Cooling duct for the right extruder for the FlashForge Dreamer (and other printers using the same left side blower configuration on a dual extruder). Stock duct primarily cools the left extruder and as a result the right extruder can suffer when printing PLA. This modification is designed to direct air to the right extruder and improve printing performance. Not to be used when printing with the left extruder for PLA (swap back to the stock duct). I originally designed this mod to cool both extruders, however with the stock blower fan, splitting the cooling resulted in a reduction of quality due to a lack of air flow to each extruder. Recommended to print out of ABS to prevent melting of the duct. 3 Files. RB-C0100-1 Is the complete part. RB-C0101-1 is the main housing only and RB-C0102-1 Is the insert which seats into the blower. I separated these two parts to eliminate the requirement for messy supports. Simply glue together RB-C0101-1 and RB-C0102-1.