Cloudscape

With enough energy, nanorobots connected to a nanoscale knife could cut through almost anything because in their small size they would meet little resistance. Of course, the effects of this would normally be unnoticeable macroscopically, but suppose that as the nanorobots would cut through the material they would secrete a kind of lubricant, this would allow the microscopic slit to become larger as the parts of the material could slide off one another. For some materials, another method could be to heat it, so that part of it melts or vaporizes so as to lubricate it itself. If the material would be a metal, the nanorobots could instead use magnetism instead of a lubricant to repel the metal.