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? https://reprap.org/forum/read.php?1,516914,516914#msg-516914 Sun, 19 Apr 2026 16:52:20 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,516914,517311#msg-517311 Re: How to add an always on fan to Ramps1.4 https://reprap.org/forum/read.php?1,516914,517311#msg-517311 gmckee General Wed, 03 Jun 2015 14:27:37 -0400 https://reprap.org/forum/read.php?1,516914,517305#msg-517305 Re: How to add an always on fan to Ramps1.4 https://reprap.org/forum/read.php?1,516914,517305#msg-517305
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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.]]> jbernardis General Wed, 03 Jun 2015 14:19:05 -0400 https://reprap.org/forum/read.php?1,516914,516930#msg-516930 Re: How to add an always on fan to Ramps1.4 https://reprap.org/forum/read.php?1,516914,516930#msg-516930 lunarkingdom General Tue, 02 Jun 2015 18:46:44 -0400 https://reprap.org/forum/read.php?1,516914,516918#msg-516918 Re: How to add an always on fan to Ramps1.4 https://reprap.org/forum/read.php?1,516914,516918#msg-516918
Marked "Extruder Fan" always on 12v]]> madmike8 General Tue, 02 Jun 2015 18:07:36 -0400 https://reprap.org/forum/read.php?1,516914,516914#msg-516914 How to add an always on fan to Ramps1.4 https://reprap.org/forum/read.php?1,516914,516914#msg-516914 gmckee General Tue, 02 Jun 2015 17:59:38 -0400