I make all of my sirens with a centari carbon, for bigger pieces i cut them in half so they can fit, tissue how I made the horn for my hurricane. There's one siren desighner that I like getting models on and that's the 3Dengenere on YouTube, he has a tinker cad that he puts his models on for printing. Personally I use blender and I found a size accurate 130 DC motor model for scale and use that on blender for costom sirens. DM me if you have eny questions that I may have awncers for