With this mod you will be able to use any J-Head extruder with your BCN3D+ by BCN3D Technologies.
you will need to fit the fan to your specific hotend, here some options: 1, 2, 3, 4, 5
my hotend is 5mm longer (compared to the original BCNozzle) so the layer fan got too high. I lowered it by increasing the height of the layer fan holder: here you find the original one in case you have a different height.