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HBP Mosfet Fried

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I have been using a heated build platform without issue for PLA running 65C for the first layer and 50C for the print.

I just tried printing ABS and set the bed to 70C. Shortly after it reached 70C I noticed smoke coming from under the Ultimaker.

It was Mosfet for the heated build platform that was smoking. Can anyone tell me the specs for a replacement mosfet? A Mouse part number would be great! Commanding the build platform to heat no longer turns the heater on.

I am not sure, but I think the mother board fan might have caused the problem. I just noticed that the fan turns on when I first power it up, but after a minute or so the fan turns off. I think I will hook the fan up to an external power supply, but seems strange. Anyone have any idea about it turning off?


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I have the 1.5.6 board with 50amp mosfets. The mosfet is STP55NF06L which I ordered from Mouser for $1.40.

Meanwhile, I snagged the mosfet from heater 2 since I currently only use single extrusion, and, even after commanding the heated build platform off it is stuck on. I reset everything, and still on.

Any ideas?

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To heat up the 2nd extruder you need to use "M104 T1 Sxxx" The T part controls which extruder you heat up.

You could also swap the pin configs around, but then you need to compile Marlin yourself.

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