Risking a nerd singularity, Thingiverse user Thaed (who provides D&D stats in his profile) designed and printed this beanie for his dog, Bella.
What self-respecting nerd wouldn’t have one of these things lying around? Originally, I wanted it to be solar powered, but I had to settle for AAA batteries. I scavenged the motor and propeller from a 6 in 1 educational solar kit. There’s no reason why you can’t print your own propeller and use a motor from a cd player or really any motor.
