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![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]]")
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Ramps 1.4 + Bl Touch + Fan extender = 4 Months of confusion. Pls help : r/3Dprinting
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Ramps 1.4 d2 pins for12v extruder fan, polarity?
