This is a replacement for the part called "tobera" on the original bq i3 hephestos. I designed it to guide the cooling air around the nozzle to cool the object from all sides as the standard part only guides cool air to one side of the object.
You have to print this in ABS as it is way to close to the hot end for a part made of PLA.
V4 Version did not work! New version V5 fixes a problem inside the thing partly blocking air flow.