A small blower fan that can be fitted to ordinary four-wheel-drive race cars with a 15x20mm motor, or a cylindrical 24mm motor. The fan blades are 90mm thick with a 2mm thickness, and the casing is 100mm thick with a 3mm thickness. I also printed one myself, and the wind power it generates is quite strong. If you have any questions, feel free to share and communicate for improvement.