RAMPS 1.4 fan mount 40mm
by CivilEITprint, published
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Right beside your X-Axis Pololu chip just to the left is an innocent looking 2 pin connector, thats where your fan plugs in.to cool your chips. If it doesn't turn on, it could be because it's not enabled in your firmware. It's referred to as Pin 23 in Sprinter and Marlin. In the firmware you can also modify it's operation to run when it prints or keep it constantly running.
If you look at the pictures for Thing 30331, you can briefly see where fan plugs in.
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