detachable cooling module 3d model

Create a realistic 3D model of a detachable mechanical cooling module for a laptop stand. Include a square fan housing with a circular fan inside and visible airflow vents. Add a gear system with one large gear and one small gear connected to the fan to increase RPM mechanically. Include a separate foot pedal connected by a string-pull or linkage mechanism. The pedal should use a simple hinged lever design similar to a sewing machine pedal and look realistic for 3D printing. The design should appear durable, functional, compact, and mechanically believable with clean industrial styling, rounded edges, and realistic proportions. No electronics, wires, motors, or futuristic elements. White background.