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- 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 dimmable LED light to your machine).

  - Support Max 20V - 2 (PWM controllable) channels (D6/D11) - Easy to install, Plug and Play - Support per channel Max 0.5A, enough for a big fan  - Flexible output voltage (you can connect the RRD-FAN-EXTENDER to 12V,5V,... in order to support the output voltage you need) - Already supported by Marlin firmware (choose "#define MOTHERBOARD 34") - Easy to adapt to other firmware (e.g. Sprinter: just change "#define FAN_PIN 6" in "pins.h")

1. You need Marlin firmware v3 or newer. If you are using the older firmware, you must re-flash your board. 2. Power up, two connecting fans will take turns to rotate. 3. Can be connected follow the description picture.
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  Package included:   (The fan and the board are not included)