Designer Materials can push the mechanical, chemical, and physical boundaries of matter. If the object includes designer matter its performance will likely be exceptional.
Really good computational chemistry combined with Fabbers has made production of designer materials common and inexpensive. If you have the money and time, it is often possible to describe what requirements a material is supposed to fulfill, and then produce that material at home Industrial scale production of carbon nanotubes, graphene, and metallic hydrogen are still expensive, but also totally worth it. AI modelling of physical, chemical, and biological systems is so good that it's often possible for a person to dream up a substance with specific properties in the morning and have it delivered that night. For a price, of course.