How to add an always on fan to Ramps1.4

I have a 12v 40mm fan I want to use to cool the stepper drivers on the my Ramps. How should I power the fan from Ramps 1.4? Or could I connect it directly to 12v power supply?

Marked "Extruder Fan" always on 12v

Edited 1 time(s). Last edit at 06/02/2015 06:08PM by madmike8.

I run mine from the power supply.

Quote
lunarkingdom
I run mine from the power supply.

Yes - there is no real advantage to powering an always-on fan through the RAMPS. Also note that the image labeling above is a bit misleading. The thing labeled "electronics fan" is actually the power input to the RAMPS board. However, you CAN tap off of here to power anything that uses 12 volts (provided your PSU has capacity). This includes both an electronics fan and an always on extruder fan.

Thank You