Cooling fan is turning on and off.

Question

Hi. I've just added a parts cooling fan to my diy 3d printer. It worked fine until the fan started to turn off and on again on its own. It ignores the fan speed setting and I can't even turn it off in Repetier host. I've tried a diferent fan but the result was the same. Controller board is Ramps 1.4

Robert Peter Oakes · Accepted Answer

See Wiring Glad you solved it…

Robert Peter Oakes · Answer

It sounds like you have wired it up wrong

Can you provide close up pictures and a diagram on how you wired it, I have 3 RAMPS 1.4 boards and they work ok, I also just added parts cooling to a MKS board with no issues. but based on your description it defiantly sounds like a wiring issue

DAB · Answer

I am not surprised. The hotbed is needed to keep the material in a state so that it sticks each layer together. When you turn on the fan, you change to environment around the material and cause it to cool too quickly, which defeats the purpose of the hotbed. So when you think about it, you only want one or the other on, not both. DAB

Cooling fan is turning on and off.

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