60MM Easy to print in place Fan Vent!
This is deigned to go on the inlet or outlet of a fan, the blades will move inwards or outwards when the fan turns on.
Blades move super easily; - Gravity resets them to the "sealed position"
Perfect for providing draft protection when vent fans are turned off. (such as when printing PC ABS or Nylon in a vented enclosure)
Move the fins by hand a few times to free them; They should be relatively loose straight off the bed though.