This is a duct I designed for a 25mm fan for the heatsink on the extruder:
Mounts in the original place using the original blower screw. Tucks nicely out of the way.
I think that the TAZ 6 has a similar heatsink blower, but uses a much bulkier 30mm (or 40mm) fan.
This 25mm muffin fan and duct arrangement completely cured our PLA filament jamming/grinding problems. Glow-in-the-dark PLA and metal-filled PLA are no longer a problem.