for RepRap Ramps1.4 RRD Fan Extender 2 PWM Controllable Channels 3d Printer M B8
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AU $11.40
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The RRD-FAN-EXTENDER is exactly what you need in this case. But instead of. The second channel can be used for aher fan. If you build or upgrade your printer with/to DUAL-EXTRUSION (2 extruder) including a heated bed all the output ports (D8,D9,D10) will be used.