it looks like you have tried to pull the power from the Ultimaker board rather than use the heatbed output to drive a relay? i couldnt open the wiring drawing to check so I'm just going off the picture. I've said this before but I'm going to say it again, yes it is nice to be able to run a hotbed from the Ultimaker board but there is a lot that can go wrong with expensive results. There is a kit on ebay which includes everything you need to run a stand alone system and its half the price of a replacement Ultimaker main board. You may be able to repair what you have but once you have replaced the components that have obvious damage, you will probably find others and may take some time.
Paul
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gr5 2,243
That sounds like it should have been okay. I would have plugged in the UM first, but I can't think why that would be a problem. My head is sleepy - I'll read this again in the morning.
Are you sure you didn't hook up the 12v supply backwards?
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