Ramps Fan Extender

Ramps Fan Extender lets you add 2 temperature controlled fans for your hotend and drivers on the RAMPS 1.4 board while retaining the ability to control the D9 fan using LCD or the M106 Gcode for the printbed.

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Last Updated: 05/29/2024




Ramps Fan Extender is a plug and play solution to mount the FAN for DUAL-EXTRUSION setups with RAMPS 1.4. But instead of adding only one additional output port the RRD-FAN-EXTENDER is equipped with 2 PWM controllabe channels(D6/D11). The second channel can be used for another fan (e.g. to cool the stepper driver) or for adding light control (e.g. add dimmable LED light to your machine).


  • Max Voltage: 20V DC
  • 2 (PWM controllable) channels (D6/D11)
  • max 0.5A per channel (enough for a really big fan)
  • flexible output voltage (you can connect the RRD-FAN-EXTENDER to 12V,5V,... in order to support the output voltage you need)
  • each channel has a fly back diode
  • easy setup (plug and play)
  • already supported by Marlin firmware (choose "#define MOTHERBOARD 34")
  • easy to adapapt to other firmware (e.g. Sprinter: just change "#define FAN_PIN 6" in "pins.h")
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