This is a duct for cooling your TAZ PLA prints. It is designed to mount directly onto the extruder housing. It requires 4 heat set nuts and 6 m3 bolts.
This is an evolution from my previous TAZ Circular Fan Duct. The Circular duct was less useful than it was worth, so I've switched over to just a traditional fan. Unlike the previous duct, you shouldn't need to adjust your X and Y settings and won't knock into the print. Unlike other TAZ ducts I've seen, this one is several layers thick, so it is much easier to print airtight versions.