About This File
I was dealing with serious jamming in the hotend every print.
On my research I noticed almost every picture of the V6 hotend shows a fan shroud that forces the air to get pushed trough the cooling fins.
It seems not necessary on the Voron design because there is not a lot of space where the air can go, but rememeber: air is like any other fluid, getting forced it always wants to get the way wich has less resistance and in this case it is beside the cooler and nothing of them will go inside the cooling fins. especialy that tiny amount of air from an 30mm fan.
For me it works well, getting rid of the jamming by this little mod 
+ getting sure you have added thermal compound paste on heatbreak/cooler