This is a full effector replacement for the FLSUN SR with 5015 Fans. It's provided as one part, but you can split the effector model at 6mm and print it as two parts and screw them together. You need supports for the central flat area where the heatsink mounts to it. NOTES: Depending on what kind of heatsink/heatblock/heatbreak you have, you may need to modify or tweak the height of the Fanducts. The provided ones are designed with a fully genuine E3D Volcano (heatsink/heatblock/heatbreak/nozzle) and bi-metallic heatbreak.