between the wires on the screw terminals

Mine gets hot, so I use a 120mm fan (low speed, covers the entire surface area) to blow on it, and I use a 40mm fan on the Azteeg X3 as the DV8825 because they get hot as well. No problems so far.

Unlike a big old transformer, the componants in swithchmode power supplies are stressed more, and if
the componants are not of good quality are liable to failure in my experiance, this is not based on
electronic expertise, but practicle observation, so may be wrong.

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Random Precision