How about laminating some thick bits of cardboard together to form a curve?
10 layers of that thick grey cardboard on the back of notepads or maybe mounting board glued together. If torus profile needed, the top could be cut roughly to shape in thinner strips before gluing and then sanded afterwards.
How about laminating some thick bits of cardboard together to form a curve?
10 layers of that thick grey cardboard on the back of notepads or maybe mounting board glued together. If torus profile needed, the top could be cut roughly to shape in thinner strips before gluing and then sanded afterwards.