Velocity Stack and Fan Guard for 40mm Fan (flat side)

thingiverse

This is a high-performance velocity stack for a 40mm fan (recommended 40x20mm). Designed to work seamlessly with fans featuring a 21mm diameter hub/motor. When paired with the right duct and fan combo, this velocity stack will significantly boost airflow through a duct system while protecting the fan from damage caused by foreign objects. I strive to create all my designs with elegance, efficiency, and effectiveness in mind - The 3Es! Your feedback is always valuable and welcome. The unique design features of this velocity stack set it apart from others: Small holes are strategically placed around the bottom to precisely control and boost airflow (boundary layer control). The perfectly sized holes and design enable the use of 3mm socket head bolts. This velocity stack is designed to be printed without support or brims. One flat side allows for compatibility with "adriansm" based designs like http://www.thingiverse.com/thing:1964762 and http://www.thingiverse.com/thing:2186235. Other velocity stacks are not compatible with this type of duct system. A normal round version is also available at http://www.thingiverse.com/thing:2211780. Be sure to check out my other designs! Print Settings Printer: Any Rafts: No Supports: No Resolution: 0.2 - 0.25mm layers Infill: 25-35% Notes: Make sides, tops, and bottoms at least 0.8-1.2mm thick. I designed this velocity stack from scratch using Rhino 5, drawing on extensive knowledge of aerodynamics and aircraft design.