V3 Fang 40mmx40mm Duct

This is a remix of the CR-10 FANG OEM fan duct assembly created by ozfunghi. This allows 40mm fan for hot end and extruder end. For the other pieces to this thing visit https://www.thingiverse.com/thing:2763931/. Ozfunghi has made a sturdy CR-10 FANG assembly which fits this.