Fins inside shroud direct cooling air to nozzle. Heat block is coated with high-temp silicone rubber to insulate and protect the shroud from heat. Also, the hotend cooling fan is installed to draw air out instead of blowing it into the heat-sink. Much more effective cooling this way. All parts were printed in PLA. Blower for print cooling is 40 x 40 x 20 mm centrifugal type. The bracket fits regular Kossel Mini end effectors. SCAD file is included for your customization. Hotend CAD mockup http://www.thingiverse.com/thing:341689 Thanks lXGaimMasterXl !!