Active Servo-Driven Louver Casing for 120mm Fan
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Automated louver vent casing for 120mm fans. Uses an MG90s servo and bearing linkages for smooth, active airflow control
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Upgrade your ventilation setup with this custom 120mm fan casing featuring active, servo-driven louvers. Designed to dynamically direct or block airflow, the louver angles are controlled by a standard MG90s micro servo. The assembly replaces standard friction hinges with metal rods and bearings, ensuring a smooth, low-resistance mechanical movement that won't strain the servo.
This is highly effective for temperature-controlled 3D printer enclosures, DIY smart home exhaust vents, or custom microcontroller projects needing automated airflow restriction.
Bill of Materials (BOM)
1x MG90s Micro Servo
10x Bearings (2x5x2.5mm)
5x Stainless Steel Rods (125mm length, 2mm diameter)
4x M1x5mm Screws (for servo linkage mounting)
4x M3 Screws (for mounting the 120mm fan)
Print Instructions
Material: PETG or ASA is highly recommended if the fan will handle warm exhaust air from an enclosure. PLA is sufficient for cool ambient air.
Supports: Standard supports are required for the fan mounting overhangs.
Infill: 15–20% Gyroid or Honeycomb for structural rigidity.
Assembly Notes
Louver Sub-Assembly: Assemble the louvers completely first by combining the louver blades, gears, bearings, and stainless steel rods into a single mechanism.
Lower Casing Placement: Place the complete louver mechanism into the lower part of the casing.
Gear Alignment & Position Check: Verify that all gears are in their correct positions and properly aligned/meshed, then set all louvers to the fully closed position.
Enclose: Fit the top part of the casing over the lower assembly to capture and secure all components in place.
Servo Calibration: Mount the MG90s servo and connect the linkage using M1 screws. Verify your open and closed travel limits via your firmware controller before fully securing the servo horn.