I think a stainless steel reaction wheel is unlikely to break. Now those 3D printed reaction wheels using ball bearing balls for weight are another story: https

I think a stainless steel reaction wheel is unlikely to break. Now those 3D printed reaction wheels using ball bearing balls for weight are another story: https://www.youtube.com/watch?v=AJQZFHJzwt4 https://www.youtube.com/watch?v=AJQZFHJzwt4