Custom 3D printing and additive manufacturing using 3D printing techniques for others; treatment of materials for others, namely, surface treatment of metal, wood, stone, steel, metal, polymer, plastic; polishing metal and polymer objects made in the 3D printing process; treatment of materials, namely, object surface smoothing and dust recycling; treatment of materials, namely, smoothing, sandblasting, polishing and surface unification of manufactured goods for others; custom production of in...