Part Cooling Fan (Fixed)

The original part cooling fan designed by wryanddry only blows air at the base of the nozzle near the heater block, not at the tip of the nozzle. It also makes direct contact with the silicone sock and becomes melted.

These are 2 versions extended by 2.3mm to work with the silicone sock and the stock hotend. And a +5mm version which might work with some extended nozzles.

I also added a bump to restruct airflow on one side, because the part was only getting about 5% of its airflow to the hole farthest from the fan. Likely the flow dynamics need to be changed entirely, but I dont need much part cooling.

I think the passageway to the far hole is too small, and this would benefit from making the plenum about 3x bigger.