This is a simple fan shroud for the E3D Hotend. It uses a friction fit on the top of the hotend heatsink to stay in place. The design attempts to increase air flow to the to the bottom of the heatsink. The photos show the design printed in polycarbonate, you can see a video of it printing here: http://youtu.be/-ChhTl4SCdI I also created a version which would work as a two piece with fans on both sides and held togheter with long screws. This would work with the fans in a push/pull configuration to provide even better air flow. This variant has not yet been tested.