20/24 Port siren add-on for Lasko 18" pedestal fans

thingiverse

This is a 20/24 port siren add-on for Lasko 18 inch pedestal fans. It will fit on any Lasko fan with the depicted motor style, but it is designed for the more powerful motor in the 18 inch models. Demonstration with Type 1 rotor: https://youtu.be/_PWcCMiIHcA?si=Xi0iG26U8u8EEpsrI've included two rotor types, Type 1 being modeled after the Federal Signal 500-SHTT, and Type 2 being modeled after the 10/12 port B&N Mobil Directo. I will say that the Type 2 rotor is easier to print as there are less supports to remove. The target rotor mass/weight (without supports) is 290 - 300 grams. Print the rotor with around 65 % infill or whichever results in the target mass/weight. Ideally, print the stator with 75 - 100 % infill, but feel free to go lower. Print with a support infill density of 5%.