The RRD-FAN-EXTENDER is exactly what you need in this case. It is a plug and plays solution to mount the FAN for DUAL-EXTRUSION setups with RAMPS1.4. But instead of adding only one additional output port, the RRD-FAN-EXTENDER is equipped with 2 PWM controllable 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 a dimmable LED light to your machine). Features: 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 flyback 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) Package Includes: 1 x RAMPS 1.4 RRD Fan Extender
