Summary The heat-sink fan on the E3D V6 draws in air from all directions. This can lead to localised cooling of the print and Heated Bed. The is especially noticeable when printing at high temperatures. This fan shroud ensures air is drawn from areas away from the Bed and HotEnd thus helping to ensure higher quality and warp-free prints. This is designed for the 30x30x10 Heat-Sink Fan and works with the original fixings. EDIT | Fixed STL Print Settings Printer: BigBox Rafts: No Supports: Yes Resolution: 0.25mm Infill: 20% Notes: Print with a 0.4mm Nozzle in your favourite high-Tg thermoplastic. I recommend a small section of support to help with the print overhang.