Velocity stack, 40mm
thingiverse
This streamlined velocity stack features a minimalist design with a single fin to support the center cone, allowing maximum swirl of turbulent air as it passes through. The gentle curve of the outside lip and cone gradually reduces the cross-sectional volume down to the width of the actual fan blades, optimizing airflow. Anecdotal evidence suggests that adding this velocity stack results in increased fan output and reduced noise levels, a welcome improvement for any 3D printer owner. To attach this part, M3 screws are required; be sure to measure the thickness of your fan mounting surface carefully to avoid over-tightening or damaging the outside. For those interested in upgrading their fan setup further, you may want to explore my other related listings: a velocity stack designed for 5015 blower fans and a compact fan duct with a 40mm diameter and 65-degree angle.
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