4 model

Free

Anycubic MEGA S Fan Duct Remix [UPDATED]

Thingiverse

Free

Wanhao i3 v2.1 CiiiCooler adapter/Ultimate X Belt Tensioner combo

Thingiverse

Free

Blue Painter's Tape / Duct Tape | Filament Swatch

Thingiverse

Free

Easythreed/Labists X1 blower fan duct 5015 ( cable tie or double-sided tape )

Thingiverse