Using a Rev F6 Printrboard for Dual Extruder

If a user wants to replace their printrboard on an older dual-extruder machine they can indeed do so.  Here are the requirements:
 
Firmware:
  • Must use this or any older F4/5 compatible version.  Dual extrusion is not compatible with current LED-capable firmware, which will not even read temperature of the 2nd or 3rd hot ends.
Hardware:
  • Only channel "B" works. Channel "B" corresponds to hot end #3, so users should slice their models to use hot end #3 for their 2nd material.
  • Both thermistor connections must have a thermistor connected.
 
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