5 model

Free

Annular Cooling for Ultimaker V2

Thingiverse

Free

Annular Cooling for Ultimaker

Thingiverse

Free

Annular Cooling for Prusa using 80mm fan

Thingiverse

Free

Hybrid annular fan duct

Thingiverse

Free

Parametric Annular Fan duct for centrifugal blowers

Thingiverse