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    Difficulty with using external Mosfet

    Dear Members,

    I have a 3D printer where I use a Ramps 1.4 and a 200x300 [mm] PCB Heatbed. I wanted to upgrade it with an external Mosfet but it haven't succeded so far. I followed the wiring which I attached. After turning on the heatbed in Simplify3D the bed started to heat up from room temperature to 40 degrees celsius, but the external mosfet and the heatsink of it also heated up so much within a few seconds that I wasn't able to touch it. I guess it is not supposed to work like this. It looked like an easy and few minutes upgrade but I failed. Could someone please help me what to change to make it work? I attached the parts I use, the wiring I followed and the wiring which was done by me.

    Thanking you in advance for your help.
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    Last edited by vikovarga; 12-06-2018 at 01:51 PM.

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