I own a CTC Dual 3d printer and do not use the second extruder for more than to do some first tests, the second extruder and and the extra wires only cause troubles when maintenance and unnecesary mass to move causing more vibrations and lower quality prints.
...So i decide to remove my second extruder and use the extra carriage space for adding an active cooling system for better results, mainly when ABS small parts or PLA parts are produced.
For BOM and assembling instructions please check: http://3dpdesigns.blogspot.com.es/p/flashforge.html
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