Single-crystal graphene is the leading candidate material. I guess we just need a continuous graphene-making builder robot. If it were me, I would arrange a d

Single-crystal graphene is the leading candidate material. I guess we just need a continuous graphene-making builder robot. If it were me, I would arrange a dozen or so ribbons in a circular configuration for redundancy with a platform climber made mostly from carbon fiber and covered in multilayer insulation.