Here is how I print a propeller for my mixer. I have already drawn it using Fusion 360. The process involved choosing Make -> 3D Print, then selecting the propeller and clicking OK. This hands it off to Simplify 3D, the software that actually runs the printer. Within Simplify 3D I can position it on the bed and move a slider to animate how the printing will be done, layer-by-layer. Finally, after making sure it is connected to the printer, I click to initiate. That begins the process of preheating the printing bed and head, which takes about 5 minutes. After that, the actual printing takes about 10 minutes.
In ceramic studios, labs and classrooms, a good propeller mixer is essential for mixing glaze and body slurries.