So, summer's here. Let's print out a pinwheel, and use thermoforming to get the pinwheel into the right shape! All you'll need is a little bit of hot water to get the plastic to soften, so you can fold the pinwheel into shape.
Designed in Tinkercad, a video showing both the design process and assembly process is available here.
Print it in a variety of colors to suit your taste.