This is a simple cooling nozzle that uses compressed air to quickly chill a print.
I was having some problems printing up a cube gear as well as some beveled gears and some folks suggested the cooling would help minimize curling on the fine details so I put together a simple setup that uses my shop compressed air.
The tube is 1/8" Stainless Steel and is connected to a regulator and a needle valve by flexible tubing.
The mount snuggles in between the bottom of the Z-Carriage and the metal plate that holds the Mk7 extruder and is held in place by a 4-40 screw.
First print the mount, and tap the #4-40 hole.
Bend and trim the tubing
Slide the tube into the hole in the mount - it's almost a press fit