This is an updated version of the previous one I created which had too small of an opening, and too direct onto the nozzle. In addition the previous version had about 1mm tolerance off which caused it to dip a little bit touching the build plate slightly. This is bad. Even though performance of it was decent. This new version is Much tighter tolerances. Hovers just over the buildplate, rock solid, bigger airflow nozzle pointed more downwards. (and to the other side as well) Works with STOCK ultimakers, doesn't interfere with blocks, uses all standard parts. V2 hothead.Simply print without supports. No special instructions. Use standard ultimaker bolts to bolt fan onto shroud (you only need 2) slide shroud onto the long bolts it should fit snuggly. Use standard nuts to fasten onto long bolts Check to see that it doesn't hit your print bed when zeroed.