This is a custom made layer cooling fan mount and duct specifically made for this bowden carriage but it's original model should work with it too (untested). It is designed to basically just clip on to the carriage from the rear end. This model supports a 50mm fan you can get off amazon for pretty cheap. Note that you may need to extend the Y endstop (literally just attach some cardstock or plastic thin enought to fit in the optical endstop to the Y carriage endstop flag) a little if your fan hits the rear Y-axis rotating rod when homing. You may have to adjust the hotend height in the carriage to get the best airflow if using the first carriage. Fusion 3D file provided. One more thing, you may need to add custom starting gcode to your prints to move the extruder about 80mm out of home Y position to ensure the fan doesn't clip anything on its way to start a print. If you have any questions about how to do anything above, just comment or pm me. With this fan mount, I am now fully set with a bowden DaVinci 1.0 (Wades Extruder, E3D v6, the carriage and fan mount)! NOTE: Only tested on the v1 of the first carriage, but should work on the v2 as well.
XYZ DaVinci 1.0 w/E3D v6 + Bowden
You will most likely need supports touching bed. Any resolution should be sufficient at or below 0.3. I printed mine with 20% fill and it is holding up great. I printed mine without active cooling and it came out ok. Printing with active cooling would help it alot, and MAY actually not need supports.
To remove the supports, I just ripped out the material with needle nosed pliers.