prusa i3 - How can I add an extra fan, controlled by a microcontroller, to my board? - 3D Printing Stack Exchange
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Configuring and Using Reprap Ramps1.4 RRD Fan Extender : 3 Steps - Instructables
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2pcs/lot 3d Printer Parts Reprap Ramps 1.4 Rrd Fan Extender Expansion Module 2 Pwm With Max 20v For Ramps1.4 Board - 3d Printer Parts & Accessories - AliExpress
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Max 20v 3d Printer Part Ramps 1.4 Rrd Fan Extender Expansion Module For 3d Printer New Arrival - Pc Hardware Cables & Adapters - AliExpress
Reprap Ramps1.4 RRD Fan Extender - Geeetech Wiki
![SainSmart 2-in-1 3D Printer Controller Board for RepRap Arduino Betterthan RAMPS - [[:Template:SainSmart Wiki]]](http://wiki.sainsmart.com/images/1/1d/Ramps2in1.png "SainSmart 2-in-1 3D Printer Controller Board for RepRap Arduino Betterthan RAMPS - [[:Template:SainSmart Wiki]]")