TAZ Circular fan duct
thingiverse
UPDATE: Please avoid using this as it has been replaced by a more efficient non-circular duct (thing:147966). The initial fan duct design had three major drawbacks - it occupied a large amount of space on both X and Y axes, potentially damaging the printer's corners if limit adjustments were neglected; the circular part tended to sag over time, disrupting the print quality; and the low height of the fan holder was prone to colliding with prints. This Lulzbot TAZ mountable fan duct aimed to enhance PLA print quality but encountered several issues. It required 4 heat set nuts and 6 m3 bolts for assembly.
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